Journal of Microbiology

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Mucilaginibacter florum sp. nov., isolated from the flower of Coreopsis grandiflora and Mucilaginibacter oryzagri sp. nov., isolated from rice paddy soil in Korea: Parthiban Subramanian, Jun Heo, Daseul Lee, Seunghwan Kim, Hyorim Choi, Yunhee Choi, Yiseul Kim; J. Microbiol. 2025;63(12):e2509014. Published online December 31, 2025; DOI: https://doi.org/10.71150/jm.2509014

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Abstract PDF Supplementary Material: Two aerobic, Gram-stain-negative, non-motile and rod-shaped bacterial strains designated GGG-R5^T and M4-18^T were isolated from flowers of golden wave (Coreopsis grandiflora) and rice paddy soil, respectively in the Republic of Korea. Both strains were pigmented and produced flexirubin-type pigments. Based on phylogenetic analysis using 16S rRNA gene sequence, both strains were placed within the genus Mucilaginibacter with M. agri R11^T and M. jinjuensis YC7004^T both being the closest relatives to GGG-R5^T (97.7%) and in case of M4-18^T, M. ginsenosidivorax KHI28^T (98.5%) was the nearest neighbor. Characteristic to genus Mucilaginibacter, the major cellular fatty acids in both strains were iso-C_15:0, iso-C_{17:0 3-OH}, summed feature 3 (C_16:1 ω7c and/or C_16:1 ω6c); menaquinone-7 was the major menaquinone and phosphatidylethanolamine was the major polar lipid observed. Comparison of genome sequences with the other members of Mucilaginibacter indicated orthologous average nucleotide identity (orthoANI) at 73.3–73.5% for GGG-R5^T and 78.9–88.5% for M4-18^T. Digital DNA-DNA hybridization (dDDH) values ranged at 19.1–19.7% between GGG-R5^T and its neighbor species. In case of M4-18^T, the observed range was at 21.9–36.6%. Considering the 16S rRNA similarity, orthoANI and dDDH values as well as comparison of phenotypic and chemotaxonomic characteristics indicated that both strains belonged to genus Mucilaginibacter but were distinctly distinguishable from previously described species. The strains GGG-R5^T and M4-18^T, therefore represent distinct novel species for which names Mucilaginibacter florum GGG-R5^T and Mucilaginibacter oryzagri M4-18^T are proposed. The type strains are GGG-R5^T (= KACC 22063^T = JCM 36590^T) and M4-18^T (= KACC 22773^T = JCM 35894^T).

Rubrivirga aquatilis sp. nov. and Rubrivirga halophila sp. nov., isolated from Korean coastal surface seawater: Jisoo Han, Yeonjung Lim, Mirae Kim, Jang-Cheon Cho; J. Microbiol. 2025;63(8):e2504017. Published online August 13, 2025; DOI: https://doi.org/10.71150/jm.2504017

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Abstract PDF Supplementary Material: Two Gram-stain-negative, obligately aerobic, non-motile, short rod-shaped bacteria, designated IMCC43871^T and IMCC45206^T, were isolated from coastal surface seawater collected from the Yellow Sea and the South Sea of Korea, respectively. The two strains shared 99.2% 16S rRNA gene sequence similarity with each other and exhibited ≤ 98.4% similarity to three described Rubrivirga species. Average nucleotide identity (ANI) and digital DNA–DNA hybridization (dDDH) values between IMCC43871^T and IMCC45206^T were 88.5% and 36.3%, respectively, confirming that they represent two distinct species. Their ANI (≤ 77.7%) and dDDH (≤ 21.4%) values relative to the type strains of the genus Rubrivirga further supported the recognition of strains IMCC43871^T and IMCC45206^T as two novel species within the genus. The complete genomes of IMCC43871^T (4.17 Mb, 71.8% G + C content) and IMCC45206^T (4.17 Mb, 72.8% G + C content) fall within the known genomic range of the genus. Cellular fatty acid, quinone, and polar lipid profiles were consistent with the chemotaxonomic features of the genus Rubrivirga, supporting their affiliation with the genus. Based on phylogenetic, genomic, and phenotypic evidence, strains IMCC43871^T and IMCC45206^T are proposed as two novel species, Rubrivirga aquatilis sp. nov. and Rubrivirga halophila sp. nov., respectively. The type strains are IMCC43871^T (= KCTC 102072^T = NBRC 116463^T) and IMCC45206^T (= KCTC 92925^T = NBRC 116172^T = CCTCC AB 2023136^T).

Journal Articles

Leuconostoc aquikimchii sp. nov., a Lactic Acid Bacterium Isolated from Cabbage Watery Kimchi: Subin Kim, Se Hee Lee, Ki Hyun Kim, Misun Yun; J. Microbiol. 2024;62(12):1089-1097. Published online December 2, 2024; DOI: https://doi.org/10.1007/s12275-024-00188-z

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Two Gram-stain-positive, facultatively anaerobic, non-hemolytic, coccoid-shaped bacterial strains, designated MS01(T) and MS02, were isolated from cabbage watery kimchi in the Republic of Korea. Cellular growth occurred at 5-25 ℃ (optimum, 20 ℃), pH 5-8 (optimum, pH 7) and in the presence of 0-5% (w/v) NaCl (optimum, 1%). Results of 16S rRNA gene-based phylogenetic analyses showed that strains MS01(T) and MS02 shared identical sequences, clustered within the Leuconostoc clade in phylogenetic trees, and were most closely related to Leuconostoc inhae IH003(T) and Leuconostoc gasicomitatum LMG 18811(T) with sequence similarities of 98.74%. The complete whole-genome sequences of strains MS01(T) and MS02 measured 2.04-2.06 Mbp and harbored a 50.6 kb plasmid, with DNA G + C contents of 37.7% for both. Based on average nucleotide identities (ANI) and digital DNA-DNA hybridization (dDDH) values, both strains were confirmed to belong to the same species but showed ≤ 85.9% ANI and ≤ 29.9% dDDH values to other Leuconostoc species, indicating that they represent a novel species. Metabolic pathway reconstruction revealed that both strains perform heterolactic acid fermentation, producing lactate, acetate, and ethanol. Chemotaxonomic analyses, including cellular fatty acids, polar lipids, and peptidoglycan amino acid, confirmed the inclusion of both strains within the genus Leuconostoc. Based on the phylogenetic, genomic, and phenotypic characterization, strains MS01(T) and MS02 were considered to represent a novel species within the genus Leuconostoc, for which the name Leuconostoc aquikimchii sp. nov. is proposed with MS01(T) (= KACC 23748(T) = JCM 37028(T)) as the type strain.

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Validation List no. 224. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2025;[Epub] CrossRef

Congregibacter variabilis sp. nov. and Congregibacter brevis sp. nov. within the OM60/NOR5 Clade, Isolated from Seawater, and Emended Description of the Genus Congregibacter: Hyeonsu Tak, Miri S Park, Hyerim Cho, Yeonjung Lim, Jang-Cheon Cho; J. Microbiol. 2024;62(9):739-748. Published online July 18, 2024; DOI: https://doi.org/10.1007/s12275-024-00158-5

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Two Gram-stain-negative, aerobic, motile by means of flagella, short rod-shaped bacterial strains, designated IMCC43200(T) and IMCC45268(T), were isolated from coastal seawater samples collected from the South Sea of Korea. Strains IMCC43200(T) and IMCC45268(T) shared 98.6% 16S rRNA gene sequence similarity and were closely related to Congregibacter litoralis KT71(T) (98.8% and 98.7%, respectively). Complete whole-genome sequences of IMCC43200(T) and IMCC45268(T) were 3.93 and 3.86 Mb in size with DNA G + C contents of 54.8% and 54.2%, respectively. Average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values between the two strains were 74.5% and 23.4%, respectively, revealing that they are independent species. The two strains showed ANI values of ≤ 75.8% and dDDH values of ≤ 23.0% to the type and only species of the genus Congregibacter (C. litoralis), indicating that each strain represents a novel species. Both strains contained summed feature 3 (comprising C(16:1) ω6c and/or C(16:1) ω7c) and summed feature 8 (comprising C(18:1) ω6c and/or C(18:1) ω7c) as major fatty acid constituents. The predominant isoprenoid quinone detected in both strains was ubiquinone-8 (Q-8). The major polar lipids of the two strains were phosphatidylethanolamine, phosphatidylglycerol, phospholipids, and aminolipids. Based on the phylogenetic, genomic, and phenotypic characterization, strains IMCC43200(T) and IMCC45268(T) were considered to represent two novel species within the genus Congregibacter, for which the names Congregibacter variabilis sp. nov. and Congregibacter brevis sp. nov. are proposed with IMCC43200(T) (= KCTC 8133(T) = NBRC 116295(T) = CCTCC AB 2023139(T)) and IMCC45268(T) (= KCTC 92921(T) = NBRC 116135(T)) as the type strains, respectively.

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Validation List no. 223. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2025;[Epub] CrossRef
Phycobium rhodophyticola gen. nov., sp. nov. and Aliiphycobium algicola gen. nov., sp. nov., isolated from the phycosphere of marine red algae
Jeong Min Kim, Woonhee Baek, Byeong Jun Choi, Hülya Bayburt, Jae Kyeong Lee, Sung Chul Lee, Che Ok Jeon
Journal of Microbiology.2025; 63(6): e2503014. CrossRef
Notification of changes in taxonomic opinion previously published outside the IJSEM. List of Changes in Taxonomic Opinion no. 42
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2025;[Epub] CrossRef
Rubrivirga aquatilis sp. nov. and Rubrivirga halophila sp. nov., isolated from Korean coastal surface seawater
Jisoo Han, Yeonjung Lim, Mirae Kim, Jang-Cheon Cho
Journal of Microbiology.2025; 63(8): e2504017. CrossRef
Leuconostoc aquikimchii sp. nov., a Lactic Acid Bacterium Isolated from Cabbage Watery Kimchi
Subin Kim, Se Hee Lee, Ki Hyun Kim, Misun Yun
Journal of Microbiology.2024; 62(12): 1089. CrossRef

Review

Structural Insights into the Lipopolysaccharide Transport (Lpt) System as a Novel Antibiotic Target: Yurim Yoon, Saemee Song; J. Microbiol. 2024;62(4):261-275. Published online May 31, 2024; DOI: https://doi.org/10.1007/s12275-024-00137-w

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Lipopolysaccharide (LPS) is a critical component of the extracellular leaflet within the bacterial outer membrane, forming an effective physical barrier against environmental threats in Gram-negative bacteria. After LPS is synthesized and matured in the bacterial cytoplasm and the inner membrane (IM), LPS is inserted into the outer membrane (OM) through the ATP-driven LPS transport (Lpt) pathway, which is an energy-intensive process. A trans-envelope complex that contains seven Lpt proteins (LptA-LptG) is crucial for extracting LPS from the IM and transporting it across the periplasm to the OM. The last step in LPS transport involves the mediation of the LptDE complex, facilitating the insertion of LPS into the outer leaflet of the OM. As the Lpt system plays an essential role in maintaining the impermeability of the OM via LPS decoration, the interactions between these interconnected subunits, which are meticulously regulated, may be potential targets for the development of new antibiotics to combat multidrug-resistant Gram-negative bacteria. In this review, we aimed to provide an overview of current research concerning the structural interactions within the Lpt system and their implications to clarify the function and regulation of LPS transport in the overall process of OM biogenesis. Additionally, we explored studies on the development of therapeutic inhibitors of LPS transport, the factors that limit success, and future prospects.

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Antibiotic Resistance in Klebsiella pneumoniae and Related Enterobacterales: Molecular Mechanisms, Mobile Elements, and Therapeutic Challenges
Veronika Zdarska, Gabriele Arcari, Milan Kolar, Patrik Mlynarcik
Antibiotics.2026; 15(1): 37. CrossRef
Boosting the Antimicrobial Activity of Quaternary Ammonium Photosensitizers by Janus‐Type AIE Luminogens
Dongyang Fan, Meng Li, Zipeng Shen, Ying Li, Jingjing Guo, Dong Wang, Ting Han, Ben Zhong Tang
Aggregate.2025;[Epub] CrossRef
Functional Versatility of Vibrio cholerae Outer Membrane Proteins
Annabelle Mathieu-Denoncourt, Marylise Duperthuy
Applied Microbiology.2025; 5(3): 64. CrossRef
Integrated Omics-Based Discovery of Bioactive Halogenated Metabolites from the Deep-Sea Streptomyces sp. B188M101
Emmanuel Tope Oluwabusola, Stephen A. Jackson, Cristina Brunati, Stefanie Gackstatter, Hannah Vedder, Marianna Iorio, Gargee Chawande, Lekha Menon Margassery, Giang-Son Nguyen, David J. Clarke, Rainer Ebel, Marcel Jaspars, Alan D. W. Dobson
Marine Drugs.2025; 23(9): 362. CrossRef
Protein–Protein Interactions as Promising Molecular Targets for Novel Antimicrobials Aimed at Gram-Negative Bacteria
Piotr Maj, Joanna Trylska
International Journal of Molecular Sciences.2025; 26(22): 10861. CrossRef

Journal Articles

Medium Chain Length Polyhydroxyalkanoate Production by Engineered Pseudomonas gessardii Using Acetate-formate as Carbon Sources: Woo Young Kim, Seung-Jin Kim, Hye-Rin Seo, Yoonyong Yang, Jong Seok Lee, Moonsuk Hur, Byoung-Hee Lee, Jong-Geol Kim, Min-Kyu Oh; J. Microbiol. 2024;62(7):569-579. Published online May 3, 2024; DOI: https://doi.org/10.1007/s12275-024-00136-x

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Production of medium chain length polyhydroxyalkanoate (mcl-PHA) was attempted using Pseudomonas gessardii NIBRBAC000509957, which was isolated from Sunchang, Jeollabuk-do, Republic of Korea (35°24'27.7"N, 127°09'13.0"E) and effectively utilized acetate and formate as carbon sources. We first evaluated the utilization of acetate as a carbon source, revealing optimal growth at 5 g/L acetate. Then, formate was supplied to the acetate minimal medium as a carbon source to enhance cell growth. After overexpressing the acetate and formate assimilation pathway enzymes, this strain grew at a significantly higher rate in the medium. As this strain naturally produces PHA, it was further engineered metabolically to enhance mcl-PHA production. The engineered strain produced 0.40 g/L of mcl-PHA with a biomass content of 30.43% in fed-batch fermentation. Overall, this strain can be further developed to convert acetate and formate into valuable products.

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Formate-driven photoautotrophic growth and biopolymer storage in anaerobic purple bacteria
Mohammad Adib Ghazali Abdul Rahman, Bronwyn Laycock, Steven Pratt, Damien J. Batstone
Bioresource Technology.2025; 434: 132753. CrossRef
Sulphide and oleic acid synergism in accelerating mcl-PHA biopolymer production in Pseudomonas aeruginosa MCC 5300 by modulating electron transport system
Raghavendra Paduvari, Divyashree Somashekara
Biochemistry and Biophysics Reports.2025; 44: 102286. CrossRef
Unlocking efficient polyhydroxyalkanoate production by Gram-positive Priestia megaterium using waste-derived feedstocks
Xinyi Bai, Libo Xu, Kang Li, Guangbao Zhang, Mengjun Zhang, Yi Huang
Microbial Cell Factories.2025;[Epub] CrossRef
Selective utilization of formic acid and acetic acid in succinic acid fermentation broth to produce single-cell protein using Rhodotorula glutinis
Fuqiang Liu, Pengfei Wu, Lin Yu, Zitu Lü, Xinying Sun, Jiaxin Li, Lei Liu, Jing Wu, Jianan Zhang
Bioprocess and Biosystems Engineering.2025;[Epub] CrossRef

Saxibacter everestensis gen. nov., sp. nov., A Novel Member of the Family Brevibacteriaceae, Isolated from the North Slope of Mount Everest: Mao Tian, Shiyu Wu, Wei Zhang, Gaosen Zhang, Xue Yu, Yujie Wu, Puchao Jia, Binglin Zhang, Tuo Chen, Guangxiu Liu; J. Microbiol. 2024;62(4):277-284. Published online March 6, 2024; DOI: https://doi.org/10.1007/s12275-024-00108-1

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Abstract PDF: We isolated and analyzed a novel, Gram-stain-positive, aerobic, rod-shaped, non-motile actinobacterium, designated as strain ZFBP1038(T), from rock sampled on the north slope of Mount Everest. The growth requirements of this strain were 10-37 °C, pH 4-10, and 0-6% (w/v) NaCl. The sole respiratory quinone was MK-9, and the major fatty acids were anteiso-C(15:0) and iso-C(17:0). Peptidoglycan containing meso-diaminopimelic acid, ribose, and glucose were the major cell wall sugars, while polar lipids included diphosphatidyl glycerol, phosphatidyl glycerol, an unidentified phospholipid, and an unidentified glycolipid. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain ZFBP1038(T) has the highest similarity with Spelaeicoccus albus DSM 26341( T) (96.02%). ZFBP1038(T) formed a distinct monophyletic clade within the family Brevibacteriaceae and was distantly related to the genus Spelaeicoccus. The G + C content of strain ZFBP1038(T) was 63.65 mol% and the genome size was 4.05 Mb. Digital DNA-DNA hybridization, average nucleotide identity, and average amino acid identity values between the genomes of strain ZFBP1038(T) and representative reference strains were 19.3-25.2, 68.0-71.0, and 52.8-60.1%, respectively. Phylogenetic, phenotypic, and chemotaxonomic characteristics as well as comparative genome analyses suggested that strain ZFBP1038(T) represents a novel species of a new genus, for which the name Saxibacter gen. nov., sp. nov. was assigned with the type strain Saxibacter everestensis ZFBP1038(T) (= EE 014( T) = GDMCC 1.3024( T) = JCM 35335( T)).

miR-135b Aggravates Fusobacterium nucleatum-Induced Cisplatin Resistance in Colorectal Cancer by Targeting KLF13: Wei Zeng , Jia Pan , Guannan Ye; J. Microbiol. 2024;62(2):63-73. Published online February 24, 2024; DOI: https://doi.org/10.1007/s12275-023-00100-1

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Cisplatin resistance is the main cause of colorectal cancer (CRC) treatment failure, and the cause has been reported to be related to Fusobacterium nucleatum (Fn) infection. In this study, we explored the role of Fn in regulating cisplatin resistance of CRC cells and its underlying mechanism involved. The mRNA and protein expressions were examined by qRT-PCR and western blot. Cell proliferation and cell apoptosis were assessed using CCK8 and flow cytometry assays, respectively. Dual-luciferase reporter gene assay was adopted to analyze the molecular interactions. Herein, our results revealed that Fn abundance and miR-135b expression were markedly elevated in CRC tissues, with a favorable association between the two. Moreover, Fn infection could increase miR-135b expression via a concentration-dependent manner, and it also enhanced cell proliferation but reduced apoptosis and cisplatin sensitivity by upregulating miR-135b. Moreover, KLF13 was proved as a downstream target of miR-135b, of which overexpression greatly diminished the promoting effect of miR-135b or Fn-mediated cisplatin resistance in CRC cells. In addition, it was observed that upstream 2.5 kb fragment of miR-135b promoter could be interacted by β-catenin/TCF4 complex, which was proved as an effector signaling of Fn. LF3, a blocker of β-catenin/TCF4 complex, was confirmed to diminish the promoting role of Fn on miR-135b expression. Thus, it could be concluded that Fn activated miR-135b expression through TCF4/β-catenin complex, thereby inhibiting KLF13 expression and promoting cisplatin resistance in CRC.

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miR-135b: A key role in cancer biology and therapeutic targets
Yingchun Shao, Shuangshuang Zhang, Yuxin Pan, Zhan Peng, Yinying Dong
Non-coding RNA Research.2025; 12: 67. CrossRef
miR‐135b: A Potential Biomarker for Pathological Diagnosis and Biological Therapy
Dezhi Yan, Qingliu He, Chunjian Wang, Tian Li, Xueping Yi, Haisheng Yu, Wenfei Wu, Hanyun Yang, Wenzhao Wang, Liang Ma
WIREs RNA.2025;[Epub] CrossRef
Effects of the Intestinal Microbiome and Metabolites on Neoadjuvant Chemotherapy Efficacy in Breast Cancer
Jingyue Fu, Hongxin Lin, Shuaikang Li, Xingying Yu, Yufan Jin, Jie Mei, Yichao Zhu, Tiansong Xia
BIO Integration.2025;[Epub] CrossRef
Fusobacterium nucleatum and non-coding RNAs: orchestrating oncogenic pathways in colorectal cancer
Zahra Sadeghloo, Sara Ebrahimi, Mojdeh Hakemi-Vala, Mehdi Totonchi, Amir Sadeghi, Nayeralsadat Fatemi
Gut Pathogens.2025;[Epub] CrossRef
Regulatory mechanisms and emerging diagnostic and therapeutic opportunities of non-coding RNAs in tumorigenesis: a pan-cancer perspective
Doblin Sandai, Zengkan Du, Haoling Zhang, Qi Sun
Critical Reviews in Clinical Laboratory Sciences.2025; : 1. CrossRef
Emerging roles of intratumor microbiota in cancer: tumorigenesis and management strategies
Zhuangzhuang Shi, Zhaoming Li, Mingzhi Zhang
Journal of Translational Medicine.2024;[Epub] CrossRef
Fusobacterium nucleatum: a novel regulator of antitumor immune checkpoint blockade therapy in colorectal cancer
Mengjie Luo
American Journal of Cancer Research.2024; 14(8): 3962. CrossRef
Antioxidant Role of Probiotics in Inflammation-Induced Colorectal Cancer
Sevag Hamamah, Andrei Lobiuc, Mihai Covasa
International Journal of Molecular Sciences.2024; 25(16): 9026. CrossRef
Identification of Penexanthone A as a Novel Chemosensitizer to Induce Ferroptosis by Targeting Nrf2 in Human Colorectal Cancer Cells
Genshi Zhao, Yanying Liu, Xia Wei, Chunxia Yang, Junfei Lu, Shihuan Yan, Xiaolin Ma, Xue Cheng, Zhengliang You, Yue Ding, Hongwei Guo, Zhiheng Su, Shangping Xing, Dan Zhu
Marine Drugs.2024; 22(8): 357. CrossRef

Structural and Functional Analyses of the Flavoprotein Disulfide Reductase FN0820 of Fusobacterium nucleatum: Hyunwoo Shin , Yeongjin Baek , Dukwon Lee , Yongbin Xu , Yonghoon Kwon , Inseong Jo , Nam-Chul Ha; J. Microbiol. 2023;61(12):1033-1041. Published online December 20, 2023; DOI: https://doi.org/10.1007/s12275-023-00095-9

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Escherichia coli RclA and Staphylococcus aureus MerA are part of the Group I flavoprotein disulfide reductase (FDR) family and have been implicated in the contribution to bacterial pathogenesis by defending against the host immune response. Fusobacterium nucleatum is a pathogenic, anaerobic Gram-negative bacterial species commonly found in the human oral cavity and gastrointestinal tract. In this study, we discovered that the F. nucleatum protein FN0820, belonging to the Group I FDR family, exhibited a higher activity of a Cu2+- dependent NADH oxidase than E. coli RclA. Moreover, FN0820 decreased the dissolved oxygen level in the solution with higher NADH oxidase activity. We found that L-tryptophan and its analog 5-hydroxytryptophan inhibit the FN0820 activities of NADH oxidase and the concomitant reduction of oxygen. Our results have implications for developing new treatment strategies against pathogens that defend the host immune response with Group I FDRs.

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The role of metals in hypothiocyanite resistance in Escherichia coli
Michael J. Gray, Laurie E. Comstock
Journal of Bacteriology.2024;[Epub] CrossRef

Comparison of Ganoderma boninense Isolate’s Aggressiveness Using Infected Oil Palm Seedlings: Mei Lieng Lo , Tu Anh Vu Thanh , Frazer Midot , Sharon Yu Ling Lau , Wei Chee Wong , Hun Jiat Tung , Mui Sie Jee , Mei-Yee Chin , Lulie Melling; J. Microbiol. 2023;61(4):449-459. Published online April 25, 2023; DOI: https://doi.org/10.1007/s12275-023-00040-w

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Basal stem rot incidence caused by a white-rot fungus, Ganoderma boninense, is the major disease of oil palm in Southeast Asia. The rate of disease transmission and host damage are affected by variations in pathogen aggressiveness. Several other studies have used the disease severity index (DSI) to determine G. boninense aggressiveness levels while verifying disease using a culture-based method, which might not provide accurate results or be feasible in all cases. To differentiate G. boninense aggressiveness, we employed the DSI and vegetative growth measurement of infected oil palm seedlings. Disease confirmation was performed through scanning electron microscopy and molecular identification of fungal DNA from both infected tissue and fungi isolated from Ganoderma selective medium. Two-month-old oil palm seedlings were artificially inoculated with G. boninense isolates (2, 4A, 5A, 5B, and 7A) sampled from Miri (Lambir) and Mukah (Sungai Meris and Sungai Liuk), Sarawak. The isolates were categorized into three groups: highly aggressive (4A and 5B), moderately aggressive (5A and 7A), and less aggressive (2). Isolate 5B was identified as the most aggressive, and it was the only one to result in seedling mortality. Out of the five vegetative growth parameters measured, only the bole size between treatments was not affected. The integration of both conventional and molecular approaches in disease confirmation allows for precise detection.

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First Report of Ganoderma ryvardenii causing Basal Stem Rot (BSR) disease on oil palm (Elaeis guineensis Jacq.) in Ghana
Emmanuellah Lekete-Lawson, Grace C. van der Puije, Enoch A. Osekre, Frank K. Ackah
F1000Research.2025; 14: 413. CrossRef
Gene expression of transcripts encoding putative secreted proteins from an oil palm fungal pathogen Ganoderma boninense
Mui Sie Jee, Chai-Ling Ho, Mohd Termizi Yusof, Sharon Yu Ling Lau, Frazer Midot, Mei Lieng Lo, Mei-Yee Chin, Lulie Melling
Physiological and Molecular Plant Pathology.2025; 138: 102715. CrossRef
First Report of Ganoderma ryvardenii causing Basal Stem Rot (BSR) disease on oil palm (Elaeis guineensis Jacq.) in Ghana
Emmanuellah Lekete-Lawson, Grace C. van der Puije, Enoch A. Osekre, Frank K. Ackah
F1000Research.2025; 14: 413. CrossRef
A review update on Ganoderma species: etiology and management approaches
Pratibha Thakur, Sonali Khanal, Ashwani Tapwal, Neha Sharma, Poonam Chauhan, Tamanna Singh Thakur, Dinesh Kumar, Rachna Verma
Antonie van Leeuwenhoek.2025;[Epub] CrossRef
Bioactivity and toxicity of polysaccharides derived from the phytopathogenic mushroom Ganoderma orbiforme cultured in a bioreactor
Danial ‘Aizat Norhisham, Jo Cheah, Nur Ardiyana Rejab, Zul Ilham, Nur Asyiqin Zahia-Azizan, Wan Abd Al Qadr Imad Wan-Mohtar
Scientific Reports.2025;[Epub] CrossRef
An In-Depth Study of Phytopathogenic Ganoderma: Pathogenicity, Advanced Detection Techniques, Control Strategies, and Sustainable Management
Samantha C. Karunarathna, Nimesha M. Patabendige, Wenhua Lu, Suhail Asad, Kalani K. Hapuarachchi
Journal of Fungi.2024; 10(6): 414. CrossRef
Advancements in the nanodelivery of azole-based fungicides to control oil palm pathogenic fungi
Azren Aida Asmawi, Fatmawati Adam, Nurul Aini Mohd Azman, Mohd Basyaruddin Abdul Rahman
Heliyon.2024; 10(18): e37132. CrossRef
Characterizations of Ganoderma species causing basal stem rot disease in coconut tree
Umesh Sajjan, Manjunath Hubballi, Abhay K. Pandey, V. Devappa, H. P. Maheswarappa
3 Biotech.2024;[Epub] CrossRef

Comparison of Conjunctival Sac Microbiome between Low and High Myopic Eyes: Kang Xiao , Zhengyu Chen , Qin Long; J. Microbiol. 2023;61(5):571-578. Published online April 21, 2023; DOI: https://doi.org/10.1007/s12275-023-00045-5

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Microbial communities played a vital role in maintaining homeostasis of ocular surface. However, no studies explored the myopia-associated conjunctiva microbiota changes until now. In this study, conjunctival sac swab specimens were collected from 12 eyes of low myopia (LM), and 14 eyes of high myopia (HM) patients. The V3–V4 region of the 16S rRNA gene was amplified and then sequenced. Statistical analysis was performed to investigate differences in the taxonomy and diversity between two groups. Compared to LM, higher Ocular Surface Disease Index (OSDI) scores were observed in HM group. The Shannon index of the HM was lower than that of the LM group (P = 0.017). Principle coordinate analysis and Partial Least Squares Discrimination Analysis showed distinct microbiome composition between two groups. At the phylum level, there were higher relative abundances of Proteobacteria (68.27% vs 38.51%) and lower abundances of Actinobacteria (3.71% vs 9.19%) in HM, compared to LM group (P = 0.031, 0.010, respectively). At the genus level, the abundances of Acinetobacter in HM (18.16%) were significantly higher than the LM (6.52%) group (P = 0.011). Actinobacteria levels were negatively correlated with the myopic spherical equivalent and OSDI scores. Moreover, positive correlations were found between Proteobacteria levels and OSDI scores, Acinetobacter levels were positively correlated with myopic spherical equivalent and OSDI scores. In conclusion, HM Patients have bacterial microbiota imbalance in the conjunctival sac, compared with LM patients. Proteobacteria, Actinobacteria, Acinetobacter may play roles in the HM associated ocular surface irritation.

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CXCL12/CXCR4 Axis is Involved in the Recruitment of NK Cells by HMGB1 Contributing to Persistent Airway Inflammation and AHR During the Late Stage of RSV Infection: Sisi Chen , Wei Tang , Guangyuan Yu , Zhengzhen Tang , Enmei Liu; J. Microbiol. 2023;61(4):461-469. Published online February 13, 2023; DOI: https://doi.org/10.1007/s12275-023-00018-8

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We previously showed that both high-mobility group box-1 (HMGB1) and natural killer (NK) cells contribute to respiratory syncytial virus (RSV)-induced persistent airway inflammation and airway hyperresponsiveness (AHR). Meanwhile, Chemokine (C-X-C motif) ligand 12 (CXCL12) and its specific receptor (chemokine receptor 4, CXCR4) play important roles in recruitment of immune cells. CXCL12 has been reported to form a complex with HMGB1 that binds to CXCR4 and increases inflammatory cell migration. The relationship between HMGB1, NK cells and chemokines in RSV-infected model remains unclear. An anti-HMGB1 neutralizing antibody and inhibitor of CXCR4 (AMD3100) was administered to observe changes of NK cells and airway disorders in nude mice and BALB/c mice. Results showed that the mRNA expression and protein levels of HMGB1 were elevated in late stage of RSV infection and persistent airway inflammation and AHR were diminished after administration of anti-HMGB1 antibodies, with an associated significant decrease in CXCR4+ NK cells. In addition, CXCL12 and CXCR4 were reduced after HMGB1 blockade. Treatment with AMD3100 significantly suppressed the recruitment of NK cells and alleviated the airway disorders. Thus, CXCL12/CXCR4 axis is involved in the recruitment of NK cells by HMGB1, contributing to persistent airway inflammation and AHR during the late stage of RSV infection.

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Review

Recent Advances in CRISPR‑Cas Technologies for Synthetic Biology: Song Hee Jeong , Ho Joung Lee , Sang Jun Lee; J. Microbiol. 2023;61(1):13-36. Published online February 1, 2023; DOI: https://doi.org/10.1007/s12275-022-00005-5

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With developments in synthetic biology, “engineering biology” has emerged through standardization and platformization based on hierarchical, orthogonal, and modularized biological systems. Genome engineering is necessary to manufacture and design synthetic cells with desired functions by using bioparts obtained from sequence databases. Among various tools, the CRISPR-Cas system is modularly composed of guide RNA and Cas nuclease; therefore, it is convenient for editing the genome freely. Recently, various strategies have been developed to accurately edit the genome at a single nucleotide level. Furthermore, CRISPR-Cas technology has been extended to molecular diagnostics for nucleic acids and detection of pathogens, including disease-causing viruses. Moreover, CRISPR technology, which can precisely control the expression of specific genes in cells, is evolving to find the target of metabolic biotechnology. In this review, we summarize the status of various CRISPR technologies that can be applied to synthetic biology and discuss the development of synthetic biology combined with CRISPR technology in microbiology.

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Journal Articles

Description of Deefgea piscis sp. nov., and Deefgea tanakiae sp. nov., isolated from the gut of Korean indigenous fish: Do-Hun Gim , So-Yeon Lee , Jeong Eun Han , Jae-Yun Lee , Seo Min Kang , Jin-Woo Bae; J. Microbiol. 2022;60(11):1061-1069. Published online September 1, 2022; DOI: https://doi.org/10.1007/s12275-022-2250-5

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Three novel strains, (D17T, D13, and D25T) isolated from the gut of the Korean dark sleeper (Odontobutis platycephala), Kumgang fat minnow (Rhynchocypris kumgangensis), and the Korean oily bitterling (Tanakia koreensis) were identified as two novel species. Strains D17T and D13 showed the highest similarities in 16S rRNA gene and complete genome sequences to Deefgea rivuli WB 3.4-79T (98.0% and 97.9%, respectively, of 16S rRNA gene sequence similarity, 77.8% and 77.7%, respectively, of orthologous average nucleotide identity, Ortho- ANI, and 21.9% and 21.9%, respectively, of digital DNA-DNA hybridization, dDDH). Strain D17T showed the highest similarities in 16S rRNA gene and complete genome sequences to D13 (99.9% of 16S rRNA gene sequence similarity, 91.8% of OrthoANI, and 45.1% of dDDH); therefore, strains D17T and D13 were assigned as the same species. Strain D25T showed the highest similarities in 16S rRNA gene and complete genome sequences to D. chitinilytica Nsw-4T (98.2% of 16S rRNA gene sequence similarity, 82.4% of OrthoANI, and 25.1% of dDDH). Strains D17T and D13 were Gram-stain-negative, facultative anaerobes, rod-shaped, non-motile, and non-flagellated. Strain D25T was Gram-stain-negative, facultative anaerobe, rodshaped, and motile by a single polar flagellum. These strains had C16:0 and summed feature 3 (C16:1 ω7c and/or C16:1 ω6c) as the major cellular fatty acids and possessed Q-8 as a major respiratory ubiquinone. All three strains contained phosphatidylethanolamine and phosphatidylglycerol as the major polar lipids. Based on polyphasic taxonomic data, strains D17T, D13, and D25T represent two novel species of the genus Deefgea. We propose the name Deefgea piscis sp. nov. for strains D17T (= KCTC 82958T = JCM 34941T) and D13 (= KCTC 92368), and Deefgea tanakiae sp. nov. for strain D25T (= KCTC 82959T = JCM 34942T).

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[Protocol] Development of DNA aptamers specific for small therapeutic peptides using a modified SELEX method: Jaemin Lee , Minkyung Ryu , Dayeong Bae , Hong-Man Kim , Seong-il Eyun , Jeehyeon Bae , Kangseok Lee; J. Microbiol. 2022;60(7):659-667. Published online June 22, 2022; DOI: https://doi.org/10.1007/s12275-022-2235-4

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Aptamers are short single-stranded DNA or RNA oligonucleotides capable of binding with high affinity and specificity to target molecules. Because of their durability and ease of synthesis, aptamers are used in a wide range of biomedical fields, including the diagnosis of diseases and targeted delivery of therapeutic agents. The aptamers were selected using a process called systematic evolution of ligands by exponential enrichment (SELEX), which has been improved for various research purposes since its development in 1990. In this protocol, we describe a modified SELEX method that rapidly produces high aptamer screening yields using two types of magnetic beads. Using this method, we isolated an aptamer that specifically binds to an antimicrobial peptide. We suggest that by conjugating a small therapeutic-specific aptamer to a gold nanoparticle-based delivery system, which enhances the stability and intracellular delivery of peptides, aptamers selected by our method can be used for the development of therapeutic agents utilizing small therapeutic peptides.

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Satparkash Singh, Bhavna Jha, Pratiksha Tiwari, Vinay G. Joshi, Adarsh Mishra, Yashpal Singh Malik
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Design and application of microfluidics in aptamer SELEX and Aptasensors
Shikun Zhang, Yingming Zhang, Zhiyuan Ning, Mengxia Duan, Xianfeng Lin, Nuo Duan, Zhouping Wang, Shijia Wu
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Comparative analysis of the colistin resistance-regulating gene cluster in Klebsiella species: Sun Ju Kim , Hongbaek Cho , Kwan Soo Ko; J. Microbiol. 2022;60(5):461-468. Published online April 18, 2022; DOI: https://doi.org/10.1007/s12275-022-1640-z

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CrrAB two-component regulatory system is associated with colistin resistance in Klebsiella pneumoniae. Recently, some K. pneumoniae isolates lacking crrAB genes have been identified. In this study, we investigated the distribution and structural variation of the crrBAC-kexD cluster. To evaluate the structural variation of the crrBAC-kexD cluster, we explored 59 clinical K. pneumoniae isolates from Korea, and 508 whole genomes of K. pneumoniae and other strains of Klebsiella sp. Significant structural variations in crrBAC-kexD and its surrounding regions were identified among K. pneumoniae genomes. Within the genus Klebsiella, the cluster was identified only in K. pneumoniae, K. variicola, and K. quasipneumoniae, which form the K. pneumoniae complex. Among the 304 available K. pneumoniae genomes, an intact crrBAC-kexD cluster was identified in 178 isolates (58.6%), while the cluster was absent in 90 isolates (29.6%). Partial deletions within the cluster were identified in 22 genomes (7.2%). The most diverse structural patterns of the crrBAC-kexD cluster were observed in ST11 strains. Some clades lacked the crrBAC-kexD cluster. The crrBAC-kexD cluster was identified in the genomes of other bacterial species, including Citrobacter freundii and Enterobacter ludwigii. The crrBAC-kexD cluster is proposed to have been acquired by the ancestor of the K. pneumoniae complex from other bacterial species and the cluster may have been lost and re-acquired repeatedly in K. pneumoniae strains according to the phylogenetic analysis. The dynamic evolution of the crrBAC-kexD cluster suggests that it may have other roles, in addition to colistin resistance, in bacterial physiology.

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Infection by Sclerotium rolfsii will cause serious disease and lead to significant economic losses in chili pepper. In this study, the response of pepper during S. rolfsii infection was explored by electron microscopy, physiological determination and integrated proteome and metabolome analyses. Our results showed that the stomata of pepper stems were important portals for S. rolfsii infection. The plant cell morphology was significantly changed at the time of the fungal hyphae just contacting (T1) or surrounding (T2) the pepper. The chlorophyll, carotenoid, and MDA contents and the activities of POD, SOD, and CAT were markedly upregulated at T1 and T2. Approximately 4129 proteins and 823 metabolites were clearly identified in proteome and metabolome analyses, respectively. A change in 396 proteins and 54 metabolites in pepper stem tissues was observed at T1 compared with 438 proteins and 53 metabolites at T2. The proteins and metabolites related to photosynthesis and antioxidant systems in chloroplasts and mitochondria were disproportionally affected by S. rolfsii infection, impacting carbohydrate and amino acid metabolism. This study provided new insights into the response mechanism in pepper stems during S. rolfsii infection, which can guide future work on fungal disease resistance breeding in pepper.

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Sensitivity determination and resistance mechanism of Sclerotium rolfsii to difenoconazole
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Exploiting the antibacterial mechanism of phenazine substances from Lysobacter antibioticus 13-6 against Xanthomonas oryzae pv. oryzicola: Qi Liu , Jun Yang , Waqar Ahmed , Xiaoyan Wan , Lanfang Wei , Guanghai Ji; J. Microbiol. 2022;60(5):496-510. Published online March 31, 2022; DOI: https://doi.org/10.1007/s12275-022-1542-0

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Bacterial leaf streak caused by Xanthomonas oryzae pv. oryzicola (Xoc) is one of the most destructive diseases affecting rice production worldwide. In this study, we extracted and purified phenazine substances from the secondary metabolites of Lysobacter antibioticus 13-6. The bacteriostatic mechanism of phenazine substances against Xoc was investigated through physiological response and transcriptomic analysis.
Results
showed that phenazine substances affects the cell membrane permeability of Xoc, which causes cell swelling and deformation, blockage of flagellum synthesis, and imbalance of intracellular environment. The changes in intracellular environment affect the physiological and metabolic functions of Xoc, which reduces the formation of pathogenic factors and pathogenicity. Through transcriptomic analysis, we found that among differentially expressed genes, the expression of 595 genes was induced significantly (275 up-regulated and 320 down-regulated). In addition, we observed that phenazine substances affects three main functions of Xoc, i.e., transmembrane transporter activity, DNA-mediated transposition, and structural molecular activity. Phenazine substances also inhibits the potassium ion transport system that reduces Xoc resistance and induces the phosphate ion transport system to maintain the stability of the internal environment. Finally, we conclude that phenazine substances could retard cell growth and reduce the pathogenicity of Xoc by affecting cell structure and physiological metabolism. Altogether, our study highlights latest insights into the antibacterial mechanism of phenazine substances against Xoc and provides basic guidance to manage the incidence of bacterial leaf streak of rice.

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Characterization of a cold-adapted debranching enzyme and its role in glycogen metabolism and virulence of Vibrio vulnificus MO6-24/O: Ah-Reum Han , Haeyoung Kim , Jong-Tae Park , Jung-Wan Kim; J. Microbiol. 2022;60(4):375-386. Published online February 14, 2022; DOI: https://doi.org/10.1007/s12275-022-1507-3

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Vibrio vulnificus MO6-24/O has three genes annotated as debranching enzymes or pullulanase genes. Among them, the gene encoded by VVMO6_03032 (vvde1) shares a higher similarity at the amino acid sequence level to the glycogen debranching enzymes, AmyX of Bacillus subtilis (40.5%) and GlgX of Escherichia coli (55.5%), than those encoded by the other two genes. The vvde1 gene encoded a protein with a molecular mass of 75.56 kDa and purified Vvde1 efficiently hydrolyzed glycogen and pullulan to shorter chains of maltodextrin and maltotriose (G3), respectively. However, it hydrolyzed amylopectin and soluble starch far less efficiently, and β-cyclodextrin (β-CD) only rarely. The optimal pH and temperature of Vvde1 was 6.5 and 25°C, respectively. Vvde1 was a cold-adapted debranching enzyme with more than 60% residual activity at 5°C. It could maintain stability for 2 days at 25°C and 1 day at 35°C, but it destabilized drastically at 40°C. The Vvde1 activity was inhibited considerably by Cu2+, Hg2+, and Zn2+, while it was slightly enhanced by Co2+, Ca2+, Ni2+, and Fe2+. The vvde1 knock-out mutant accumulated more glycogen than the wild-type in media supplemented with 1.0% maltodextrin; however, the side chain length distribution of glycogen was similar to that of the wild-type except G3, which was much more abundant in the mutant. Therefore, Vvde1 seemed to debranch glycogen with the degree of polymerization 3 (DP3) as the specific target branch length. Virulence of the pathogen against Caenorhabditis elegans was attenuated significantly by the vvde1 mutation. These results suggest that Vvde1 might be a unique glycogen debranching enzyme that is involved in both glycogen utilization and shaping of glycogen molecules, and contributes toward virulence of the pathogen.

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Characterization of glycogen-related glycoside hydrolase glgX and glgB from Klebsiella pneumoniae and their roles in biofilm formation and virulence
Xinyue Liu, Jialin Li, Ruibing Wu, Liping Bai
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Function of the mdxR gene encoding a novel regulator for carbohydrate metabolism and sporulation in Bacillus subtilis 168
Tianshi Wang, Jung-Wan Kim
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Identification of a novel cyclomaltodextrinase annotated as a neopullulanase in the genome of Bacillus cereus
Bo-Ram Park, Davoodbasha MubarakAli, Jung-Wan Kim
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Functional conservation of specialized ribosomes bearing genome-encoded variant rRNAs in Vibrio species
Younkyung Choi, Eunkyoung Shin, Minho Lee, Ji-Hyun Yeom, Kangseok Lee, Bashir Sajo Mienda
PLOS ONE.2023; 18(12): e0289072. CrossRef
Functional characterization of maltodextrin glucosidase for maltodextrin and glycogen metabolism in Vibrio vulnificus MO6-24/O
Hye-Young Kim, MubarakAli Davoodbasha, Jung-Wan Kim
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Geographic diversity in Helicobacter pylori oipA genotype between Korean and United States isolates: Aeryun Kim , Jing Lai , D. Scott Merrell , Ji-Hye Kim , Hanfu Su , Jeong-Heon Cha; J. Microbiol. 2021;59(12):1125-1132. Published online October 31, 2021; DOI: https://doi.org/10.1007/s12275-021-1450-8

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Helicobacter pylori outer membrane inflammatory protein A (OipA) was originally named for its role in inducing inflammation in the host, as evidenced by high mucosal IL-8 levels. Expression of OipA is regulated by phase variation of a CT dinucleotide-repeat located in the 5􍿁􀁇region of the gene. However, little is known about OipA geographic diversity across isolates. To address this gap, we conducted a large-scale molecular epidemiologic analysis using H. pylori clinical isolates obtained from two geographically distinct populations: Korea and the United States (US). Most Korean isolates (98.7%) possessed two copies of oipA located at two specific loci (A and B) while all US isolates contained only one copy of oipA at locus A. Furthermore, most Korean oipA (94.8%) possessed three or less CT repeats while most US oipA (96.6%) contained five or more CT repeats. Among the two copies, all Korean H. pylori possessed at least one oipA ‘on’ phase variant while the single copy of oipA in US isolates showed 56.2% ‘on’ and 43.8% ‘off.’ Thus, host differences seem to have driven geographic diversification of H. pylori across these populations such that OipA expression in US isolates is still regulated by phase variation with 5 or more CT repeats, while Korean isolates always express OipA; duplication of the oipA combined with a reduction of CT repeats to three or less ensures continued expression. En masse, these findings suggest that diversity in the oipA gene copy number, CT repeats, and phase variation among H. pylori from different populations may confer a benefit in adaptation to particular host populations.

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Pathogenicity and virulence of Helicobacter pylori : A paradigm of chronic infection
Marguerite Clyne, Tadhg Ó Cróinín
Virulence.2025;[Epub] CrossRef
Genetic diversity of the oipA gene among Helicobacter pylori isolates and clinical outcome in Vietnam
Thi Hong Nhung Thai, Hong Phong Nguyen, Thi Hai Yen Nguyen, Thi Be Hai Nguyen, Thai Hoa Nguyen, Thi Mai Ngan Nguyen, Thi Minh Thi Ha
Infection, Genetics and Evolution.2023; 112: 105438. CrossRef
Characterization of East-Asian Helicobacter pylori encoding Western EPIYA-ABC CagA
Kavinda Tissera, Myeong-A Kim, Jing Lai, Sacheera Angulmaduwa, Aeryun Kim, D. Scott Merrell, Ji-Hye Kim, Hanfu Su, Jeong-Heon Cha
Journal of Microbiology.2022; 60(2): 207. CrossRef

The transcription factor Cas5 suppresses hyphal morphogenesis during yeast-form growth in Candida albicans: Jong-Myeong Kim , Hye Yun Moon , Dong Wook Lee , Hyun Ah Kang , Jeong-Yoon Kim; J. Microbiol. 2021;59(10):911-919. Published online September 7, 2021; DOI: https://doi.org/10.1007/s12275-021-1326-y

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Candida albicans is an opportunistic human pathogen that exists as yeast, hyphal or pseudohyphal forms depending on pH, nutrients, and temperature. The morphological transition from yeast to hyphae, which is required for the complete virulence of C. albicans, is controlled by many transcription factors that activate or repress hypha-specific genes. The C. albicans transcriptional factor Cas5, a key regulator of genes involved in cell wall integrity, affects the susceptibility of C. albicans to fluconazole, an inhibitor of ergosterol synthesis. In this study, we found that deletion of CAS5 in C. albicans decreased the expression levels of a set of ergosterol biosynthesis genes, such as ERG2, ERG3, ERG5, ERG6, ERG11, and ERG24,
result
ing in the accumulation of lanosterol and zymosterol, which are intermediate metabolites in the ergosterol biosynthesis pathway. Interestingly, it was observed that the cas5Δ/Δ mutant could not maintain the yeast form under non-hyphainducing conditions, while the CAS5-overexpressing cells could not form hyphae under hypha-inducing conditions. Consistent with these observations, the cas5Δ/Δ mutant highly expressed hypha-specific genes, ALS3, ECE1, and HWP1, under non-hypha-inducing conditions. In addition, CAS5 transcription was significantly downregulated immediately after hyphal initiation in the wild-type strain. Furthermore, the cas5Δ/Δ mutant reduced the transcription of NRG1, which encodes a major repressor of hyphal morphogenesis, while Cas5 overexpression increased the transcription of NRG1 under hyphainducing conditions. Collectively, this study suggests the potential role of Cas5 as a repressor of hypha-specific genes during yeast-form growth of C. albicans.

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Cas5 Regulates the Exposure of β-Glucan, the Cell Surface Hydrophobicity, and the Expression of Cell Wall Proteins to Remodel the Candida albicans Cell Wall and Participates in the Recruitment of Neutrophils
Qiyue Zhang, Guanglin Li, Yanmei Wang, Chen Yang, Wenhui Bai, Qingqing Li, Jiye Zhang, Peipei Zhang
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Che-Kang Chang, Min-Chi Yang, Hsueh-Fen Chen, Yi-Ling Liao, Chung-Yu Lan
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CagL polymorphisms between East Asian and Western Helicobacter pylori are associated with different abilities to induce IL-8 secretion: Yun Hui Choi , Jing Lai , Myeong-A Kim , Aeryun Kim , Jinmoon Kim , Hanfu Su , Linhu Ge , Jeong-Heon Cha; J. Microbiol. 2021;59(8):763-770. Published online June 1, 2021; DOI: https://doi.org/10.1007/s12275-021-1136-2

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Helicobacter pylori colonizes human gastric mucosa. Its infection is associated with gastric diseases including gastric cancer. CagA is one of the most important toxins produced by H. pylori. It is related to gastric cancer which can be injected into host cells via a type IV secretion system (T4SS). CagL is a structural component of T4SS apparatus, which triggers host cell signaling pathway. It has been reported that CagL polymorphisms may influence the severity of disease development. To explore the contribution of CagL polymorphisms between East Asian and Western H. pylori in pathogenesis, cagL gene in G27 H. pylori was swapped by K74 cagL which is identical to East Asian CagL consensus sequence and by Western 26695 H. pylori, resulting in G27ΔcagL/cagLK74 and G27ΔcagL/cagL26695, respectively. Intriguingly, G27ΔcagL/ cagLK74 showed significantly less ability of IL-8 induction than G27ΔcagL/cagL26695 while displayed similar abilities of CagA phosphorylation, and cell elongation. Taken together, this study suggests that the CagL polymorphism may influence IL-8 induction, and K74 CagL has less ability to induce IL-8 secretion than G27 or 26695 CagL. Further research should address how the different capabilities of IL-8 induction between intraspecies-CagL are associated with the large differences of the incidence of gastric cancer between East Asian and Western countries.

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Hassan Valadbeigi, Saeed Khoshnood, Babak Negahdari, Mohd Azmuddin Abdullah, Mohammad Hossein Haddadi, Abhimanyu Abhimanyu
BioMed Research International.2023;[Epub] CrossRef
New CagL Amino Acid Polymorphism Patterns of Helicobacter pylori in Peptic Ulcer and Non-Ulcer Dyspepsia
Reyhan Caliskan, Silva Polat Sari, Bahadir Ercan, Kivanc Derya Peker, Mehtap Omac Sonmez, Ozer Akgul, Burcu Sapmaz, Aliye Soylu, Gokhan Tolga Adas, Yasar Ali Oner, Pelin Yuksel Mayda
Medicina.2022; 58(12): 1738. CrossRef
Geographic diversity in Helicobacter pylori oipA genotype between Korean and United States isolates
Aeryun Kim, Jing Lai, D. Scott Merrell, Ji-Hye Kim, Hanfu Su, Jeong-Heon Cha
Journal of Microbiology.2021; 59(12): 1125. CrossRef

The quorum sensing regulator OpaR is a repressor of polar flagellum genes in Vibrio parahaemolyticus: Renfei Lu , Junfang Sun , Yue Qiu , Miaomiao Zhang , Xingfan Xue , Xue Li , Wenhui Yang , Dongsheng Zhou , Lingfei Hu , Yiquan Zhang; J. Microbiol. 2021;59(7):651-657. Published online June 1, 2021; DOI: https://doi.org/10.1007/s12275-021-0629-3

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Abstract PDF

Vibrio parahaemolyticus possesses two types of flagella: a single polar flagellum (Pof) for swimming and the peritrichous lateral flagella (Laf) for swarming. Expression of Laf genes has previously been reported to be regulated by the quorum sensing (QS) regulators AphA and OpaR. In the present study, we showed that OpaR, the QS regulator at high cell density (HCD), acted as a negative regulator of swimming motility and the transcription of Pof genes in V. parahaemolyticus. OpaR bound to the promoter-proximal DNA regions of flgAMN, flgMN, and flgBCDEFGHIJ within the Pof gene loci to repress their transcription, whereas it negatively regulates the transcription of flgKL-flaC in an indirect manner. Thus, this work investigated how QS regulated the swimming motility via direct action of its master regulator OpaR on the transcription of Pof genes in V. parahaemolyticus.

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Effects of the loss of mismatch repair genes on single-strand annealing between divergent sequences in Saccharomyces cerevisiae: Ye-Seul Lim , Ju-Hee Choi , Kyu-Jin Ahn , Min-Ku Kim , Sung-Ho Bae; J. Microbiol. 2021;59(4):401-409. Published online March 29, 2021; DOI: https://doi.org/10.1007/s12275-021-1076-x

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Abstract PDF: Eukaryotic genomes contain many duplicated genes closely located with each other, such as the hexose transporter (HXT) genes in Saccharomyces cerevisiae. They can potentially recombine via single-strand annealing (SSA) pathway. SSA between highly divergent sequences generates heteroduplex DNA intermediates with many mismatches, which can be corrected by mismatch repair (MMR), resulting in recombinant sequences with a single junction point. In this report, we demonstrate that SSA between HXT1 and HXT4 genes in MMR-deficient yeast cells produces recombinant genes with multiple-junctions resulting from alternating HXT1 and HXT4 tracts. The mutations in MMR genes had differential effects on SSA frequencies; msh6Δ mutation significantly stimulated SSA events, whereas msh2Δ and msh3Δ slightly suppressed it. We set up an assay that can identify a pair of recombinant genes derived from a single heteroduplex DNA. As a result, the recombinant genes with multiple-junctions were found to accompany genes with single-junctions. Based on the results presented here, a model was proposed to generate multiple-junctions in SSA pathway involving an alternative short-patch repair system.

Functional and structural characterization of Deinococcus radiodurans R1 MazEF toxin-antitoxin system, Dr0416-Dr0417: Immanuel Dhanasingh , Eunsil Choi , Jeongeun Lee , Sung Haeng Lee , Jihwan Hwang; J. Microbiol. 2021;59(2):186-201. Published online February 1, 2021; DOI: https://doi.org/10.1007/s12275-021-0523-z

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In prokaryotes, toxin-antitoxin (TA) systems are commonly found. They likely reflect the adaptation of pathogenic bacteria or extremophiles to various unfavorable environments by slowing their growth rate. Genomic analysis of the extremophile Deinococcus radiodurans R1 revealed the presence of eight type II TA systems, including the genes dr0417, dr0660, dr1530, dr0690, and dr1807. Expression of these toxin genes led to inhibition of Escherichia coli growth, whereas their antidote antitoxins were able to recover the growth defect. Remarkably, Dr0417 (DrMazF) showed endoribonuclease activity toward rRNAs as well as mRNAs, as determined by in vivo and in vitro RNA cleavage assays, and this activity was inhibited by Dr0416 (DrMazE). It was also found that the expression of dr0416-0417 module is directly regulated by the DrMazE-MazF complex. Furthermore, this TA module was induced under stress conditions and plays an important role in survival. To understand the regulatory mechanism at the molecular level, we determined the first high-resolution structures of DrMazF alone and of the DrMazE-MazF complex. In contrast with the hetero-hexameric state of typical MazEMazF complexes found in other species, DrMazE-MazF crystal structure consists of a hetero-trimer, with the DNA-binding domain of DrMazE undergoing self-cleavage at the flexible linker loop. Our structure revealed that the unique residue R54 provides an additional positive charge to the substratebinding pocket of DrMazF, its mutation significantly affects the endonuclease activity. Thus, our work reports the unique structural and biochemical features of the DrMazE-MazF system.

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Valentin Lombard, Dan Timsit, Sergei Grudinin, Elodie Laine
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Eunsil Choi, Ahhyun Huh, Changmin Oh, Jeong-Il Oh, Ho Young Kang, Jihwan Hwang
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Alireza Japoni-Nejad, Elnaz Harifi Mood, Parastoo Ehsani, Soroush Sardari, Fatemah Sadeghpour Heravi, Saeid Bouzari, Nader Shahrokhi
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Spot 42 RNA regulates putrescine catabolism in Escherichia coli by controlling the expression of puuE at the post-transcription level: Xin Sun , Ruyan Li , Guochen Wan , Wanli Peng , Shuangjun Lin , Zixin Deng , Rubing Liang; J. Microbiol. 2021;59(2):175-185. Published online February 1, 2021; DOI: https://doi.org/10.1007/s12275-021-0421-4

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Putrescine, a typical polyamine compound important for cell growth and stress resistance, can be utilized as an energy source. However, the regulation of its catabolism is unclear. Here the small RNA (sRNA) Spot 42, an essential regulator of carbon catabolite repression (CCR), was confirmed to participate in the post-transcriptional regulation of putrescine catabolism in Escherichia coli. Its encoding gene spf exclusively exists in the γ-proteobacteria and contains specific binding sites to the 5􍿁-untranslated regions of the puuE gene, which encodes transaminase in the glutamylated putrescine pathway of putrescine catabolism converting γ-aminobutyrate (GABA) into succinate semialdehyde (SSA). The transcription of the spf gene was induced by glucose, inhibited by putrescine, and unaffected by PuuR, the repressor of puu genes. Excess Spot 42 repressed the expression of PuuE significantly in an antisense mechanism through the direct and specific base-pairing between the 51–57 nt of Spot 42 and the 5􍿁- UTR of puuE. Interestingly, Spot 42 mainly influenced the stability of the puuCBE transcript. This work revealed the regulatory role of Spot 42 in putrescine catabolism, in the switch between favorable and non-favorable carbon source utilization, and in the balance of metabolism of carbon and nitrogen sources.

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Parahaliea maris sp. nov., isolated from surface seawater and emended description of the genus Parahaliea: Yang Liu , Juan Du , Jun Zhang , Qiliang Lai , Zongze Shao , Honghui Zhu; J. Microbiol. 2020;58(2):92-98. Published online January 29, 2020; DOI: https://doi.org/10.1007/s12275-020-9405-z

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A Gram-stain-negative, strictly aerobic, short-rod-shaped, and non-motile bacterial strain designated HSLHS9T was isolated from surface seawater collected from the South China Sea. Strain HSLHS9T could grow at 15–41°C (optimum 28°C), at pH 5.0–9.0 (optimum 6.0–7.0), and in 0–7% (w/v) NaCl (optimum 2–3%). Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain HSLHS9T shared high identities with the closely related Parahaliea aestuarii S2-26T (98.6%) and Parahaliea mediterranea 7SM29T (97.8%) and formed a distinct lineage within the genus Parahaliea. Wholegenome sequencing of strain HSLHS9T revealed the size of 4.8 Mbp and DNA G + C content of 61.8 mol%. Strain HSLHS9T shared the digital DNA-DNA hybridization values of 22.4% and 23.0%, and the average nucleotide identities of 79.7% and 79.9%, respectively, with the two type strains above. The predominant cellular fatty acids of the strain were summed feature 8 (C18:1 ω6c and/or C18:1 ω7c), summed feature 3 (C16:1 ω7c and/or C16:1 ω6c), C17:1 ω8c, and C16:0. The sole isoprenoid quinone was identified as Q-8. The polar lipids were phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine, aminolipid, and two glycolipids. Based on taxonomic data obtained in this study, it is suggested that strain HSLHS9T represents a novel species of the genus Parahaliea, for which the name Parahaliea maris sp. nov. is proposed. The type strain is HSLHS9T (= MCCC 1A06717T = KCTC 52307T). An emended description of the genus Parahaliea is also provided.

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Sutterella faecalis sp. nov., isolated from human faeces: Byeong Seob Oh , Ji-Sun Kim , Seung Yeob Yu , Seoung Woo Ryu , Seung-Hwan Park , Se Won Kang , Jam-Eon Park , Seung-Hyeon Choi , Kook-Il Han , Keun Chul Lee , Mi Kyung Eom , Min Kuk Suh , Han Sol Kim , Dong Ho Lee , Hyuk Yoon , Byung-Yong Kim , Je Hee Lee , Jung-Sook Lee , Ju Huck Lee; J. Microbiol. 2020;58(2):99-104. Published online January 29, 2020; DOI: https://doi.org/10.1007/s12275-020-9396-9

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An obligately anaerobic, Gram-stain-negative, non-motile, non-spore-forming, and coccobacilli-shaped bacterial strain, designated KGMB03119T, was isolated from human faeces from a Korean. Phylogenetic analysis based on the 16S rRNA gene sequence revealed that the isolate was a member of the genus Sutterella and most closely related to Sutterlla wadsworthensis KCTC 15691T (96.8% 16S rRNA gene sequence similarity). The DNA G + C content of strain KGMB03119T was 58.3 mol% as determined from its whole genome sequence. Strain KGMB03119T was asaccharolytic, catalase-positive, oxidase- and urease-negative. Furthermore, the isolate was positive for alkaline phosphatase, leucine arylamidase, acid phosphatase, arginine arylamidase, alanine arylamidase, and glycine arylamidase. The major cellular fatty acids (> 10%) of the isolate were C18:1ω9c and C16:0. Methylmenaquinone-5 (MMK-5, 100%) was the predominant isoprenoid quinone in the isolate. Based on the phylogenetic, physiological, and chemotaxonomic characteristics, strain KGMB03119T represents a novel species, for which the name Sutterella faecalis sp. nov. is proposed. The type strain is KGMB03119T (= KCTC 15823T = NBRC 114254T).

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Saccharibacillus brassicae sp. nov., an endophytic bacterium isolated from kimchi cabbage (Brassica rapa subsp. pekinensis) seeds: Lingmin Jiang , Chan Ju Lim , Song-Gun Kim , Jae Cheol Jeong , Cha Young Kim , Dae-Hyuk Kim , Suk Weon Kim , Jiyoung Lee; J. Microbiol. 2020;58(1):24-29. Published online November 25, 2019; DOI: https://doi.org/10.1007/s12275-020-9346-6

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Strain ATSA2T was isolated from surface-sterilized kimchi cabbage (Brassica rapa subsp. pekinensis) seeds and represents a novel bacterium based on the polyphasic taxonomic approach. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain ATSA2T formed a lineage within genus Saccharibacillus and was most closely to Saccharibacillus deserti WLG055T (98.1%) and Saccharibacillus qingshengii H6T (97.9%). The whole-genome of ATSA2T comprised a 5,619,468 bp of circular chromosome with 58.4% G + C content. The DNA-DNA relatedness values between strain ATSA2T and its closely related type strains S. deserti WLJ055T and S. qingshengii H6T were 26.0% and 24.0%, respectively. Multiple gene clusters associated with plant growth promotion activities (stress response, nitrogen and phosphorus metabolism, and auxin biosynthesis) were annotated in the genome. Strain ATSA2T was Gram-positive, endospore-forming, facultatively anaerobic, and rod-shaped. It grew at 15–37°C (optimum 25°C), pH 6.0–10.0 (optimum pH 8.0), and in the presence of 0–5% (w/v) NaCl (optimum 1%). The major cellular fatty acids (> 10%) of strain ATSA2T were anteiso- C15:0 and C16:0. MK-7 was the major isoprenoid quinone. The major polar lipids present were diphosphatidylglycerol, phosphatidylglycerol, and three unknown glycolipids. Based on its phylogenetic, genomic, phenotypic, and chemotaxonomic features, strain ATSA2T is proposed to represent a novel species of genus Saccharibacillus, for which the name is Saccharibacillus brassicae sp. nov. The type strain is ATSA2T (KCTC 43072T = CCTCC AB 2019223T).

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Flavobacterium humi sp. nov., a flexirubin-type pigment producing bacterium, isolated from soil: Inhyup Kim , Jiyoun Kim , Geeta Chhetri , Taegun Seo; J. Microbiol. 2019;57(12):1079-1085. Published online November 22, 2019; DOI: https://doi.org/10.1007/s12275-019-9350-x

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A yellow pigmented, Gram-stain-negative, strictly aerobic, rod-shaped, motile by means of gliding, catalase and oxidase positive bacterium, designated strain DS2-AT, was isolated from soil. Growth was observed at 4–32°C (optimum, 28°C), pH 6–9 (optimum, 7.0), and with 0–0.25% (w/v) NaCl (optimum, 0%). Phylogenetic analysis of 16S rRNA gene sequence revealed that strain DS2-AT belonged to the genus Flavobacterium and was most closely related to Flavobacterium aquatile LMG 4008T (96.4%), Flavobacterium terrae DSM 18829T (95.6%), Flavobacterium vireti THG-SM1T (95.5%), Flavobacterium inkyongense IMCC27201T (95.4%), Flavobacterium brevivitae TTM-43T (95.2%), and Flavobacterium cucumis DSM 18830T (95.2%). Strain DS2-AT produces flexirubin- type pigments. The major fatty acids were iso-C15:0, iso-C17:0 3-OH, and iso-C15:0 3-OH. The major respiratory quinone was identified as menaquinone-6. The major polar lipid was found to be phosphatidylethanolamine. The average nucleotide identity values between strain DS2-AT and selected taxa, F. aquatile LMG 4008T, F. terrae DSM 18829T, and F. cucumis DSM 18830T, were 72, 72.7, and 71.6%, respectively. The draft genome of strain DS2-AT has a number of 14 contigs, scaffold N50 of 476,310 bp and a total size of 3,563,867 bp. Additionally, strain DS2-AT contains 3,127 of gene, 41 of tRNA, 6 of rRNA, and 3 of ncRNA. The DNA G + C content of stain DS2-AT was 40.7 mol%. Based on phylogenetic and phenotypic analyses, strain DS2-AT is considered as a novel species of the genus Flavobacterium, for which the name Flavobacterium humi sp. nov., (type strain DS2-AT = KACC 19715T = JCM 32786T) has been proposed.

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Anaerotignum faecicola sp. nov., isolated from human faeces: Seung-Hyeon Choi , Ji-Sun Kim , Jam-Eon Park , Keun Chul Lee , Mi Kyung Eom , Byeong Seob Oh , Seung Yeob Yu , Se Won Kang , Kook-Il Han , Min Kuk Suh , Dong Ho Lee , Hyuk Yoon , Byung-Yong Kim , Je Hee Lee , Ju Huck Lee , Jung-Sook Lee , Seung-Hwan Park; J. Microbiol. 2019;57(12):1073-1078. Published online November 4, 2019; DOI: https://doi.org/10.1007/s12275-019-9268-3

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A strictly anaerobic bacterium, designated as strain KGMB- 03357T, was isolated from the faeces of a healthy Korean selected by Bundang Seoul National University based on health status. Cells of strain KGMB03357T are Gram-stain-positive, non-motile, non-spore-forming, and observed as straight or curved rods. The isolate grew at 10–45°C (optimum temperature of 40°C) and a pH range of 5.1–10.5 (optimum pH of 6.8). Analysis of phylogenetic trees based on the 16S rRNA gene sequences revealed that strain KGMB03357T forms a lineage within the genus Anaerotignum, and is most closely related to Anaerotignum lactatifermentans G17T (= KCTC 15066T, 96.1%), Anaerotignum propionicum DSM 1682T (= KCTC 5582T, 94.9%), Anaerotignum neopropionicum DSM 03847T (= KCTC 15564T, 94.9%), and Anaerotignum aminivorans SH021T (= KCTC 15705T, 94.8%). The ANI values between strain KGMB 03357T and members of the genus Anaerotignum were 73.3–71.0%, which are below the ANI criterion for interspecies identity. The DNA G + C content based on the whole-genome sequence is 47.3 mol%. The major cellular fatty acids of strain KGMB03357T are C16:0, C18:0, C18:1 cis 9, and anteiso-C15:0. Strain KGMB03357T contains meso-diaminopimelic acid as the diagnostic amino acid in the cell wall peptidoglycan. Based on the phenotypic, phylogenetic, and genomic properties, strain KGMB 03357T represents a novel species of the genus Anaerotignum, for which the name Anaerotignum faecicola sp. nov. is proposed. The type strain is KGMB03357T (= KCTC 15736T = DSM 107953T).

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Salicibibacter halophilus sp. nov., a moderately halophilic bacterium isolated from kimchi: Young Joon Oh , Joon Yong Kim , Hyo Kyeong Park , Ja-Young Jang , Seul Ki Lim , Min-Sung Kwon , Hak-Jong Choi; J. Microbiol. 2019;57(11):997-1002. Published online October 28, 2019; DOI: https://doi.org/10.1007/s12275-019-9421-z

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A Gram-stain-positive, rod-shaped, alkalitolerant, and halophilic bacterium–designated as strain NKC3-5T–was isolated from kimchi that was collected from the Geumsan area in the Republic of Korea. Cells of isolated strain NKC3-5T were 0.5–0.7􍾘μm wide and 1.4–2.8 μm long. The strain NKC3-5T could grow at up to 20.0% (w/v) NaCl (optimum 10%), pH 6.5–10.0 (optimum pH 9.0), and 25–40°C (optimum 35°C). The cells were able to reduce nitrate under aerobic conditions, which is the first report in the genus Salicibibacter. The genome size and genomic G + C content of strain NKC3-5T were 3,754,174 bp and 45.9 mol%, respectively; it contained 3,630 coding sequences, 16S rRNA genes (six 16S, five 5S, and five 23S), and 59 tRNA genes. Phylogenetic analysis based on 16S rRNA showed that strain NKC- 3-5T clustered with bacterium Salicibibacter kimchii NKC1-1T, with a similarity of 96.2–97.6%, but formed a distinct branch with other published species of the family Bacillaceae. In addition, OrthoANI value between strain NKC3-5T and Salicibibacter kimchii NKC1-1T was far lower than the species demarcation threshold. Using functional genome annotation, the result found that carbohydrate, amino acid, and vitamin metabolism related genes were highly distributed in the genome of strain NKC3-5T. Comparative genomic analysis revealed that strain NKC3-5T had 716 pan-genome orthologous groups (POGs), dominated with carbohydrate metabolism. Phylogenomic analysis based on the concatenated core POGs revealed that strain NKC3-5T was closely related to Salicibibacter kimchii. The predominant polar lipids were phosphatidylglycerol and two unidentified lipids. Anteiso- C15:0, iso-C17:0, anteiso-C17:0, and iso-C15:0 were the major cellular fatty acids, and menaquinone-7 was the major isoprenoid quinone present in strain NKC3-5T. Cell wall peptidoglycan analysis of strain NKC3-5T showed that meso-diaminopimelic acid was the diagnostic diamino acid. The phenotypic, genomic, phylogenetic, and chemotaxonomic properties reveal that the strain represents a novel species of the genus Salicibibacter, for which the name Salicibibacter halophilus sp. nov. is proposed, with the type strain NKC3-5T (= KACC 21230T = JCM 33437T).

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Mucilaginibacter limnophilus sp. nov., isolated from a lake: Shih-Yi Sheu , Yi-Ru Xie , Wen-Ming Chen; J. Microbiol. 2019;57(11):967-975. Published online August 28, 2019; DOI: https://doi.org/10.1007/s12275-019-9146-z

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A polyphasic taxonomy approach was used to characterize strain YBJ-36T, isolated from a freshwater lake in Taiwan. Phylogenetic analyses, based on 16S rRNA gene sequences and coding sequences of an up-to-date bacterial core gene set (92 protein clusters), indicated that strain YBJ-36T formed a phylogenetic lineage in the genus Mucilaginibacter. 16S rRNA gene sequence similarity indicated that strain YBJ-36T is closely related to species within the genus Mucilaginibacter (93.8–97.8% sequence similarity) and is most similar to Mucilaginibacter fluminis TTM-2T (97.8%), followed by Mucilaginibacter roseus TTM-1T (97.2%). Microbiological analyses demonstrated that strain YBJ-36T is Gram-negative, aerobic, non-motile, rod-shaped, surrounded by a thick capsule, and forms pink-colored colonies. Strain YBJ-36T grew between 20–40°C (optimal range, 35–37°C), pH 5.5–7.0 (optimal pH of 6) and 0–2% NaCl (optimal concentration, 0.5%). The predominant fatty acids of strain YBJ-36T are iso-C15:0 and summed feature 3 (C16:1 ω7c and/or C16:1 ω6c), the major polar lipid is phosphatidylethanolamine, the major polyamine is homospermidine, and the major isoprenoid quinone is MK-7. The draft genome is approximately 4.63 Mb in size with a G+C content of 42.8 mol%. Strain YBJ-36T exhibited less than 35% DNA-DNA relatedness with Mucilaginibacter fluminis TTM-2T and Mucilaginibacter roseus TTM-1T. Based on phenotypic and genotypic properties and phylogenetic inference, strain YBJ-36T should be classified in a novel species of the genus Mucilaginibacter, for which the name Mucilaginibacter limnophilus sp. nov. is proposed. The type strain is YBJ-36T (= BCRC 81056T = KCTC 52811T = LMG 30058T).

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Cohnella abietis sp. nov., isolated from Korean fir (Abies koreana) rhizospheric soil of Halla mountain: Lingmin Jiang , Sophea Pheng , Keun Chul Lee , Se Won Kang , Jae Cheol Jeong , Cha Young Kim , Hyeong Cheol Park , Dae-Hyuk Kim , Suk Weon Kim , Song-Gun Kim , Jiyoung Lee; J. Microbiol. 2019;57(11):953-958. Published online August 28, 2019; DOI: https://doi.org/10.1007/s12275-019-9136-1

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A strictly aerobic, motile, endospore-forming, rod-shaped bacterium, designated HS21T, was isolated from rhizospheric soil of the Korean fir tree (Abies koreana) from Halla mountain on Jeju island, Korea. Growth of strain HS21T was observed at pH 6.0–8.0 (optimum: pH 7.0), 0–2% (w/v) NaCl and 4–30°C (optimum: 25°C). A comparative analysis of 16S rRNA gene sequences showed that strain HS21T was most closely related to Cohnella luojiensis HY-22RT (97.6%), followed by C. lupini RLAHU4BT (97.4%) and C. collisoli NKM- 5T (97.2%). The genome of strain HS21T comprised a circular chromosome of 7,059,027 bp with 44.8% G + C content. The DNA-DNA relatedness values between strain HS21T and C. luojiensis HY-22RT and C. lupini RLAHU4BT were 18.1% and 13.8%, respectively. The major cellular fatty acids (> 5%) of the isolate were anteiso-C15:0, iso-C16:0, C16:0, and iso-C15:0. The polar lipids present were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, lysylphosphatidylglycerol, and three unidentified aminophospholipids. Based on its phenotypic, phylogenetic, genomic, and chemotaxonomic properties, strain HS21T represents a novel species of the genus Cohnella, for which the name Cohnella abietis sp. nov. is proposed. The type strain is HS21T (= KCTC 43028T = CCTCC AB 2019010T).

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Cohnella fermenti sp. nov., isolated from a fermentation process
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Paenibacillus psychroresistens sp. nov., isolated from the soil of an Arctic glacial retreat: In-Tae Cha , Eui-Sang Cho , Yoo Kyung Lee , Seong Woon Roh , Myung-Ji Seo; J. Microbiol. 2019;57(7):569-574. Published online June 27, 2019; DOI: https://doi.org/10.1007/s12275-019-8666-x

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Strain ML311-T8T was isolated from a glacial retreat area in Svalbard, Norway, and was taxonomically characterized by a polyphasic approach. Upon phylogenetic analysis, strain ML311-T8T was clustered with Paenibacillus arcticus MME2_ R6T and P. contaminans CKOBP-6T with 98.3–98.6 and 93.5– 93.9% 16S rRNA gene sequence similarities, respectively. DNA-DNA hybridization values between strain ML311-T8T and P. arcticus MME2_R6T was 19.9%. The genomic DNA G+C content was 41.1 mol%. The isolated strain was Gramstain- positive, strictly aerobic and rod-shaped, and grew in 0–0.5% (w/v) NaCl, at 4–23°C and pH 6.0–10.0, with optimal growth in 0% (w/v) NaCl, at 20°C and pH 7.0–8.0. The predominant respiratory quinone of strain ML311-T8T was MK- 7 and the major fatty acids were anteiso-C15:0 and C16:0. The polar lipids of strain ML311-T8T were phosphatidylglycerol, phosphatidylethanolamine, diphosphatidylglycerol, three unidentified amino lipids, and three unidentified lipids. On the basis of polyphasic taxonomic analysis, the strain ML311-T8T is proposed to represent a novel species of the genus Paenibacillus, for which the name Paenibacillus psychroresistens sp. nov. is proposed. The type strain is ML311-T8T (= KCCM 43190T = JCM 31243T).

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Microbiodiversity Landscape Present in the Mine-Tailings of the “Sierra de Huautla” Biosphere Reserve, Mexico
Maikel Gilberto Fernández-López, Ayixon Sánchez-Reyes, Marcos Eduardo Rosas-Ramírez, Edgar Balcázar-López
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Paracoccus jeotgali sp. nov., isolated from Korean salted and fermented shrimp: Juseok Kim , Joon Yong Kim , Hye Seon Song , In-Tae Cha , Seong Woon Roh , Se Hee Lee; J. Microbiol. 2019;57(6):444-449. Published online May 27, 2019; DOI: https://doi.org/10.1007/s12275-019-8704-8

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A Gram-stain-negative and facultatively aerobic bacterium, designated as strain CBA4604T, was isolated from a traditional Korean salted and fermented shrimp food (saeu-jeot). Phylogenetic analysis based on 16S rRNA gene sequences showed that strain CBA4604T formed a clearly distinct phyletic lineage from closely related species within the genus Paracoccus. Strain CBA4604T was the most closely related to P. koreensis Ch05T (97.5% 16S rRNA gene sequence similarity) and other type strains (≤ 97.0%). The genome comprised a chromosome and two plasmids of 3,299,166 bp with 66.5% G+C content. The DNA-DNA relatedness values between strain CBA4604T and P. koreensis Ch05T, P. alcaliphilus DSM 8512T, and P. stylophorae KTW-16T were 30.5%, 22.9%, and 16.7%, respectively. Cells of the strain were short rod-shaped and oxidase- and catalase-positive. The growth of strain CBA- 4604T was observed at 10–40°C (optimum, 37°C), pH 6.0–10.0 (optimum, pH 7.0), and in the presence of 0–8.0% (w/v) NaCl (optimum, 0–2.0%). Strain CBA4604T contained ubiquinone 10 as the sole isoprenoid quinone and summed feature 8 (C18:1 ω7c/C18:1 ω6c) and C18:0 as the major cellular fatty acids. The polar lipids consisted of phosphatidylcholine, phosphatidylglycerol, diphosphatidylglycerol, phospholipid, an unidentified aminolipid, an unidentified glycolipid, and three unidentified lipids. Based on its phylogenetic, genomic, phenotypic, and chemotaxonomic features, we concluded that strain CBA- 4604T represents a novel species in the genus Paracoccus and we propose the name Paracoccus jeotgali sp. nov. The type strain is CBA4604T (= KACC 19579T = JCM 32510T).

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Bacteroides faecium sp. nov. isolated from human faeces
Juseok Kim, Hye Seon Song, Joon Yong Kim, Tae Woong Whon, Won-Hyong Chung, Young-Do Nam, Yoon-E Choi, Seong Woon Roh
International Journal of Systematic and Evolutionary Microbiology.2023;[Epub] CrossRef
ODFM, an omics data resource from microorganisms associated with fermented foods
Tae Woong Whon, Seung Woo Ahn, Sungjin Yang, Joon Yong Kim, Yeon Bee Kim, Yujin Kim, Ji-Man Hong, Hojin Jung, Yoon-E Choi, Se Hee Lee, Seong Woon Roh
Scientific Data.2021;[Epub] CrossRef
Flaviflexus ciconiae sp. nov., isolated from the faeces of the oriental stork, Ciconia boyciana
Jae-Yun Lee, Woorim Kang, Pil Soo Kim, So-Yeon Lee, Na-Ri Shin, Hojun Sung, June-Young Lee, Ji-Hyun Yun, Yun-Seok Jeong, Jeong Eun Han, Mi-Ja Jung, Dong-Wook Hyun, Hyun Sik Kim, Euon Jung Tak, Jin-Woo Bae
International Journal of Systematic and Evolutionary Microbiology.2020; 70(10): 5439. CrossRef
Paracoccus aeridis sp. nov., an indole-producing bacterium isolated from the rhizosphere of an orchid, Aerides maculosa
Anusha Rai, Smita N, Suresh G, Shabbir A, Deepshikha G, Sasikala Ch, Ramana Ch.V
International Journal of Systematic and Evolutionary Microbiology .2020; 70(3): 1720. CrossRef
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Bing Wang, Zhiqiang Sun, Zhu Yu
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International Journal of Systematic and Evolutionary Microbiology.2019; 69(9): 2948. CrossRef

Edaphovirga cremea gen. nov., sp. nov., isolated from the rhizospheric soil of Codonopsis clematidea: Jin-Yan Xue , Meng-Yue Zhang , Yu Zhang , Juan Cheng , Li-Cheng Liu , Ying-Ying Wu , Tian-Yuan Zhang , Yi-Xuan Zhang; J. Microbiol. 2019;57(5):337-342. Published online February 26, 2019; DOI: https://doi.org/10.1007/s12275-019-8408-0

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A Gram-negative, facultatively anaerobic, non-motile, nonspore- forming, coccoid or rod-shaped and creamy-pigmented bacterium, designated SYP-B2100T, was isolated from the rhizospheric soil of Codonopsis clematidea in the Xinjiang Uygur Autonomous Region, China. The optimal growth occurred at 28°C, pH 5.0, in the absence of NaCl. The cells tested positive in catalase and methyl red tests but negative in oxidase, urease, gelatinase, milk coagulation, and peptonisation, H2S production, nitrate reduction, and Voges-Proskauer tests. The major isoprenoid quinone was ubiquinone-8 (Q-8). The major cellular fatty acids were C16:0 and summed feature 8. The polar lipids consisted of diphosphatidylglycerol, phosphatidylethanolamine, and phosphatidylglycerol. The 16S rRNA gene sequence of strain SYP-B2100T was the most similar to that of Rahnella inusitata DSM 30078T (96.9%) within the family Enterobacteriaceae. The genomic DNA G+C content of strain SYP-B2100T was 50.3 mol%. The combined data from the phylogenetic, morphological, physiological, biochemical, and chemotaxonomic analyses presented in this study support the conclusion that strain SYP-B2100T represents a novel species of a new genus, for which the name Edaphovirga cremea gen. nov., sp. nov. is proposed; the type strain is SYPB2100T (= CGMCC 1.5857T = DSM 105170T = KCTC 62024T).

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Validation list no. 225: valid publication of new names and new combinations effectively published outside the IJSEM
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A non-motile, yellow-pigmented bacterial strain, designated IMCC34762T, was isolated from a freshwater sample collected from Lake Cheongpyeong in Korea. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain IMCC- 34762T formed a lineage within the genus Flavobacterium and was most closely related to F. pectinovorum DSM 6368T (98.3% sequence similarity), followed by F. piscis CCUG 60099T (98.3%), F. branchiicola 59B-3-09T (98.2%), and F. saccharophilum DSM 1811T (98.2%). The average nucleotide identity and the genome-to-genome distance between strain IMCC34762T and the closely related strains were 61–62% and 26–27%, respectively, indicating that IMCC34762T is a novel species of the genus Flavobacterium. The major fatty acids (> 5%) of strain IMCC34762T were summed feature 3 (C16:1 ω6c and/or C16:1 ω7c, 17.3%), iso-C15:0 (15.0%), iso-C15:0 G (9.0%), C15:0 ω6c (7.4%), iso-C15:0 (7.4%), and iso-C16:0 (5.3%). The major respiratory quinone and polyamine were MK-6 and sym-homospermidine, respectively. The major polar lipids were phosphatidylethanolamine, an unidentified aminophospholipid, and an unidentified lipid. The DNA G+C content of strain IMCC34762T was 34.4 mol%. Based on the taxonomic data presented in this study, strain IMCC34762T represents a novel species within the genus Flavobacterium, for which the name Flavobacterium aquariorum, sp. nov. is proposed. The type strain is IMCC34762T (= KACC 19725T = NBRC 113425T).

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Hyunyoung Jo, Miri S. Park, Yeonjung Lim, Ilnam Kang, Jang-Cheon Cho
Journal of Microbiology.2023; 61(5): 495. CrossRef
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Seomin Kang, Jae-Yun Lee, Jeong Eun Han, Yun-Seok Jeong, Do-Hun Gim, Jin-Woo Bae
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Chryseolinea soli sp. nov., isolated from soil: Shin Ae Lee , Yiseul Kim , Mee-Kyung Sang , Jaekyeong Song , Soon-Wo Kwon , Hang-Yeon Weon; J. Microbiol. 2019;57(2):122-126. Published online January 31, 2019; DOI: https://doi.org/10.1007/s12275-019-8562-4

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A yellow-colored bacterium with gliding motility, strain KIS68-18T, was isolated from a soil sample at Bijin Island in Tongyeong city, Republic of Korea. The cells were strictly aerobic, Gram-staining-negative, non-spore-forming, and rod-shaped. The strain grew at the range of 10–35°C (optimum, 25–30°C), pH 5.5–8.0 (optimum, 6.0–7.5), and 0–0.5% (w/v) NaCl. A phylogenetic analysis based on 16S rRNA gene sequences revealed that strain KIS68-18T was closely related to Chryseolinea serpens DSM 24574T (98.9%) and had low sequence similarities (below 92.6%) with other members of the family ‘Cytophagaceae’ in the phylum Bacteroidetes. The major respiratory quinone system was MK-7 and the predominant cellular fatty acids were C16:1 ω5c (38.8%), iso-C15:0 (18.5%), and summed feature 3 (C16:1 ω7c and/or C16:1 ω6c, 10.6%). The polar lipids consisted of phosphatidylethanolamine, one unidentified phospholipid, three unidentified aminophospholipids, two unidentified aminolipids, and five unidentified lipids. The DNA G + C content was 50.9%. Based on the phylogenetic, physiological, and chemotaxonomic data, stain KIS68-18T represents a novel species of the genus Chryseolinea, for which the name Chryseolinea soli sp. nov. is proposed. The type strain of Chryseolinea soli is KIS68-18T (= KACC 17327T = NBRC 113100T).

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Paraburkholderia lacunae sp. nov., isolated from soil near an artificial pond: Tingye Feng , Sang Eun Jeong , Jin Ju Lim , Seogang Hyun , Che Ok Jeon; J. Microbiol. 2019;57(4):232-237. Published online January 16, 2019; DOI: https://doi.org/10.1007/s12275-019-8463-6

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A Gram-stain-negative, strictly aerobic bacterial strain, designated strain S27T, was isolated from soil near an artificial pond in South Korea. Cells were non-motile short rods showing oxidase- and catalase-positive activities. Growth of strain S27T was observed at 20–40°C (optimum, 30°C), pH 5.0–7.0 (optimum, pH 6.0), and 0–0.5% (w/v) NaCl (optimum, 0%). Ubiquinone-8 was detected as the sole respiratory quinone and the major fatty acids were C16:0, cyclo-C17:0, and cyclo- C19:0 ω8c. The G + C content of the genomic DNA was 62.4 mol%. Phosphatidylglycerol, phosphatidylethanolamine, and an unidentified aminophospholipid were detected as the major polar lipids. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain S27T formed a clearly distinct phyletic lineage from closely related Paraburkholderia species within the genus Paraburkholderia. Strain S27T was most closely related to Paraburkholderia rhynchosiae WSM3937T, Paraburkholderia ginsengiterrae DCY85T, Paraburkholderia fungorum NBRC 102489T, and Paraburkholderia graminis C4D1MT with 98.8%, 98.4%, 98.4%, and 97.7% 16S rRNA gene sequence similarities, respectively. The DNA-DNA relatedness level between strain S27T and the type strain of P. rhynchosiae was 36.8 ± 2.6%. On the basis of phenotypic, chemotaxonomic and molecular properties, strain S27T represents a novel species of the genus Paraburkholderia, for which the name Paraburkholderia lacunae sp. nov. is proposed. The type strain is S27T (KACC 19714 T = JCM 32721T).

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International Committee on Systematics of Prokaryotes, Subcommittee on the taxonomy of Rhizobia and Agrobacteria, minutes of the annual meeting by videoconference, 5 July 2021, followed by online discussion until 31 December 2021
Seyed Abdollah Mousavi, J. Peter W. Young
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Flavisolibacter aluminii sp. nov., a novel member of the genus Flavisolibacter isolated from an automotive air conditioning system: Hyosun Lee , Dong-Uk Kim , Suyeon Lee , Song-Gun Kim , A-Young Park , Jae-Hyung Ahn , Jong-Ok Ka; J. Microbiol. 2019;57(1):18-22. Published online November 19, 2018; DOI: https://doi.org/10.1007/s12275-019-8219-3

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A Gram-stain-negative, aerobic, non-motile, rod-shaped, and yellow-pigmented bacterium, designated strain ID1709T, was isolated from an automotive air conditioning system collected in Korea. Analysis of 16S rRNA gene sequence similarity showed that strain ID1709T had 92.2–94.3% similarities with the type strains of members of the genus Flavisolibacter. The major cellular fatty acids were iso-C15:0, iso-C15:1 G, iso-C17:0 3-OH, and summed feature 3 (C16:1 ω7c and/or C16:1 ω6c). The predominant respiratory quinone was MK-7. The polar lipids comprised phosphatidylethanolamine, aminoglycophospholipid, two unidentified aminolipids, and three unidentified lipids. The DNA G + C content of the strain was 35.6 mol%. Based on phenotypic, chemotaxonomic, and genotypic data, strain ID1709T represents a novel species in the genus Flavisolibacter, for which the name Flavisolibacter aluminii sp. nov. (= KACC 19451T = KCTC 52778T = NBRC 112870T), is proposed.

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Insights into the Response and Evolution of Microbial Communities During Long-Term Natural Remediation of Contaminated Abandoned Shale Gas Wells
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Salicibibacter kimchii gen. nov., sp. nov., a moderately halophilic and alkalitolerant bacterium in the family Bacillaceae, isolated from kimchi: Ja-Young Jang , Young Joon Oh , Seul Ki Lim , Hyo Kyeong Park , Changsu Lee , Joon Yong Kim , Mi-Ai Lee , Hak-Jong Choi; J. Microbiol. 2018;56(12):880-885. Published online October 25, 2018; DOI: https://doi.org/10.1007/s12275-018-8518-0

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A moderately halophilic and alkalitolerant bacterial strain NKC1-1T was isolated from commercial kimchi in Korea. Strain NKC1-1T was Gram-stain-positive, aerobic, rod-shaped, non-motile, and contained diaminopimelic acid-type murein. Cell growth was observed in a medium containing 0–25% (w/v) NaCl (optimal at 10% [w/v]), at 20–40°C (optimal at 37°C) and pH 6.5–10.0 (optimal at pH 9.0). The major isoprenoid quinone of the isolate was menaquinone-7, and the major polar lipids were phosphatidylglycerol and unidentified phospholipids. Cell membrane of the strain contained iso-C17:0 and anteiso-C15:0 as the major fatty acids. Its DNA G + C content was 45.2 mol%. Phylogenetic analysis indicated the strain to be most closely related to Geomicrobium halophilum with 92.7–92.9% 16S rRNA gene sequence similarity. Based on polyphasic taxonomic evaluation with phenotypic, phylogenetic, and chemotaxonomic analyses, the strain represents a novel species in a new genus, for which the name Salicibibacter kimchii gen. nov., sp. nov. is proposed (= CECT 9537T; KCCM 43276T).

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Zunongwangia flava sp. nov., belonging to the family Flavobacteriaceae, isolated from Salicornia europaea: Eui-Sang Cho , In-Tae Cha , Hak-Jong Choi , Seong Woon Roh , Young-Do Nam , Sung Man Seo , Myung-Ji Seo; J. Microbiol. 2018;56(12):868-873. Published online October 25, 2018; DOI: https://doi.org/10.1007/s12275-018-8231-z

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A yellow pigmented bacterium designated strain MBLN094T within the family Flavobacteriaceae was isolated from a halophyte Salicornia europaea on the coast of the Yellow Sea. This strain was a Gram-stain negative, aerobic, non-spore forming, rod-shaped bacterium. Phylogenetic analysis of the 16S rRNA gene sequence of strain MBLN094T was found to be related to the genus Zunongwangia, exhibiting 16S rRNA gene sequence similarity values of 97.0, 96.8, 96.4, and 96.3% to Zunongwangia mangrovi P2E16T, Z. profunda SM-A87T, Z. atlantica 22II14-10F7T, and Z. endophytica CPA58T, respectively. Strain MBLN094T grew at 20‒37°C (optimum, 25‒ 30°C), at pH 6.0‒10.0 (optimum, 7.0‒8.0), and with 0.5‒15.0% (w/v) NaCl (optimum, 2.0‒5.0%). Menaquinone MK-6 was the sole respiratory quinone. The polar lipids were phosphatidylethanolamine, two unidentified aminolipids, and four unidentified lipids. Major fatty acids were iso-C17:0 3-OH, summed feature 3 (C16:1 ω6c and/or C16:1 ω7c), and iso-C15:0. The genomic DNA G + C content was 37.4 mol%. Based on these polyphasic taxonomic data, strain MBLN094T is considered to represent a novel species of the genus Zunongwangia, for which the name Zunongwangia flava sp. nov. is proposed. The type strain is MBLN094T (= KCTC 62279T = JCM 32262T).

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Sustainable agricultural management of saline soils in arid and semi-arid Mediterranean regions through halophytes, microbial and soil-based technologies
Salvadora Navarro-Torre, Pedro Garcia-Caparrós, Amaia Nogales, Maria Manuela Abreu, Erika Santos, Ana Lúcia Cortinhas, Ana Delaunay Caperta
Environmental and Experimental Botany.2023; 212: 105397. CrossRef
Winogradskyella vincentii sp. nov. and Winogradskyella alexanderae sp. nov., two novel bacteria isolated from intertidal sediment
Yu-Yan Yue, Yu-Qi Ye, Zi-Yang Zhou, Meng-Di Zhang, Ya-Wei Jia, Zong-Jun Du
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Validation List no. 206. Valid publication of new names and new combinations effectively published outside the IJSEM
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Roseovarius tibetensis sp. nov., a halophilic bacterium isolated from Lake LongmuCo on Tibetan Plateau: Hui-bin Lu , Xiao-feng Xue , Dorji Phurbu , Peng Xing , Qing-long Wu; J. Microbiol. 2018;56(11):783-789. Published online October 24, 2018; DOI: https://doi.org/10.1007/s12275-018-8178-0

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Two Gram-stain negative halophilic strains, designated as LM2T and LM4, were isolated from Lake LongmuCo on Tibetan Plateau. These two strains were aerobic, catalaseand oxidase- positive, nonmotile and rod-shaped organisms. Phylogenetic analysis based on 16S rRNA gene sequences indicated that LM2T and LM4 belong to the genus Roseovarius, with Roseovarius tolerans EL-172T (97.3% and 97.4% 16S rRNA gene sequence similarity, respectively) and Roseovarius azorensis SSW084T (95.5% and 95.6% 16S rRNA gene sequence similarity, respectively) as their closest neighbors. Q-10 was the sole respiratory quinone of these two strains. The major fatty acids were C18:1 ω7c/C18:1 ω6c, C16:0, C19:0 cyclo ω8c, and 11-methyl C18:1 ω7c. The polar lipids included phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine, phospholipid of unknown structure containing glucosamine, and unidentified aminolipid. The DNA G + C content was between 64.2 and 64.5 mol%. DNA-DNA hybridization showed 96.7% relatedness between LM2T and LM4, 24.9% relatedness between LM2T and R. tolerans EL-172T, and 36.3% relatedness between LM4 and R. tolerans EL-172T. Based on phylogenetic analysis, DNA-DNA hybridization, a range of physiological and biochemical characteristics, LM2T and LM4 belong to the same species and were clearly distinguished from the type strains of the genus Roseovarius. It was evident that LM2T and LM4 could be classified as a novel species of the genus Roseovarius, for which the name Roseovarius tibetensis sp. nov. is proposed. The type strain is LM2T (= CGMCC 1.16230T = KCTC 62028T).

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International Journal of Systematic and Evolutionary Microbiology .2025;[Epub] CrossRef
Lithoautotrophic lifestyle of the widespread genusRoseovariusrevealed by physiological and genomic characterization ofRoseovarius autotrophicussp. nov
Galina Slobodkina, Nataliya Ratnikova, Alexander Merkel, Vadim Kevbrin, Alexandra Kuchierskaya, Alexander Slobodkin
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Duganella rivus sp. nov., Duganella fentianensis sp. nov., Duganella qianjiadongensis sp. nov. and Massilia guangdongensis sp. nov., isolated from subtropical streams in China and reclassification of all species within genus Pseudoduganella
Hui-Bin Lu, Zhi-Peng Cai, Yong-Gang Yang, Mei-Ying Xu
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Massilia aquatica sp. nov., Isolated from a Subtropical Stream in China
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Peixin Gao, Huibin Lu, Peng Xing, Qinglong L. Wu
International Journal of Systematic and Evolutionary Microbiology .2020; 70(10): 5217. CrossRef
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Aestuariibaculum marinum sp. nov., a marine bacterium isolated from seawater in South Korea: Jiwon Choi , Dongwook Lee , Jun Hyeong Jang , Seho Cha , Taegun Seo; J. Microbiol. 2018;56(9):614-618. Published online August 23, 2018; DOI: https://doi.org/10.1007/s12275-018-8134-z

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A Gram-negative, non-motile, aerobic bacterium, designated strain IP7T, was isolated from seawater at the shore of the Incheon Eulwang-ri beach, South Korea. Cells of strain IP7T are straight or slightly rod-shaped and colonies are round, convex and orange-yellow. Strain IP7T is flexirubin-negative, mild halophile, catalase- and oxidase-positive, and produces a yellow-orange carotenoid pigment. Growth is optimal at 30°C, pH 7–9, and 2.0–4.0% NaCl (w/v). On the basis of 16S rRNA gene sequence similarity, strain IP7T is affiliated with genus Aestuariibaculum in the family Flavobacteriaceae, the closest relative being Aestuariibaculum suncheonense SC17T (98.3% sequence similarity). The DNA G + C content of the novel strain is 37.4 mol%. The only quinone is MK-6 menaquinone. Iso-branched C15:0, iso-branched C15:1 G, and iso-branched C17:0 3-OH are major fatty acids. The major polar lipids are phosphatidylethanolamine, an unidentified aminoglycolipid and two unidentified glycolipids. The DNA-DNA hybridization value of strain IP7T with Aestuariibaculum suncheonense SC17T is 28.87%. Based on the collective DNA-DNA hybridization, biochemical, phylogenetic and physiological data, we report a novel species of the genus Aestuariibaculum for which the name Aestuariibaculum marinum sp. nov. is proposed. The type strain is IP7T (= KCTC 52521T = JCM 31725T).

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International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
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International Journal of Systematic and Evolutionary Microbiology .2020; 70(10): 5382. CrossRef
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Brevibacterium anseongense sp. nov., isolated from soil of ginseng field: Mi-Seon Jung , Xiao-Tian Quan , Muhammad Zubair Siddiqi , Qingzhen Liu , Sang Yong Kim , Ji-Hyang Wee , Wan Taek Im; J. Microbiol. 2018;56(10):706-712. Published online August 22, 2018; DOI: https://doi.org/10.1007/s12275-018-8181-5

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A Gram-positive, aerobic, non-motile, pale-yellow, and rodshaped bacterium, designated as Gsoil 188T, was isolated from the soil of a ginseng field in Pocheon, South Korea. A phylogenetic analysis based on 16S rRNA gene sequence comparison revealed that the strain formed a distinct lineage within the genus Brevibacterium and was most closely related to B. epidermidis NBRC 14811T (98.4%), B. sediminis FXJ8.269T (98.2%), B. avium NCFB 3055T (98.1%), and B. oceani BBH7T (98.1%), while it shared less than 98.1% identity with the other species of this genus. The DNA G + C content was 68.1 mol%. The predominant quinone was MK-8(H2). The major fatty acids were anteiso-C15:0 and anteiso-C17:0. The cell wall peptidoglycan of strain Gsoil 188T contained meso-diaminopimelic acid. The major polar lipids were phosphatidylglycerol, diphosphatidylglycerol, and an unidentified aminolipid. The physiological and biochemical characteristics, low DNA-DNA relatedness values, and taxonomic analysis allowed the differentiation of strain Gsoil 188T from the other recognized species of the genus Brevibacterium. Therefore, strain Gsoil 188T represents a novel species of the genus Brevibacterium, for which the name Brevibacterium anseongense sp. nov. is proposed, with the type strain Gsoil 188T (= KACC 19439T = LMG 30331T).

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Leifsonia flava sp. nov., a novel actinobacterium isolated from the rhizosphere of Aquilegia viridiflora: Ying Cai , Wen-Zhen Tao , Yu-Jun Ma , Juan Cheng , Meng-Yue Zhang , Yi-Xuan Zhang; J. Microbiol. 2018;56(8):549-555. Published online July 25, 2018; DOI: https://doi.org/10.1007/s12275-018-8061-z

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SYP-B2174T is a yellow-pigmented, Gram-positive, non-motile, and rod-shaped actinobacterium isolated from the rhizospheric soil of Aquilegia viridiflora Pall. collected from the Xinjiang uygur autonomous region of China. The strain’s growth temperature ranges from 1 to 35°C, with an optimal growth being observed at 28°C. Growth occurs from 0 to 5% NaCl and at pH 6–8, with optimal growth being observed in 1% NaCl at pH 7. Comparative 16S rRNA gene sequencebased phylogenetic analysis placed the strain in a clade with the species Leifsonia kafniensis JCM 17021T and Leifsonia psychrotolerans DSM 22824T with similarities of 97.8 and 97.6%, respectively. The DNA-DNA hybridization values of the strain SYP-B2174T to its closest phylogenetic neighbors were significantly lower than 35.7%. The strain was identified as a novel species of the genus Leifsonia judging by the coryneform morphology, peptidoglycans based upon 2,4-diaminobutyric acid, principal phospholipids phosphatidylglycerol and diphosphatidylglycerol, major menaquinone MK-11, predominant fatty acids of anteiso-C15:0, anteiso-C17:0, and iso-C16:0, and a DNA G + C base composition of 68.7 mol%, for which the name Leifsonia flava sp. nov. is proposed. The type strain is SYP-B2174T (= CGMCC 1.15856T = DSM 105144T = KCTC 39963T).

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Halomonas tibetensis sp. nov., isolated from saline lakes on Tibetan Plateau: Hui-bin Lu , Peng Xing , Lei Zhai , Dorji Phurbu , Qian Tang , Qing-long Wu; J. Microbiol. 2018;56(7):493-499. Published online June 14, 2018; DOI: https://doi.org/10.1007/s12275-018-8076-5

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Strains pyc13T and ZGT13 were isolated from Lake Pengyan and Lake Zigetang on Tibetan Plateau, respectively. Both strains were Gram-negative, catalase- and oxidase-positive, aerobic, rod-shaped, nonmotile, and nonflagellated bacteria. Phylogenetic analysis based on 16S rRNA gene sequences showed that strains pyc13T and ZGT13 belong to the genus Halomonas, with Halomonas alkalicola 56-L4-10aEnT as their closest neighbor, showing 97.4% 16S rRNA gene sequence similarity. The predominant respiratory quinone of both strains was Q-9, with Q-8 as a minor component. The major fatty acids of both strains were C18:1 ω6c/C18:1 ω7c, C16:1 ω6c/C16:1 ω7c, C16:0, and C12:0 3OH. The polar lipids of both strains consisted of phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, glycolipid, phospholipids of unknown structure containing glucosamine, and unidentified phospholipids. The DNA G + C content of pyc13T and ZGT13 were 62.6 and 63.4 mol%, respectively. The DNA-DNA hybridization values of strain pyc13T were 34, 41, 61, 35, and 35% with the reference strains H. alkalicola 56-L4-10aEnT, H. sediminicola CPS11T, H. mongoliensis Z-7009T, H. ventosae Al12T, and H. fontilapidosi 5CRT, respectively. Phenotypic, biochemical, genotypic, and DNA-DNA hybridization data showed that strains pyc13T and ZGT13 represent a new species within the genus Halomonas, for which the name H. tibetensis sp. nov. is proposed. The type strain is pyc13T (= CGMCC 1.15949T = KCTC 52660T).

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Proposal of three novel species of soil bacteria, Variovorax ureilyticus, Variovorax rhizosphaerae, and Variovorax robiniae, in the family Comamonadaceae: Tuan Manh Nguyen , Ngoc Hoang Trinh , Jaisoo Kim; J. Microbiol. 2018;56(7):485-492. Published online June 14, 2018; DOI: https://doi.org/10.1007/s12275-018-8025-3

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Three novel bacterial strains (UCM-2T, UCM-G28T, and UCM-G35T) were obtained while isolating soil bacteria for the development of antibiotics. Cells of these strains were Gram-negative, non-spore forming, motile by means of a single flagellum, and rod shaped. In all strains, the predominant isoprenoid quinone was ubiquinone-8 (Q-8). Cells contained C16:0, summed feature 3 (C16:1 ω7c and/or C16:1 ω6c), summed feature 8 (C18:1 ω7c and/or C18:1 ω6c), and C17:0 cyclo as the major fatty acids, and C10:0 3-OH as the major hydroxy fatty acid. The polar lipid profiles of the three novel strains were dominated by diphosphatidylglycerol, phosphatidylethanolamine, and phosphatidylglycerol. The genomic DNA G + C contents of strains UCM-2T, UCM-G28T, and UCMG35T were 67.5, 65.9, and 66.4 mol%, respectively. Phylogenetic analyses based on 16S rRNA sequences showed that strain UCM-2T was most closely related to Variovorax soli NBRC 106424T, whereas strains UCM-G28T and UCM-G35T were most similar to Variovorax ginsengisoli Gsoil 3165T. Values indicating DNA-DNA hybridization between the novel isolates and closely related species in the genus Variovorax were lower than the 70% cut-off point. These phenotypic, chemotaxonomic, and phylogenetic data indicate that the three isolates should be classified as new members of the genus Variovorax, for which the names Variovorax ureilyticus sp. nov., Variovorax rhizosphaerae sp. nov., and Variovorax robiniae sp. nov. are proposed. The type strains are UCM-2T (= KACC 18899T = NBRC 112306T), UCMG28T (= KACC 18900T = NBRC 112307T), and UCM-G35T (= KACC 18901T = NBRC 112308T), respectively.

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Taxonomic description and draft genome of Pseudomonas sediminis sp. nov., isolated from the rhizospheric sediment of Phragmites karka: Pratiksha Behera , Madhusmita Mahapatra , Arman Seuylemezian , Parag Vaishampayan , V. Venkata Ramana , Neetha Joseph , Amaraja Joshi , Yogesh Shouche , Mrutyunjay Suar , Ajit K. Pattnaik , Gurdeep Rastogi; J. Microbiol. 2018;56(7):458-466. Published online June 14, 2018; DOI: https://doi.org/10.1007/s12275-018-7549-x

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The taxonomic position of a Gram-stain-negative, rod-shaped bacterial strain, designated PI11T , isolated from the rhizospheric sediment of Phragmites karka was characterized using a polyphasic approach. Strain PI11T could grow optimally at 1.0% NaCl concentration with pH 7.0 at 30°C and was positive for oxidase and catalase but negative for hydrolysis of starch, casein, and esculin ferric citrate. Phylogenetic analysis of 16S rRNA gene sequences indicated that the strain PI11T belonged to the genus Pseudomonas sharing the highest sequence similarities with Pseudomonas indoloxydans JCM 14246T (99.72%), followed by, Pseudomonas oleovorans subsp. oleovorans DSM 1045T (99.29%), Pseudomonas toyotomiensis JCM 15604T (99.15%), Pseudomonas chengduensis DSM 26382T (99.08%), Pseudomonas oleovorans subsp. lubricantis DSM 21016T (99.08%), and Pseudomonas alcaliphila JCM 10630T (99.01%). Experimental DNA-DNA relatedness between strain PI11T and P. indoloxydans JCM 14246T was 49.4%. The draft genome of strain PI11T consisted of 4,884,839 bp. Average nucleotide identity between the genome of strain PI11T and other closely related type strains ranged between 77.25–90.74%. The polar lipid pattern comprised of phosphatidylglycerol, diphosphatidylglycerol, and phosphatidylcholine. The major (> 10%) cellular fatty acids were C18:1 ω6c/ω7c, C16:1 ω6c/ω7c, and C16:0. The DNA G + C content of strain PI11T was 62.4 mol%. Based on the results of polyphasic analysis, strain PI11T was delineated from other closely related type strains. It is proposed that strain PI11T represents a novel species of the genus Pseudomonas, for which the name Pseudomonas sediminis sp. nov. is proposed. The type strain is PI11T (= KCTC 42576T = DSMZ 100245T).

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