Journal of Microbiology

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FunVIP: Fungal Validation and Identification Pipeline based on phylogenetic analysis: Chang Wan Seo, Shinnam Yoo, Yoonhee Cho, Ji Seon Kim, Martin Steinegger, Young Woon Lim; J. Microbiol. 2025;63(4):e2411017. Published online April 29, 2025; DOI: https://doi.org/10.71150/jm.2411017

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Abstract PDF Supplementary Material: The increase of sequence data in public nucleotide databases has made DNA sequence-based identification an indispensable tool for fungal identification. However, the large proportion of mislabeled sequence data in public databases leads to frequent misidentifications. Inaccurate identification is causing severe problems, especially for industrial and clinical fungi, and edible mushrooms. Existing species identification pipelines require separate validation of a dataset obtained from public databases containing mislabeled taxonomic identifications. To address this issue, we developed FunVIP, a fully automated phylogeny-based fungal validation and identification pipeline (https://github.com/Changwanseo/FunVIP). FunVIP employs phylogeny-based identification with validation, where the result is achievable only with a query, database, and a single command. FunVIP command comprises nine steps within a workflow: input management, sequence-set organization, alignment, trimming, concatenation, model selection, tree inference, tree interpretation, and report generation. Users may acquire identification results, phylogenetic tree evidence, and reports of conflicts and issues detected in multiple checkpoints during the analysis. The conflicting sample validation performance of FunVIP was demonstrated by re-iterating the manual revision of a fungal genus with a database with mislabeled sequences, Fuscoporia. We also compared the identification performance of FunVIP with BLAST and q2-feature-classifier with two mass double-revised fungal datasets, Sanghuangporus and Aspergillus section Terrei. Therefore, with its automatic validation ability and high identification performance, FunVIP proves to be a highly promising tool for achieving easy and accurate fungal identification.

Journal Articles

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
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

Description of Luteibacter aegosomatis sp. nov., Luteibacter aegosomaticola sp. nov., and Luteibacter aegosomatissinici sp. nov. isolated from the Intestines of Aegosoma sinicum Larvae: Hae-In Joe , Jee-Won Choi , June-Young Lee , Hojun Sung , Su-Won Jeong , Yun-Seok Jeong , Jae-Yun Lee , Jin-Woo Bae; J. Microbiol. 2023;61(6):603-613. Published online May 5, 2023; DOI: https://doi.org/10.1007/s12275-023-00051-7

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Abstract

Three novel bacterial strains, 321T, 335T, and 353T, were isolated from the intestines of Aegosoma sinicum larvae collected from Paju-Si, South Korea. The strains were Gram-negative, obligate aerobe and had rod-shaped cells with a single flagellum. The three strains belonged to the genus Luteibacter in the family Rhodanobacteraceae and shared < 99.2% similarity in their 16S rRNA gene sequence and < 83.56% similarity in thier whole genome sequence. Strains 321T, 335T, and 353T formed a monophyletic clade with Luteibacter yeojuensis KACC 11405T, L. anthropi KACC 17855T, and L. rhizovicinus KACC 12830T, with sequence similarities of 98.77–98.91%, 98.44–98.58%, and 97.88–98.02%, respectively. Further genomic analyses, including the construction of the Up-to-date Bacterial Core Gene (UBCG) tree and assessment of other genome-related indices, indicated that these strains were novel species belonging to the genus Luteibacter. All three strains contained ubiquinone Q8 as their major isoprenoid quinone and iso-C15:0 and summed feature 9 ( C16:0 10-methyl and/or iso-C17:1 ω9c) as their major cellular fatty acids. Phosphatidylethanolamine and diphosphatidylglycerol were the major polar lipids in all the strains. The genomic DNA G + C contents of strains 321T, 335T, and 353T were 66.0, 64.5, and 64.5 mol%, respectively. Based on multiphasic classification, strains 321T, 335T, and 353T were classified into the genus Luteibacter as the type strains of novel species, for which the names Luteibacter aegosomatis sp. nov., Luteibacter aegosomaticola sp. nov., and Luteibacter aegosomatissinici sp. nov. are proposed, respectively.

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Luteibacter sahnii sp. nov., A Novel Yellow-Colored Xanthomonadin Pigment Producing Probiotic Bacterium from Healthy Rice Seed Microbiome
Gagandeep Jaiswal, Rekha Rana, Praveen Kumar Nayak, Rekha Chouhan, Sumit G. Gandhi, Hitendra K. Patel, Prabhu B. Patil
Current Microbiology.2024;[Epub] CrossRef
Validation List no. 215. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2024;[Epub] CrossRef

Review

Influence of Microbiota on Vaccine Effectiveness: “Is the Microbiota the Key to Vaccine‑induced Responses?”: So-Hee Hong; J. Microbiol. 2023;61(5):483-494. Published online April 13, 2023; DOI: https://doi.org/10.1007/s12275-023-00044-6

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Abstract

Vaccines are one of the most powerful tools for preventing infectious diseases. To effectively fight pathogens, vaccines should induce potent and long-lasting immune responses that are specific to the pathogens. However, not all vaccines can induce effective immune responses, and the responses vary greatly among individuals and populations. Although several factors, such as age, host genetics, nutritional status, and region, affect the effectiveness of vaccines, increasing data have suggested that the gut microbiota is critically associated with vaccine-induced immune responses. In this review, I discuss how gut microbiota affects vaccine effectiveness based on the clinical and preclinical data, and summarize possible underlying mechanisms related to the adjuvant effects of microbiota. A better understanding of the link between vaccine-induced immune responses and the gut microbiota using high-throughput technology and sophisticated system vaccinology approaches could provide crucial insights for designing effective personalized preventive and therapeutic vaccination strategies.

Citations

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Parasite-microbiota interactions: a pathway to innovative interventions for Chagas disease, leishmaniasis, and ascariasis
Juan David Ramírez, Sergio Castañeda, Jill Weatherhead, Cristina Poveda
Future Microbiology.2025; 20(2): 149. CrossRef
Antibiotic-mediated dysbiosis leads to activation of inflammatory pathways
Jemma J. Taitz, Jian Tan, Duan Ni, Camille Potier-Villette, Georges Grau, Ralph Nanan, Laurence Macia
Frontiers in Immunology.2025;[Epub] CrossRef
Microbiome and mycobiome cross-talk from an immunobiotic perspective in COVID-19 and post-acute COVID-19 syndrome
Sunny Kumar, Zeel Bhatia, Sriram Seshadri
Exploration of Immunology.2025;[Epub] CrossRef
Gut Microbiota and Postbiotic Metabolites: Biotic Intervention for Enhancing Vaccine Responses and Personalized Medicine for Disease Prevention
Naheed Mojgani, Sumel Ashique, Mehran Moradi, Masoumeh Bagheri, Ashish Garg, Monika Kaushik, Md Sadique Hussain, Sabina Yasmin, Mohammad Yousuf Ansari
Probiotics and Antimicrobial Proteins.2025;[Epub] CrossRef
Intestinal Microbiota and Its Effect on Vaccine-Induced Immune Amplification and Tolerance
Yixin Liu, Jianfeng Zhou, Yushang Yang, Xiangzheng Chen, Longqi Chen, Yangping Wu
Vaccines.2024; 12(8): 868. CrossRef
Immune Cells, Gut Microbiota, and Vaccines: A Gender Perspective
Pierluigi Rio, Mario Caldarelli, Monica Chiantore, Francesca Ocarino, Marcello Candelli, Antonio Gasbarrini, Giovanni Gambassi, Rossella Cianci
Cells.2024; 13(6): 526. CrossRef
Ruhao Dashi granules exert therapeutic effects on H1N1 influenza virus infection by altering intestinal microflora composition
Wei Pan, Rui Wu, Qianyun Zhang, Yuan Ma, Jinxiang Xiang, Jingbo Wang, Jing Chen
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When inflammatory stressors dramatically change, disease phenotypes may transform between autoimmune hematopoietic failure and myeloid neoplasms
Xi-Chen Zhao, Bo Ju, Nuan-Nuan Xiu, Xiao-Yun Sun, Fan-Jun Meng
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Long Prime–Boost Interval and Heightened Anti-GD2 Antibody Response to Carbohydrate Cancer Vaccine
Irene Y. Cheung, Audrey Mauguen, Shakeel Modak, Ellen M. Basu, Yi Feng, Brian H. Kushner, Nai Kong Cheung
Vaccines.2024; 12(6): 587. CrossRef
Baseline Gut Microbiota Was Associated with Long-Term Immune Response at One Year Following Three Doses of BNT162b2
Li-Na Zhang, Jing-Tong Tan, Ho-Yu Ng, Yun-Shi Liao, Rui-Qi Zhang, Kwok-Hung Chan, Ivan Fan-Ngai Hung, Tommy Tsan-Yuk Lam, Ka-Shing Cheung
Vaccines.2024; 12(8): 916. CrossRef
Immunologische Konsequenzen bei frühgeborenen Kindern
Josina M. Hofer, Dimitra E. Zazara, Anke Diemert, Petra Clara Arck
Gynäkologische Endokrinologie.2023; 21(4): 261. CrossRef
Ginsenoside Rb1 enhanced immunity and altered the gut microflora in mice immunized by H1N1 influenza vaccine
Chuanqi Wan, Rufeng Lu, Chen Zhu, Haibo Wu, Guannan Shen, Yang Yang, Xiaowei Wu, Bangjiang Fang, Yuzhou He
PeerJ.2023; 11: e16226. CrossRef
Factors Influencing Microbiota in Modulating Vaccine Immune Response: A Long Way to Go
Francesca Romana Ponziani, Gaetano Coppola, Pierluigi Rio, Mario Caldarelli, Raffaele Borriello, Giovanni Gambassi, Antonio Gasbarrini, Rossella Cianci
Vaccines.2023; 11(10): 1609. CrossRef

Journal Articles

Core promoter mutation of nucleotides A1762T and G1764A of hepatitis B virus increases core promoter transactivation by hepatocyte nuclear factor 1: Mi So Seong , Hyeon Jeong Hwang , Eun Ah Jang , Jeong Ah Jang , Wah Wah Aung , Yi Yi Kyaw , JaeHun Cheong; J. Microbiol. 2022;60(10):1039-1047. Published online September 27, 2022; DOI: https://doi.org/10.1007/s12275-022-1675-1

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Abstract

Hepatitis B virus (HBV) infection highly increases the risk for liver cirrhosis and hepatocellular carcinoma (HCC). The clinical manifestation of HBV infection is determined by the mutual interplay of the viral genotype, host genetic factors, mode of transmission, adaptive mutations, and environmental factors. Core promoter activation plays a critical role in the pre-genomic RNA transcription of HBV for HBV replication. The mutations of core promoter have been implicated in HCC development. We had obtained HBV genes from Myanmar HBV infectants and identified gene variations at the core promoter region. For measuring the relative transactivation activity on core promoter, we prepared the core-promoter reporter construct. Both of A1762T and G1764A mutation were consistently found in the HBV genes with hepatocellular carcinoma. The A1762T/G1764A mutation was corresponding to K130M/V131I of HBx protein. We prepared the core promoter- luciferase reporter construct containing the double A1762T/G1764A mutation and the K130M/V131I HBx protein expression construct. The A1762T/G1764A mutation highly was responsive to core promoter transactivation by HBx, regardless of HBx mutation. The A1762T/G1764A mutation newly created hepatocyte nuclear factor 1 (HNF1) responsive element. Ectopic expression of HNF1 largely increased the HBV core promoter containing A1762T/G1764A mutation. In addition, hepatic rich fatty acid, palmitic acid and oleic acid, increased K130M/V131I HBx level by core promoter activation. These results provide biological properties and clinical significance of specific HBV core promoter mutants related with HCC development.

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A Survey of HBV Core/Pre-Core Mutations in Iraqi Patients with Chronic Hepatitis
Abdulhussain Kadhim Jwaziri, Maryam Esghaei, Mohammad Hadi Karbalaie Niya, Hadi Sayah, Mohammad Hossein Razizadeh, Ali Gholami, Leila Mousavizadeh, Hossein Keyvani
Hepatitis Monthly.2023;[Epub] CrossRef
The A1762T/G1764A mutations enhance HBV replication by alternating viral transcriptome
Danli Yang, Jun Zou, Guiwen Guan, Xiaoyu Feng, Ting Zhang, Guixin Li, Hui Liu, Huiling Zheng, Jingyuan Xi, Guangxin Yu, Lizhong Dai, Fengmin Lu, Xiangmei Chen
Journal of Medical Virology.2023;[Epub] CrossRef
Clinical application value of hepatitis B virus basal core promoter 1762/1764 and GGTII and GGT in patients with HBV-DNA-positive primary liver cancer
Shunhua Qiu, Lifen Jin, Dan Yang, Dewen Zhang
Medicine.2023; 102(43): e35699. CrossRef

Flaviflexus equikiangi sp. nov. isolated from faeces of Equus kiang (Tibetan wild ass) and carrying a class 1 integron gene cassette in its genome: Caixin Yang , Xingxing Lian , Yanpeng Cheng , Yifan Jiao , Jing Yang , Kui Dong , Shan Lu , Xin-He Lai , Dong Jin , Han Zheng , Ji Pu , Suping Wang , Liyun Liu , Jianguo Xu; J. Microbiol. 2022;60(6):585-593. Published online April 18, 2022; DOI: https://doi.org/10.1007/s12275-022-1673-3

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Abstract: Two Gram-stain-positive, catalase-negative, non-spore-forming, cocci-shaped strains (dk850T and JY899) were isolated from the feces of Equus kiang in the Qinghai-Tibet Plateau of China. 16S rRNA gene sequence-based phylogenetic analyses showed that strains dk850T and JY899 belong to the genus Flaviflexus, closest to F. salsibiostraticola KCTC 33148T, F. ciconiae KCTC 49253T and F. huanghaiensis H5T. The DNA G + C content of strain dk850T was 62.9%. The digital DNADNA hybridization values of strain dk850T with the closely related species were below the 70% threshold for species demarcation. The two strains grew best at 28°C on brain heart infusion (BHI) agar with 5% sheep blood. All strains had C18:1ω9c and C16:0 as the major cellular fatty acids. MK-9(H4) was the major menaquinone in strain dk850T. The major polar lipids included diphosphatidylglycerol and an unidentified phospholipid. Strains dk850T and JY899 were identified as carrying a class 1 integron containing the aminoglycoside resistance gene aadA11, both strains were resistant to spectinomycin and streptomycin. Based on several lines of evidence from phenotypic and phylogenetic analyses, strains dk850T and JY899 represent a novel species of the genus Flaviflexus, for which the name Flaviflexus equikiangi sp. nov. is proposed. The type strain is dk850T (= CGMCC 1.16593T = JCM 33598T).

Review

Prokaryotic DNA methylation and its functional roles: Hoon Je Seong , Sang-Wook Han , Woo Jun Sul; J. Microbiol. 2021;59(3):242-248. Published online February 23, 2021; DOI: https://doi.org/10.1007/s12275-021-0674-y

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Abstract

DNA methylation is known as a universal mechanism of epigenetic regulation in all kingdoms of life. Particularly, given that prokaryotes lack key elements such as histones and nucleosomes that can structurally modify DNA, DNA methylation is considered a major epigenetic regulator in these organisms. However, because DNA methylation studies have focused primarily on eukaryotes, the mechanism of prokaryotic DNA methylation has been less studied than in eukaryotes. DNA methylation in prokaryotes plays an important role in regulating not only the host defense system, but also the cell cycle, gene expression, and virulence that can respond directly to the environment. Recent advances in sequencing techniques capable of detecting methylation signals have allowed for the characterization of prokaryotic genome-wide epigenetic regulation. In this review, we describe representative examples of cellular events regulated by DNA methylation in prokaryotes, from early studies to current applications.

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Journal Articles

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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Abstract

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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International Journal of Systematic and Evolutionary Microbiology .2022;[Epub] CrossRef
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Yue Jiang, Yuxin Peng, Hyeon Ho Shin, Hyun Jung Kim, Ki-Hyun Kim, Lingmin Jiang, Jiyoung Lee, Zhun Li
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Yue Jiang, Lingmin Jiang, Yuxin Peng, Ki-Hyun Kim, Hyeon Ho Shin, Young-Min Kim, Jiyoung Lee, Zhun Li
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International Journal of Systematic and Evolutionary Microbiology .2021;[Epub] CrossRef
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Flavobacterium zhairuonensis sp. nov., a gliding bacterium isolated from marine sediment of the East China Sea: Sanjit Chandra Debnath , Ahmed Mohammed Abdo Miyah , Can Chen , Huan Sheng , Xue-Wei Xu , Yue-Hong Wu , Dao-Qiong Zheng , Jin-Zhong Xu , Ya-Nan Di , Pin-Mei Wang , Li Shen; J. Microbiol. 2019;57(12):1065-1072. Published online September 27, 2019; DOI: https://doi.org/10.1007/s12275-019-9194-4

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Abstract

A yellow pigmented, Gram-stain-negative, aerobic bacterium designated A5.7T was studied to evaluate the taxonomic position following the modern polyphasic approach. The strain was isolated from sediments near Zhairuo Island, which is situated in the East China Sea. Cells were non-spore forming rods without flagella but showed motility by gliding. Growth was observed at 15–35°C (optimum 28°C), pH 6.0–9.0 (optimum pH 6.5) and 0–2% (w/v) NaCl (optimum 0–0.5%) in LB broth. The major respiratory quinone of A5.7T was menaquinone 6. The major polar lipid of A5.7T was phosphatidylethanolamine and the predominant fatty acids (> 5%) were iso-C15:0, iso-C17:0 3-OH, C15:1 ω6c, iso-C15:0 3-OH, iso-C15:1 G, summed feature 3 (C16:1 ω7c and/or C16:1 ω6c) and summed feature 9 (iso-C17:1 ω9c and/or C16:0 10-methyl). Phylogenetic analysis based on 16S rRNA gene sequences showed that the isolate belongs to the genus Flavobacterium and shares the highest sequence similarities with Flavobacterium sharifuzzamanii A7.6T (98.5%), Flavobacterium tistrianum GB 56.1T (98.3%), Flavobacterium nitrogenifigens NXU-44T (97.8%), Flavobacterium anhuiense D3T (97.6%), Flavobacterium ginsenosidimutans THG 01T (97.6%), and Flavobacterium foetidum CJ42T (97.6%). Digital DNA-DNA hybridization and average nucleotide identity values between the strain and its closest phylogenetic neighbors showed the ranges from 19.6 to 34.1% and 73.7 to 87.9%, respectively. Therefore, based on polyphasic characteristics, strain A5.7T represents a novel species of the genus Flavobacterium for which the name Flavobacterium zhairuonensis sp. nov. is proposed. The type strain is A5.7T (= KCTC 62406T = MCCC 1K03494T).

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Sanjit Chandra Debnath, Can Chen, Ishrat Khan, Wen-Jie Wang, Dao-Qiong Zheng, Jin-Zhong Xu, Pin-Mei Wang
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Whole genome analysis of Aspergillus sojae SMF 134 supports its merits as a starter for soybean fermentation: Kang Uk Kim , Kyung Min Kim , Yong-Ho Choi , Byung-Serk Hurh , Inhyung Lee; J. Microbiol. 2019;57(10):874-883. Published online June 27, 2019; DOI: https://doi.org/10.1007/s12275-019-9152-1

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Abstract

Aspergillus sojae is a koji (starter) mold that has been applied for food fermentation in Asia. The whole genome of A. sojae SMF 134, which was isolated from meju (Korean soybean fermented brick), was analyzed at the genomic level to evaluate its potential as a starter for soybean fermentation. The genome size was 40.1 Mbp, which was expected to be composed of eight chromosomes with 13,748 ORFs. Strain SMF 134 had a total of 151 protease genes, among which two more leucine aminopeptidase (lap) genes were found in addition to the previously known lap1, and three γ-glutamyltranspeptidase (ggt) genes were newly identified. Such genomic characteristics of SMF 134 with many protease and flavor-related (lap and ggt) genes support its merits as a starter for soybean fermentation. In addition, this first complete genome of A. sojae will allow for further genetic studies to better understand the production of various enzymes, including proteases, LAPs, and GGTs, as well as other characteristics as a starter mold for soybean fermentation.

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A comprehensive in silico analysis of sortase superfamily: Adeel Malik , Seung Bum Kim; J. Microbiol. 2019;57(6):431-443. Published online May 27, 2019; DOI: https://doi.org/10.1007/s12275-019-8545-5

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Abstract

Sortases are cysteine transpeptidases that assemble surface proteins and pili in their cell envelope. Encoded by all Grampositive bacteria, few Gram-negative bacteria and archaea, sortases are currently divided into six classes (A-F). Due to the steep increase in bacterial genome data in recent years, the number of sortase homologues have also escalated rapidly. In this study, we used protein sequence similarity networks to explore the taxonomic diversity of sortases and also to evaluate the current classification of these enzymes. The resultant data suggest that sortase classes A, B, and D predominate in Firmicutes and classes E and F are enriched in Actinobacteria, whereas class C is distributed in both Firmicutes and Actinobacteria except Streptomyces family. Sortases were also observed in various Gram-negatives and euryarchaeota, which should be recognized as novel classes of sortases. Motif analysis around the catalytic cysteine was also performed and suggested that the residue at 2nd position from cysteine may help distinguish various sortase classes. Moreover, the sequence analysis indicated that the catalytic arginine is highly conserved in almost all classes except sortase F in which arginine is replaced by asparagine in Actinobacteria. Additionally, class A sortases showed higher structural variation as compared to other sortases, whereas inter-class comparisons suggested structures of class C and D2 exhibited best similarities. A better understanding of the residues highlighted in this study should be helpful in elucidating their roles in substrate binding and the sortase function, and successively could help in the development of strong sortase inhibitors.

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Jeanine F. Amacher, John M. Antos
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Mesorhizobium denitrificans sp. nov., a novel denitrifying bacterium isolated from sludge: Muhammad Zubair Siddiqi , Ngo Thi Phuong Thao , Gyumin Choi , Dae-Cheol Kim , Young-Woo Lee , Sang Young Kim , Ji-Hyang Wee , Wan-Taek Im; J. Microbiol. 2019;57(4):238-242. Published online March 30, 2019; DOI: https://doi.org/10.1007/s12275-019-8590-0

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Abstract

A Gram-stain-negative, non-spore-forming, facultative, rodshaped bacterium (designated LA-28T) was isolated from a sludge sample from a wastewater treatment plant in Hanam city, Republic of Korea. On the basis of 16S rRNA gene sequencing, strain LA-28T clustered with species of the genus Mesorhizobium and appeared closely related to M. jarvisii LMG 28313T (96.8%), M. waimense ICMP 19557T (96.7%), and M. huakuii LMG 14107T (96.7%). Growth occurs at 18– 40°C on R2A medium in the presence of 1–4% NaCl (w/v) and at pH 6–8. The DNA G+C content was 61.2 mol%, and the predominant quinone was ubiquinone-10 (Q-10). The major cellular fatty acids (> 5%) were C16:0, C19:0 ω8c cyclo, C18:1 ω7c 11-methyl, and C18:1 ω7c and/or C18:1 ω6c (summed feature 8). Major polar lipids were phosphatidylglycerol (PG), phosphatidylethanolamine (PE), phosphatidyl-N-methylethanolamine (PME), and phosphatidylcholine (PC). Physiological and biochemical characteristics indicated that strain LA-28T represents a novel species of the genus Mesorhizobium, for which the name Mesorhizobium denitrificans sp. nov. is proposed. The type strain is LA-28T (= KACC 19675T = LMG 30806T).

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Acinetobacter chinensis, a novel Acinetobacter species, carrying blaNDM-1, recovered from hospital sewage: Yiyi Hu , Yu Feng , Jiayuan Qin , Xiaoxia Zhang , Zhiyong Zong; J. Microbiol. 2019;57(5):350-355. Published online February 26, 2019; DOI: https://doi.org/10.1007/s12275-019-8485-0

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Abstract

Two strains of the genus Acinetobacter, named WCHAc- 010005 and WCHAc010052, were isolated from hospital sewage at West China Hospital in Chengdu, China. The two strains were found to be resistant to carbapenems due to the presence of carbapenemase gene blaNDM-1. Based on the comparative analysis of the rpoB sequence, the two strains formed a strongly supported and internally coherent cluster (intracluster identity of 98.7%), which was clearly separated from all known Acinetobacter species (≤ 83.4%). The two strains also formed a tight and distinct cluster based on the genuswide comparison of whole-cell mass fingerprints generated by MALDI-TOF mass spectrometry. In addition, the combination of their ability to assimilate malonate but not benzoate, and the inability to grow at 37°C could distinguish the two strains from all known Acinetobacter species. The two strains were subjected to whole genome sequencing using both short-read Illumina HiSeq2500 platform and the longread MinION sequencer. The average nucleotide identity and in silico DNA-DNA hybridization value between the genomes of WCHAc010005 and WCHAc010052 was 96.69% and 74.3% respectively, whereas those between the two genomes and the known Acinetobacter species were < 80% and < 30%, respectively. Therefore, the two strains represent a novel species of the genus Acinetobacter, for which the name Acinetobacter chinensis sp. nov. is proposed, and the type strain is WCHAc- 010005T (= GDMCC 1.1232T = KCTC 62813T).

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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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Abstract

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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Variation of cassiicolin genes among Chinese isolates of Corynespora cassiicola: Jun Wu , Xuewen Xie , Yanxia Shi , Ali Chai , Qi Wang , Baoju Li; J. Microbiol. 2018;56(9):634-647. Published online July 27, 2018; DOI: https://doi.org/10.1007/s12275-018-7497-5

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Abstract

Corynespora cassiicola is a species of fungus that is a plant pathogen of many agricultural crop plants, including severe target spot disease on cucumber. Cassiicolin is an important effector of pathogenicity of this fungus. In this study, we collected 141 Corynespora isolates from eighteen hosts, and the casscolin gene was detected in 82 C. cassiicola strains. The deduced protein sequences revealed that 72 isolates contained the Cas2 gene, two strains from Gynura bicolor harboured the Cas2.2 gene, and 59 isolates without a cassiicolin gene were classified as Cas0. Phylogenetic analyses was performed for the 141 isolates using four loci (ITS, ga4, caa5, and act1) and revealed two genetic clusters. Cluster A is composed of four subclades: subcluster A1 includes all Cas2 isolates plus 18 Cas0 strains, subcluster A2 includes the eight Cas5 isolates and one Cas0 isolate, and subclusters A3 and A4 contain Cas0 strains. Cluster B consists of 21 Cas0 isolates. Twenty-two C. cassiicola strains from different toxin classes showed varying degrees of virulence against cucumber. Cas0 or Cas2 strains induced diverse responses on cucumber, from no symptoms to symptoms of moderate or severe infection, but all Cas5 isolates exhibited avirulence on cucumber.

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