Journal of Microbiology

Journal Article

Pannonibacter tanglangensis sp. nov., a New Species Isolated from Pond Sediment: Lei Wang, Yanpeng Cheng, Panpan Yang, Jinjin Zhang, Gui Zhang, Sihui Zhang, Jing Yang, Zhen Zhang, Lulu Hu, Ji Pu, Yanying Yang, Xin-He Lai, Jianguo Xu, Yinghui Li, Qinghua Hu; J. Microbiol. 2024;62(9):727-737. Published online July 5, 2024; DOI: https://doi.org/10.1007/s12275-024-00151-y

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Abstract: Two bacterial strains (XCT-34^T and XCT-53) isolated from sediment samples of an artificial freshwater reservoir were analyzed using a polyphasic approach. The two isolates are aerobic, Gram-stain-negative, oxidase-negative, catalase-positive, motile with polar flagella, rod-shaped, and approximately 1.4-3.4 × 0.4-0.9 μm in size. Phylogenetic analyses based on 16S rRNA gene and whole-genome sequences showed that the two strains formed a distinct branch within the evolutionary radiation of the genus Pannonibacter, closest to Pannonibacter carbonis Q4.6^T (KCTC 52466). Furthermore, lower than threshold average nucleotide identity values (ANI, 85.7-86.4%) and digital DNA-DNA hybridization values (dDDH, 22.3-30.5%) of the two strains compared to the nearest type strains also confirmed that they represented a novel species. Genomic analyses, including annotation of the KEGG pathways, prediction of the secondary metabolism biosynthetic gene clusters and PHI phenotypes, supported functional inference and differentiation of the strains from the closely related taxa. Results of chemotaxonomic and physiological studies revealed that their distinct phenotypic characteristics distinguished them from existing Pannonibacter species. Thus, the two strains are considered to represent a novel species of Pannonibacter, for which the name of Pannonibacter tanglangensis sp. nov. is proposed, with XCT-34^T (= KCTC 82332^T = GDMCC 1.1947^T) as the respective type strain.

Reviews

Denitrifying Woodchip Bioreactors: A Microbial Solution for Nitrate in Agricultural Wastewater—A Review: Sua Lee , Min Cho , Michael J. Sadowsky , Jeonghwan Jang; J. Microbiol. 2023;61(9):791-805. Published online August 18, 2023; DOI: https://doi.org/10.1007/s12275-023-00067-z

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Nitrate ( NO3 −) is highly water-soluble and considered to be the main nitrogen pollutants leached from agricultural soils. Its presence in aquatic ecosystems is reported to cause various environmental and public health problems. Bioreactors containing microbes capable of transforming NO3 − have been proposed as a means to remediate contaminated waters. Woodchip bioreactors (WBRs) are continuous flow, reactor systems located below or above ground. Below ground systems are comprised of a trench filled with woodchips, or other support matrices. The nitrate present in agricultural drainage wastewater passing through the bioreactor is converted to harmless dinitrogen gas ( N2) via the action of several bacteria species. The WBR has been suggested as one of the most cost-effective NO3 −-removing strategy among several edge-of-field practices, and has been shown to successfully remove NO3 − in several field studies. NO3 − removal in the WBR primarily occurs via the activity of denitrifying microorganisms via enzymatic reactions sequentially reducing NO3 − to N2. While previous woodchip bioreactor studies have focused extensively on its engineering and hydrological aspects, relatively fewer studies have dealt with the microorganisms playing key roles in the technology. This review discusses NO3 − pollution cases originating from intensive farming practices and N-cycling microbial metabolisms which is one biological solution to remove NO3 − from agricultural wastewater. Moreover, here we review the current knowledge on the physicochemical and operational factors affecting microbial metabolisms resulting in removal of NO3 − in WBR, and perspectives to enhance WBR performance in the future.

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Complete genome sequence of Neobacillus sp. strain OS1-2, a denitrifying bacterium isolated from apple orchard soil
Jinwoo Ahn, Jeonghwan Jang, Elinne Becket
Microbiology Resource Announcements.2025;[Epub] CrossRef
Dissimilatory nitrate reductions in soil Neobacillus and Bacillus strains under aerobic condition
Seohyun Ahn, Min Cho, Michael J. Sadowsky, Jeonghwan Jang
Journal of Microbiology.2025; 63(2): e2411019. CrossRef
Mn-oxidizing microalgae and woodchip-denitrifying bioreactor system for recovering manganese and removing nitrogen from electrolytic manganese metal industrial tailwater
Xinyue Gong, Qin Peng, Ruixin Jiang, Na Yang, Cijun Xing, Rui Wang
Journal of Hazardous Materials.2025; 488: 137383. CrossRef

Apoptotic Factors, CaNma111 and CaYbh3, Function in Candida albicans Filamentation by Regulating the Hyphal Suppressors, Nrg1 and Tup1: Suyoung Kim , Se Hyeon Kim , Eunjoong Kweon , Jinmi Kim; J. Microbiol. 2023;61(4):403-409. Published online March 27, 2023; DOI: https://doi.org/10.1007/s12275-023-00034-8

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Abstract: The morphological switch from the yeast to hyphal form is a key virulence attribute of the opportunistic fungal pathogen, Candida albicans. Our recent report showed that deletion of the newly identified apoptotic factor, CaNma111 or CaYbh3, leads to hyperfilamentation and increased virulence in a mouse infection model. CaNma111 and CaYbh3 are homologs of the pro-apoptotic protease, HtrA2/Omi, and BH3-only protein, respectively. In this study, we examined the effects of CaNMA111 and CaYBH3 deletion mutations on the expression levels of the hypha-specific transcr!ption factors, Cph1 (a hyphal activator), Nrg1 (a hyphal repressor), and Tup1 (a hyphal repressor). The protein levels of Nrg1 were decreased in Caybh3/Caybh3 cells while those of Tup1 were decreased in both Canma111/Canma111 and Caybh3/Caybh3 cells. These effects on Nrg1 and Tup1 proteins were retained during serum-induced filamentation and appear to explain the hyperfilamentation phenotypes of the CaNMA111 and CaYBH3 deletion mutants. Treatment with the apoptosis-inducing dose of farnesol decreased the Nrg1 protein levels in the wild-type strain and more evidently in Canma111/Canma111 and Caybh3/Caybh3 mutant strains. Together, our results suggest that CaNma111 and CaYbh3 are key regulators of Nrg1 and Tup1 protein levels in C. albicans.

Journal Articles

Sala cibi gen. nov., sp. nov., an extremely halophilic archaeon isolated from solar salt: Hye Seon Song , Juseok Kim , Yeon Bee Kim , Se Hee Lee , Tae Woong Whon , Seong Woon Roh; J. Microbiol. 2022;60(9):899-904. Published online July 14, 2022; DOI: https://doi.org/10.1007/s12275-022-2137-5

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Abstract

Two novel halophilic archaeal strains, CBA1133T and CBA- 1134, were isolated from solar salt in South Korea. The 16S rRNA gene sequences of the isolates were identical to each other and were closely related to the genera Natronomonas (92.3–93.5%), Salinirubellus (92.2%), Halomarina (91.3– 92.0%), and Haloglomus (91.4%). The isolated strains were coccoid, Gram-stain-negative, aerobic, oxidase-positive, and catalase-negative. Growth occurred under temperatures of 25–50°C (optimum, 45°C), NaCl levels of 10–30% (optimum, 15%), pH levels of 6.0–8.5 (optimum, 7.0), and MgCl2 concentrations of 0–500 mM (optimum, 100 mM). Digital DNADNA hybridization values between the strains and related genera ranged from 18.3% to 22.7%. The major polar lipids of the strains were phosphatidyl glycerol, phosphatidyl glycerol phosphate methyl ester, and phosphatidyl glycerol sulfate. Genomic, phenotypic, physiological, and biochemical analyses of the isolates revealed that they represent a novel genus and species in the family Halobacteriaceae. The type strain is CBA1133T (= KACC 22148T = JCM 34265T), for which the name Sala cibi gen. nov., sp. nov. is proposed.

Citations

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Dominance and diversity of archaea in food-grade salts: insights for histamine degradation in salt-fermented foods
Jing Hou, Ya-Ling Mao, Na Li, Xiao-Yan Yang, Chidiebele Nwankwo, Heng-Lin Cui
International Journal of Food Science and Technology.2024; 59(12): 9490. 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
Journal of Microbiology.2024; 62(9): 739. CrossRef
Genome-based classification of genera Halosegnis and Salella, and description of four novel halophilic archaea isolated from a tidal flat
Yao Hu, Xue Ma, Shun Tan, Xin-Xin Li, Mu Cheng, Jing Hou, Heng-Lin Cui
Antonie van Leeuwenhoek.2024;[Epub] CrossRef
Assessing the impact of heavy metals on bacterial diversity in coastal regions of Southeastern India
Chandra Veluchamy, Avinash Sharma, Kalaivani Thiagarajan
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Proposal of Eoetvoesiella gen. nov., Paludihabitans gen. nov., Rivihabitans gen. nov. and Salella gen. nov. as replacement names for the illegitimate prokaryotic generic names Eoetvoesia, Paludicola, Rivicola and Sala, respectively
Umakant Bhoopati Deshmukh, Aharon Oren
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Validation List no. 209. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2023;[Epub] CrossRef
Halorarius litoreus gen. nov., sp. nov., Halorarius halobius sp. nov., Haloglomus halophilum sp. nov., Haloglomus salinum sp. nov., and Natronomonas marina sp. nov., extremely halophilic archaea isolated from tidal flat and marine solar salt
Ya-Ping Sun, Bei-Bei Wang, Zhang-Ping Wu, Xi-Wen Zheng, Jing Hou, Heng-Lin Cui
Frontiers in Marine Science.2023;[Epub] CrossRef
Naming new taxa of prokaryotes in the 21st century
Aharon Oren
Canadian Journal of Microbiology.2023; 69(4): 151. CrossRef

Isolation of a novel Lactiplantibacillus plantarum strain resistant to nitrite stress and its transcriptome analysis: Chae Young Kwon , Kyoung Jin Choi , Dongeun Yong , Ji-Eun Kim , Sang Sun Yoon; J. Microbiol. 2022;60(7):715-726. Published online July 4, 2022; DOI: https://doi.org/10.1007/s12275-022-2221-x

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Abstract: Nitric oxide (NO) is a reactive nitrogen species (RNS) that plays a vital role in regulating inflammatory processes. Under abnormal conditions, excessive NO levels can promote the oxidation of cellular components, which may cause or exacerbate diseases such as hypertension, cardiovascular dysfunction, and inflammatory bowel disease (IBD). Previous studies have shown that reducing NO levels in the lumen can attenuate the clinical symptoms of IBD. Thus, we aimed to identify bacteria that can reduce RNS and that can be used as valuable probiotics. In this study, we isolated bacteria resistant to nitrite stress from human feces and used 16S and whole-genome sequencing to identify them as Lactiplantibacillus plantarum LP7 (LP7). The ability to survive at high nitrite levels and to decrease them was greater in the LP7 strain than in the reference strain L. plantarum ATCC14917 (ATCC- 14917). To characterize the LP7 genome in more detail, we performed a comparative genome analysis. However, the unique genes that directly confer the ability to withstand nitrite stress were not present in the LP7 genome. Furthermore, we performed transcriptomic analysis of LP7 and ATCC14917 cells treated with nitrite. We found that the expression levels of genes involved in the cell division process were induced in LP7, which showed a more regular rod-shape than ATCC- 14917. This could explain why LP7 can survive better than ATCC14917 under nitrite stress. Based on its ability to survive better in nitrite stress and decrease nitrite concentration, we suggest that LP7 could be a valuable probiotic strain.

Extracellular vesicles derived from Lactobacillus plantarum restore chemosensitivity through the PDK2-mediated glucose metabolic pathway in 5-FU-resistant colorectal cancer cells: JaeJin An , Eun-Mi Ha; J. Microbiol. 2022;60(7):735-745. Published online July 4, 2022; DOI: https://doi.org/10.1007/s12275-022-2201-1

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Abstract

Metabolic abnormalities are one of the main hallmarks of cancer and are associated with chemoresistance. Therefore, targeting the metabolic reprogramming of cancer cells has the potential to overcome chemoresistance. Probiotic-derived extracellular vesicles (EVs) play important roles in biological function and intracellular communication. However, the inhibitory effect of Lactobacillus plantarum-derived EVs (LpEVs) on colorectal cancer (CRC) cells has not yet been elucidated. This study clearly revealed that increased glycolysis in 5-fluorouracil (5-FU)-resistant CRC cells (CRC/5FUR) is directly related to chemoresistance and that the metabolic shift reversed by LpEVs inhibits cancer cell proliferation and eventually leads to apoptosis. Pyruvate dehydrogenase kinase 2 (PDK2), one of the crucial enzymes for enhancing glycolysis, was upregulated in CRC/5FUR cells. In our study, LpEVs sensitized CRC/5FUR cells to 5-FU by attenuating PDK2 expression in p53-p21-dependent metabolic signaling, thereby circumventing 5-FU resistance. We demonstrated the effect of cellular responses to 5-FU by modifying the PDK2 expression level in both 5-FU-sensitive parental CRC and 5- FU resistant CRC cell lines. Finally, we revealed that the PDK2 signaling pathway can potentially be targeted using LpEVs treatment to overcome chemoresistant CRC, thereby providing a potential strategy for CRC treatment by intervening in tumor metabolism.

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Guangzhao Wang, Yang Wang, Kangliang Sheng, Yongzhong Wang
Journal of the Science of Food and Agriculture.2025;[Epub] CrossRef
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Tina Vida Plavec, Kristina Žagar Soderžnik, Giulia Della Pelle, Špela Zupančič, Robert Vidmar, Aleš Berlec
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Joshua Tobias, Stefan Heinl, Kristina Dendinovic, Ajša Ramić, Anna Schmid, Catherine Daniel, Ursula Wiedermann
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Carol Costa Encarnação, Giselle Marianne Faria, Victor Aguiar Franco, Luiz Gabriel Xavier Botelho, João Alfredo Moraes, Mariana Renovato-Martins
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Extracellular Vesicles from Lacticaseibacillus Paracasei PC-H1 Inhibit HIF-1α-Mediated Glycolysis of Colon Cancer
Yangqian Shi, Chunliang Zhang, Wanyu Cao, Luyi Li, Kaili Liu, Hanyue Zhu, Fikadu Balcha, Yong Fang
Future Microbiology.2024; 19(3): 227. CrossRef
Role of probiotic extracellular vesicles in inter-kingdom communication and current technical limitations in advancing their therapeutic utility
Rahul Sanwlani, Kyle Bramich, Suresh Mathivanan
Extracellular Vesicles and Circulating Nucleic Acids.2024; : 609. CrossRef
Beneficial microbiome and diet interplay in early-onset colorectal cancer
Zhengyuan Zhou, Linda Kleis, Ana Depetris-Chauvin, Stefanie Jaskulski, Victoria Damerell, Karin B Michels, Biljana Gigic, Ute Nöthlings, Gianni Panagiotou
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Sihyun Jeong, Yuju Kim, Soyeong Park, Doyeon Lee, Juho Lee, Shwe Phyu Hlaing, Jin-Wook Yoo, Sang Hoon Rhee, Eunok Im
Molecules.2023; 28(4): 1890. CrossRef
Extracellular Vesicles of Probiotics: Shedding Light on the Biological Activity and Future Applications
Paweł Krzyżek, Beatrice Marinacci, Irene Vitale, Rossella Grande
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Monisha Samuel, Rahul Sanwlani, Mohashin Pathan, Sushma Anand, Ella L. Johnston, Ching-Seng Ang, Maria Kaparakis-Liaskos, Suresh Mathivanan
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Integrated proteomic and metabolomic analyses reveal significant changes in chloroplasts and mitochondria of pepper (Capsicum annuum L.) during Sclerotium rolfsii infection: Hongdong Liao , Xiangyu Wen , Xuelei Deng , Yonghong Wu , Jianping Xu , Xin Li , Shudong Zhou , Xuefeng Li , Chunhui Zhu , Feng Luo , Yanqing Ma , Jingyuan Zheng; J. Microbiol. 2022;60(5):511-525. Published online March 31, 2022; DOI: https://doi.org/10.1007/s12275-022-1603-4

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Abstract

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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Multifaceted chemical and bioactive features of Ag@TiO2 and Ag@SeO2 core/shell nanoparticles biosynthesized using Beta vulgaris L. extract
Khaled M. Elattar, Fatimah O. Al-Otibi, Mohammed S. El-Hersh, Attia A. Attia, Noha M. Eldadamony, Ashraf Elsayed, Farid Menaa, WesamEldin I.A. Saber
Heliyon.2024; 10(7): e28359. CrossRef
Fighting for Survival at the Stomatal Gate
Maeli Melotto, Brianna Fochs, Zachariah Jaramillo, Olivier Rodrigues
Annual Review of Plant Biology .2024; 75(1): 551. CrossRef
Zinc and Boron Soil Applications Affect Athelia rolfsii Stress Response in Sugar Beet (Beta vulgaris L.) Plants
Tamalika Bhadra, Chandan Kumar Mahapatra, Md. Hosenuzzaman, Dipali Rani Gupta, Abeer Hashem, Graciela Dolores Avila-Quezada, Elsayed Fathi Abd_Allah, Md. Anamul Hoque, Swapan Kumar Paul
Plants.2023; 12(19): 3509. CrossRef
Genetic Regulation, Environmental Cues, and Extraction Methods for Higher Yield of Secondary Metabolites in Capsicum
Khushbu Islam, Abdul Rawoof, Ajay Kumar, John Momo, Ilyas Ahmed, Meenakshi Dubey, Nirala Ramchiary
Journal of Agricultural and Food Chemistry.2023; 71(24): 9213. CrossRef
Integrated pathological, proteomic and metabolomic analyses reveal significant changes of Eriocheir sinensis hepatopancreatic in response to the microsporidian Hepatospora eriocheir infection
Libo Hou, Mengdi Wang, Hao Li, Lei Zhu, Xianghui Kong, Wei Gu, Keran Bi, Jie Du, Qingguo Meng
Aquaculture.2023; 577: 739994. CrossRef

Changpingibacter yushuensis gen. nov., sp. nov., isolated from fluvial sediment in Qinghai Tibet Plateau of China: Yifan Jiao , Sihui Zhang , Jing Yang , Xin-He Lai , Kui Dong , Yanpeng Cheng , Mingchao Xu , Wentao Zhu , Shan Lu , Dong Jin , Ji Pu , Ying Huang , Liyun Liu , Suping Wang , Jianguo Xu; J. Microbiol. 2022;60(2):147-155. Published online January 7, 2022; DOI: https://doi.org/10.1007/s12275-022-1199-8

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Abstract

Two facultatively anaerobic, short rod-shaped, non-motile, Gram-stain-positive, unknown bacterial strains (JY-X040T and JY-X174) were isolated from fluvial sediments of Tongtian River in Yushu Tibetan Autonomous Prefecture, Qinghai province, China. Cells formed translucent, gray, round and convex colonies, with a diameter of less than 0.5 mm after 5 days of incubation at 30°C on brain heart infusion-5% sheep blood agar. The 16S rRNA gene sequence similarity between strain JY-X040T and Fudania jinshanensis 313T is 93.87%. In the four phylogenetic trees constructed based on the 16S rRNA gene and 423 core genes, the two isolates form an independent branch, phylogenetically closest to F. jinshanensis 313T, but could not be classified as a member of the genus Fudania or any other genus of the family Arcanobacteriaceae. The DNA G + C content of strain JY-X040T was 57.8%. Calculation
results
of average nucleotide identity, digital DNADNA hybridization value and amino acid identity between strain JY-X040T and F. jinshanensis 313T are 69.9%, 22.9%, and 64.1%. The major cellular fatty acids were C16:0 (23%) and C18:1ω9c (22%). The cell-wall peptidoglycan type was A5α (L-Lys-L-Ala-L-Lys-D-Glu). The polar lipids comprised diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol, phosphatidylinositol mannoside and four unidentified components. The whole-cell sugars contained rhamnose and ribose. MK-10(H4) was the sole respiratory quinone. The minimum inhibitory concentration of streptomycin was 32 μg/ml. All physiological, biochemical, chemotaxonomic and genomic characteristics support that strains JY-X040T and JY-X174 represent members of a novel species in a new genus, Changpingibacter yushuensis gen. nov., sp. nov. The type strain is JY-X040T (GDMCC 1.1996T = KCTC 49514T).

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Metagenomic and Culturomics Analysis of Microbial Communities within Surface Sediments and the Prevalence of Antibiotic Resistance Genes in a Pristine River: The Zaqu River in the Lancang River Source Region, China
Yi Yan, Jialiang Xu, Wenmin Huang, Yufeng Fan, Zhenpeng Li, Mingkai Tian, Jinsheng Ma, Xin Lu, Jian Liang
Microorganisms.2024; 12(5): 911. CrossRef
Bacterial diversity in arboreal ant nesting spaces is linked to colony developmental stage
Maximilian Nepel, Veronika E. Mayer, Veronica Barrajon-Santos, Dagmar Woebken
Communications Biology.2023;[Epub] CrossRef

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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Abstract

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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Focused Overview of Mycobacterium tuberculosis VapBC Toxin–Antitoxin Systems Regarding Their Structural and Functional Aspects: Including Insights on Biomimetic Peptides
Sung-Min Kang
Biomimetics.2023; 8(5): 412. CrossRef
Functional characterization of HigBA toxin-antitoxin system in an Arctic bacterium, Bosea sp. PAMC 26642
Eunsil Choi, Ahhyun Huh, Changmin Oh, Jeong-Il Oh, Ho Young Kang, Jihwan Hwang
Journal of Microbiology.2022; 60(2): 192. CrossRef
Identification and characterization of the type II toxin-antitoxin systems in the carbapenem-resistant Acinetobacter baumannii
Alireza Japoni-Nejad, Elnaz Harifi Mood, Parastoo Ehsani, Soroush Sardari, Fatemah Sadeghpour Heravi, Saeid Bouzari, Nader Shahrokhi
Microbial Pathogenesis.2021; 158: 105052. CrossRef

Thermococcus indicus sp. nov., a Fe(III)-reducing hyperthermophilic archaeon isolated from the Onnuri Vent Field of the Central Indian Ocean ridge: Jae Kyu Lim , Yun Jae Kim , Jhung-Ahn Yang , Teddy Namirimu , Sung-Hyun Yang , Mi-Jeong Park , Yong Min Kwon , Hyun Sook Lee , Sung Gyun Kang , Jung-Hyun Lee , Kae Kyoung Kwon; J. Microbiol. 2020;58(4):260-267. Published online April 1, 2020; DOI: https://doi.org/10.1007/s12275-020-9424-9

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Abstract

A strictly anaerobic, dissimilatory Fe(III)-reducing hyperthermophilic archaeon, designated as strain IOH1T, was isolated from a new deep-sea hydrothermal vent (Onnuri Vent Field) area in the Central Indian Ocean ridge. Strain IOH1T showed > 99% 16S rRNA gene sequence similarity with Thermococcus celericrescens TS2T (99.4%) and T. siculi DSM 12349T (99.2%). Additional three species T. barossii SHCK-94T (99.0%), T. celer Vu13T (98.8%), and T. piezophilus (98.6%) showed > 98.6% of 16S rRNA gene sequence similarity, however, the maximum OrthoANI value is 89.8% for the genome of T. celericrescens TS2T. Strain IOH1T cells are coccoid, 1.2–1.8 μm in diameter, and motile by flagella. Growth was at 70–82°C (optimum 80°C), pH 5.4–8.0 (optimum pH 6.0) with 2–4% (optimum 3%) NaCl. Growth of strain IOH1T was enhanced by starch, pyruvate, D(+)-maltose and maltodextrin as a carbon sources, and elemental sulfur as an electron acceptor; clearly different from those of related species T. celecrescens DSM 17994T and T. siculi DSM 12349T. Strain IOH1T, T. celercrescence DSM 17994T, and T. siculi DSM 12349T reduced soluble Fe(III)-citrate present in the medium, whereas the amount of total cellular proteins increased with the concomitant accumulation of Fe(II). We determined a circular chromosome of 2,234 kb with an extra-chromosomal archaeal plasmid, pTI1, of 7.7 kb and predicted 2,425 genes. The DNA G + C content was 54.9 mol%. Based on physiological properties, phylogenetic, and genome analysis, we proposed that strain IOH1T (= KCTC 15844T = JCM 39077T) is assigned to a new species in the genus Thermococcus and named Thermococcus indicus sp. nov.

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Macrobenthic communities in the polymetallic nodule field, Indian Ocean, based on multicore and box core analysis
Santosh Gaikwad, Sabyasachi Sautya, Samir Damare, Maria Brenda Luzia Mascarenhas-Pereira, Vijayshree Gawas, Jayesh Patil, Mandar Nanajkar, Sadiq Bukhari
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Natronorubrum halophilum sp. nov. isolated from two inland salt lakes: Cong-Qi Tao , Yi Ding , Yang-Jie Zhao , Heng-Lin Cui; J. Microbiol. 2020;58(2):105-112. Published online January 29, 2020; DOI: https://doi.org/10.1007/s12275-020-9514-8

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Abstract

Two halophilic archaeal strains, SHR37T and NEN6, were isolated from salt lakes located in the Tibet and Xinjiang regions of China. The two strains were found to form a single cluster (99.9% and 99.3% similarity, respectively) separating them from the six current members of Natronorubrum (94.7– 96.9% and 86.1–90.8% similarity, respectively) on the basis of the 16S rRNA and rpoB􍿁 gene sequence similarities and phylogenetic analysis. Diverse phenotypic characteristics differentiate strains SHR37T and NEN6 from current Natronorubrum members. Their polar lipids are C20C20 and C20C25 glycerol diether derivatives of PG, PGP-Me, and a major glycolipid chromatographically identical to disulfated mannosyl glucosyl diether (S2-DGD). Four minor unidentified glycolipids are also present. The OrthoANI and in silico DDH values of the two strains were 97.3% and 76.1%, respectively, which were much higher than the threshold values proposed as a species boundary (ANI 95–96% and in silico DDH 70%), which revealed that the two strains represent one species; the two values (ANI 79.0–81.9% and in silico DDH 23.5– 25.7%) of the strains examined in this study and the current members of Natronorubrum are much lower than the recommended threshold values, suggesting that strains SHR37T and NEN6 represent a genomically different species of Natronorubrum. These results showed that strains SHR37T (= CGMCC 1.15233T = JCM 30845T) and NEN6 (= CGMCC 1.17161) represent a novel species of Natronorubrum, for which the name Natronorubrum halophilum sp. nov. is proposed.

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Halobacterium yunchengense sp. nov., Natronomonas amylolytica sp. nov., Halorientalis halophila sp. nov., Halobellus salinisoli sp. nov., halophilic archaea isolated from a saline lake and inland saline soil
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Zhang-Ping Wu, Xi-Wen Zheng, Ya-Ping Sun, Bei-Bei Wang, Jing Hou, Heng-Lin Cui
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Xue Ma, Yao Hu, Xin-Xin Li, Shun Tan, Mu Cheng, Jing Hou, Heng-Lin Cui
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Bei-Bei Wang, Chen-Xi Bao, Ya-Ping Sun, Jing Hou, Heng-Lin Cui
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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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Abstract

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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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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Abstract

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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Paenibacillus nuruki sp. nov., isolated from Nuruk, a Korean fermentation starter: Soo-Jin Kim , Hayoung Cho , Jae-Hyung Ahn , Hang-Yeon Weon , Jae-Ho Joa , Jeong-Seon Kim , Soon-Wo Kwon; J. Microbiol. 2019;57(10):836-841. Published online June 27, 2019; DOI: https://doi.org/10.1007/s12275-019-9118-3

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A Gram-stain-positive, rod-shaped, non-endospore-forming, motile by means of peritrichous flagella, facultatively anaerobic bacterium designated TI45-13arT was isolated from Nuruk, a Korean traditional Makgeolli fermentation starter. It grew at 4–35°C (optimum, 28–30°C), pH 5.0–9.0 (optimum, pH 7.0) and NaCl concentrations up to 5% (w/v). Phylogenetic trees generated using 16S rRNA gene sequences revealed that strain TI45-13arT belonged to the genus Paenibacillus and showed the highest sequence similarities with Paenibacillus kyungheensis DCY88T (98.5%), Paenibacillus hordei RH-N24T (98.4%) and Paenibacillus nicotianae YIM h-19T (98.1%). The major fatty acid was anteiso-C15:0. The DNA G+C content was 39.0 mol%, and MK-7 was the predominant isoprenoid quinone. The polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, three unidentified glycolipids, and one unidentified aminoglycolipid. The cell-wall peptidoglycan contained meso-diaminopimelic acid. On the basis of polyphasic taxonomy study, it was suggested that strain TI45-13arT represents a novel species within the genus Paenibacillus for which the name Paenibacillus nuruki sp. nov. is proposed. The type strain was TI45-13arT (= KACC 18728T = NBRC 112013T).

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Yadong Hu, Hongjie Li, Yaoyi Chen, Qiling Zhang, Shigang Zheng, Dan Rao, Ze Chun, Ruoxi Zhao
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Isolation and characterization of a novel piezotolerant bacterium Lysinibacillus yapensis sp. nov., from deep-sea sediment of the Yap Trench, Pacific Ocean: Libo Yu , Xixiang Tang , Shiping Wei , Yinkun Qiu , Xiashutong Xu , Guangxin Xu , Qilin Wang , Qian Yang; J. Microbiol. 2019;57(7):562-568. Published online June 27, 2019; DOI: https://doi.org/10.1007/s12275-019-8709-3

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A Gram-positive, aerobic, rod-shaped, spore-forming bacterium, designated YLB-03T, with peritrichous flagella was isolated from deep-sea sediment of the Yap Trench at a depth of 4435 m. The bacterium was found to be catalase-positive but oxidase-negative. Growth of this bacterium was observed at 15–50°C (optimum 37°C), pH 5–10.5 (optimum 7), 0–5% NaCl (optimum 1%, w/v) and 0.1–50 MPa (optimum 0.1 MPa). Phylogenetic analysis based on 16S rRNA gene sequences showed that strain YLB-03T was a member of the genus Lysinibacillus. Strain YLB-03T was closely related to Lysinibacillus sinduriensis BLB-1T and Lysinibacillus chungkukjangi 2RL3-2T (98.4%), Lysinibacillus halotolerans LAM- 612T (98.0%), Lysinibacillus telephonicus KT735049T (97.5%), Lysinibacillus endophyticus C9T (97.5%), Lysinibacillus composti NCCP-36T and Lysinibacillus massiliensis 4400831T (97.3%). The ANI and the GGDC DNA-DNA hybridization estimate values between strain YLB-03T and closely related type strains were 73.7–76.3% and 34.7–38.7%, respectively. The principal fatty acids were anteiso-C15:0 and iso-C15:0. The G+C content of the chromosomal DNA was 39.6 mol%. The respiratory quinone was determined to be MK-7. The diagnostic amino acids in the cell wall peptidoglycan contained Lys-Asp (type A4α) and the cell-wall sugars were glucose and xylose. The polar lipids included diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, and an unidentified phospholipid. The combined genotypic and phenotypic data showed that strain YLB-03T represents a novel species within the genus Lysinibacillus, for which the name Lysinibacillus yapensis sp. nov. is proposed, with the type strain YLB-03T (= MCCC 1A12698T = JCM 32871T).

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