Journal of Microbiology

Journal Articles

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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Jejubacter calystegiae gen. nov., sp. nov., moderately halophilic, a new member of the family Enterobacteriaceae, isolated from beach morning glory
Lingmin Jiang, Dexin Wang, Jung-Sook Lee, Dae-Hyuk Kim, Jae Cheol Jeong, Cha Young Kim, Suk Weon Kim, Jiyoung Lee
Journal of Microbiology.2020; 58(5): 357. CrossRef

Comparative Study of the marR Genes within the Family Enterobacteriaceae: Dan Wang , Changjiang Guo , Longjiang Gu , Xiaohui Zhang; J. Microbiol. 2014;52(6):452-459. Published online April 11, 2014; DOI: https://doi.org/10.1007/s12275-014-3586-2

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Abstract

marR genes are members of an ancient family originally identified in Escherichia coli. This family is widely distributed in archaea and bacteria. Homologues of this family have a conserved winged helix fold. MarR proteins are involved in non-specific resistance systems conferring resistance to multiple antibiotics. Extensive studies have shown the importance of MarR proteins in physiology and pathogenicity in Enterobacteria, but little is known about their origin or evolution. In this study, all the marR genes in 43 enterobacterial genomes representing 14 genera were identified, and the phylogenetic relationships and genetic parameters were analyzed. Several major findings were made. Three conserved marR genes originated earlier than Enterobacteriaceae and a geneloss event was found to have taken place in Yersinia pestis Antiqua. Three functional genes, rovA, hor, and slyA, were found to be clear orthologs among Enterobacteriaceae. The copy number of marR genes in Enterobacteriaceae was found to vary from 2 to 11. These marR genes exhibited a faster rate of nucleotide substitution than housekeeping genes did. Specifically, the regions of marR domain were found to be subject to strong purifying selection. The phylogenetic relationship and genetic parameter analyses were consistent with conservation and specificity of marR genes. These dual characters helped MarR to maintain a conserved binding motif and variable C-terminus, which are important to adaptive responses to a number of external stimuli in Enterobacteriaceae.

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Biology of MarR family transcription factors and implications for targets of antibiotics against tuberculosis
Zhen Gong, Hui Li, Yuhua Cai, Andrea Stojkoska, Jianping Xie
Journal of Cellular Physiology.2019; 234(11): 19237. CrossRef
Identification of Two Regulators of Virulence That Are Conserved in Klebsiella pneumoniae Classical and Hypervirulent Strains
Michelle Palacios, Taryn A. Miner, Daniel R. Frederick, Victoria E. Sepulveda, Joshua D. Quinn, Kimberly A. Walker, Virginia L. Miller, Joanna B. Goldberg
mBio.2018;[Epub] CrossRef
Control of virulence gene transcription by indirect readout in Vibrio cholerae and Salmonella enterica serovar Typhimurium
Charles J. Dorman, Matthew J. Dorman
Environmental Microbiology.2017; 19(10): 3834. CrossRef
Eha, a regulator ofEdwardsiella tarda, required for resistance to oxidative stress in macrophages
Daqing Gao, Yuhong Li, Enjin Zheng, Nian Liu, Zeye Shao, Chengping Lu, Craig Shoemaker
FEMS Microbiology Letters.2016; 363(20): fnw192. CrossRef
Transcriptional regulation of the iac locus from Acinetobacter baumannii by the phytohormone indole-3-acetic acid
Hung-Yu Shu, Ling-Chun Lin, Tze-Kang Lin, Hao-Ping Chen, Hsueh-Hui Yang, Kou-Cheng Peng, Guang-Huey Lin
Antonie van Leeuwenhoek.2015; 107(5): 1237. CrossRef

Research Support, Non-U.S. Gov't

Characterization of Conjugative Plasmids Carrying Antibiotic Resistance Genes Encoding 16S rRNA Methylase, Extended-Spectrum Beta-Lactamase, and/or Plasmid-Mediated AmpC Beta-Lactamase: Hee Young Kang , Jungmin Kim , Sung Yong Seol , Yoo Chul Lee , Je Chul Lee , Dong Taek Cho; J. Microbiol. 2009;47(1):68-75. Published online February 20, 2009; DOI: https://doi.org/10.1007/s12275-008-0158-3

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Abstract: In this study, we identified extended-spectrum ß-lactamase (ESBL) and plasmid-mediated AmpC ß-lactamase which were associated with 16S rRNA methylase gene on the conjugative plasmid. Among 82 clinical isolates of Enterobacteriaceae that carry 16S rRNA methylase gene (64 strains, armA, and 18 strains, rmtB), blaSHV-12 was detected either alone or combined with blaDHA-1, blaCTX-M-3, and blaCTX-M-14 in 30 strains carrying armA and 6 strains carrying rmtB. The blaCTX-M-3 was detected in 13 of 64 strains carrying armA but no strains carrying rmtB. Whereas blaCTX-M-14 was detected in 15 of 18 strains carrying rmtB but only 2 of 64 strains carrying armA. Overall, blaSHV-12 and blaCTX-M-14 was the most common ESBL gene which was associated with armA and rmtB, respectively. In addition, we found that blaCTX-M-3 localized with armA on the same IncL/M plasmid and blaCTX-M-14 localized with rmtB on the same IncA/C plasmid. Restriction fragment length polymorphism of conjugative plasmids and pulsed-field gel electrophoresis of genomic DNAs revealed that intercellular horizontal transfer of conjugative plasmid and clonal transmission have been occurred at the same time.

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