Journal of Microbiology

Journal Article

Lysobacter arenosi sp. nov. and Lysobacter solisilvae sp. nov. isolated from soil: Kyeong Ryeol Kim† , Kyung Hyun Kim† , Shehzad Abid Khan , Hyung Min Kim , Dong Min Han , Che Ok Jeon; J. Microbiol. 2021;59(8):709-718. Published online June 1, 2021; DOI: https://doi.org/10.1007/s12275-021-1156-y

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Two Gram-stain negative, yellow-pigmented, and mesophilic bacteria, designated strains R7T and R19T, were isolated from sandy and forest soil, South Korea, respectively. Both strains were non-motile rods showing catalase- and oxidase-positive activities. Both strains were shown to grow at 10–37°C and pH 6.0–9.0, and in the presence of 0–1.5% (w/v) NaCl. Strain R7T contained iso-C14:0, iso-C15:0, iso-C16:0, and summed feature 9 (comprising C16:0 10-methyl and/or iso-C17:1 ω9c), whereas strain R19T contained iso-C11:0 3-OH, C16:1 ω7c alcohol, iso-C11:0, iso-C15:0, iso-C16:0, and summed feature 9 (comprising C16:0 10-methyl and/or iso-C17:1 ω9c) as major cellular fatty acids (> 5%). Both strains contained ubiquinone- 8 as the sole isoprenoid quinone and phosphatidylglycerol, phosphatidylethanolamine, and an unidentified phospholipid as the major polar lipids. The DNA G + C contents of strains R7T and R19T calculated from their genomes were 66.9 mol% and 68.9 mol%, respectively. Strains R7T and R19T were most closely related to Lysobacter panacisoli C8-1T and Lysobacter niabensis GH34-4T with 98.7% and 97.8% 16S rRNA sequence similarities, respectively. Phylogenetic analyses based on 16S rRNA gene sequences showed that strains R7T and R19T formed distinct phylogenetic lineages within the genus Lysobacter. Based on phenotypic, chemotaxonomic, and molecular features, strains R7T and R19T represent novel species of the genus Lysobacter, for which the names Lysobacter arenosi sp. nov. and Lysobacter solisilvae sp. nov. are proposed. The type strains of L. arenosi and L. solisilvae are R7T (= KACC 21663T = JCM 34257T) and R19T (= KACC 21767T = JCM 34258T), respectively.

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Review

Omics in gut microbiome analysis: Tae Woong Whon , Na-Ri Shin , Joon Yong Kim , Seong Woon Roh; J. Microbiol. 2021;59(3):292-297. Published online February 23, 2021; DOI: https://doi.org/10.1007/s12275-021-1004-0

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Abstract

Our understanding of the interactions between microbial communities and their niche in the host gut has improved owing to recent advances in environmental microbial genomics. Integration of metagenomic and metataxonomic sequencing data with other omics data to study the gut microbiome has become increasingly common, but downstream analysis after data integration and interpretation of complex omics data remain challenging. Here, we review studies that have explored the gut microbiome signature using omics approaches, including metagenomics, metataxonomics, metatranscriptomics, and metabolomics. We further discuss recent analytics programs to analyze and integrate multi-omics datasets and further utilization of omics data with other advanced techniques, such as adaptive immune receptor repertoire sequencing, microbial culturomics, and machine learning, to evaluate important microbiome characteristics in the gut.

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Journal Articles

Impact of feeding regimens on the composition of gut microbiota and metabolite profiles of plasma and feces from Mongolian sheep: Bohui Wang , Yulong Luo , Rina Su , Duo Yao , Yanru Hou , Chang Liu , Rui Du , Ye Jin; J. Microbiol. 2020;58(6):472-482. Published online April 22, 2020; DOI: https://doi.org/10.1007/s12275-020-9501-0

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Abstract

Mongolian sheep are an indigenous ruminant raised for wool and meat production in China. The gut microbial community plays an important role in animal performance and metabolism. The objective of this study was to investigate the effects of two feeding regimens on the diversity and composition of gut microbiota and metabolite profiles of feces and plasma from Mongolian sheep. A total of 20 Mongolian sheep were assigned to one of two feeding regimens: free grazing (FG) and barn confinement (BC). When samples were collected, the average live weights of the sheep were 31.28 ± 1.56 kg and 34.18 ± 1.87 kg for the FG and BC groups, respectively. At the genus level, the FG group showed higher levels of Bacteroides, RC9_gut_group, Alistipes, Phocaeicola, Barnesiella, and Oscillibacter, and lower levels of Succinivibrio, Treponema, and Prevotella, compared to the BC group. The butyric acid content in feces was lower in the FG group (P < 0.05). Higher levels of palmitic acid, oleic acid, alpha-linolenic acid, L-carnitine, L-citrulline, and L-histidine, and lower levels of L-tyrosine, L-phenylalanine, and L-kynurenine were found in the plasma of the FG sheep. Moreover, there were substantial associations between several gut microbiota genera and alterations in feces and plasma metabolites especially those involved in the metabolism of butyric acid, linolenic acid, and L-tyrosine. Feeding regimens can not only influence the composition of gut microbiota, but also alter metabolic homeostasis in sheep.

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Zur-regulated lipoprotein A contributes to the fitness of Acinetobacter baumannii: Eun Kyung Lee , Chul Hee Choi , Man Hwan Oh; J. Microbiol. 2020;58(1):67-77. Published online January 2, 2020; DOI: https://doi.org/10.1007/s12275-020-9531-7

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Abstract

Acinetobacter baumannii is a notorious nosocomial pathogen that commonly infects severely ill patients. Zinc (Zn) is essential to survive and adapt to different environment and host niches in A. baumannii. Of the Zinc uptake regulator (Zur)-regulated genes in A. baumannii, the A1S_3412 gene encoding a Zur-regulated lipoprotein A (ZrlA) is critical for cell envelope integrity and overcoming antibiotic exposure. This study investigated whether ZrlA contributes to the fitness of A. baumannii in vitro and in vivo using the wildtype A. baumannii ATCC 17978, ΔzrlA mutant, and zrlAcomplemented strains. The ΔzrlA mutant showed reduced biofilm formation, surface motility, and adherence to and invasion of epithelial cells compared to the wild-type strain. In a mouse pneumonia model, the ΔzrlA mutant showed significantly lower bacterial numbers in the blood than the wildtype strain. These virulence traits were restored in the zrlAcomplemented strain. Under static conditions, the expression of csuCDE, which are involved in the chaperone-usher pili assembly system, was significantly lower in the ΔzrlA mutant than in the wild-type strain. Moreover, the expression of the bfmR/S genes, which regulate the CsuA/BABCDE system, was significantly lower in the ΔzrlA mutant under static conditions than in the wild-type strain. Our results indicate that the zrlA gene plays a role in the fitness of A. baumannii by regulating the BfmR/S two-component system and subsequently the CsuA/BABCDE chaperone-usher pili assembly system, suggesting it as a potential target for anti-virulence strategies against A. baumannii.

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COG0523 proteins: a functionally diverse family of transition metal-regulated G3E P-loop GTP hydrolases from bacteria to man
Katherine A Edmonds, Matthew R Jordan, David P Giedroc
Metallomics.2021;[Epub] CrossRef
The role of Zur-regulated lipoprotein A in bacterial morphology, antimicrobial susceptibility, and production of outer membrane vesicles in Acinetobacter baumannii
Nayeong Kim, Hyo Jeong Kim, Man Hwan Oh, Se Yeon Kim, Mi Hyun Kim, Joo Hee Son, Seung Il Kim, Minsang Shin, Yoo Chul Lee, Je Chul Lee
BMC Microbiology.2021;[Epub] CrossRef
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Research Support, Non-U.S. Gov'ts

Protein-Protein Interactions between Histidine Kinases and Response Regulators of Mycobacterium tuberculosis H37Rv: Ha-Na Lee , Kwang-Eun Jung , In-Jeong Ko , Hyung Suk Baik , Jeong-Il Oh; J. Microbiol. 2012;50(2):270-277. Published online April 27, 2012; DOI: https://doi.org/10.1007/s12275-012-2050-4

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Abstract: Using yeast two-hybrid assay, we investigated protein-protein interactions between all orthologous histidine kinase (HK)/response regulator (RR) pairs of M. tuberculosis H37Rv and identified potential protein-protein interactions between a noncognate HK/RR pair, DosT/NarL. The protein interaction between DosT and NarL was verified by phosphotransfer reaction from DosT to NarL. Furthermore, we found that the DosT and DosS HKs, which share considerable sequence similarities to each other and form a twocomponent system with the DosR RR, have different crossinteraction capabilities with NarL: DosT interacted with NarL, while DosS did not. The dimerization domains of DosT and DosS were shown to be sufficient to confer specificity for DosR, and the different cross-interaction abilities of DosS and DosT with NarL were demonstrated to be attributable to variations in the amino acid sequences of the α2-helices of their dimerization domains.

Transcriptional Regulation of hemO Encoding Heme Oxygenase in Clostridium perfringens: Sufi Hassan , Kaori Ohtani , Ruoyu Wang , Yonghui Yuan , Yun Wang , Yumi Yamaguchi , Tohru Shimizu; J. Microbiol. 2010;48(1):96-101. Published online March 11, 2010; DOI: https://doi.org/10.1007/s12275-009-0384-3

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Abstract: A Gram-positive anaerobic pathogen, Clostridium perfringens, causes clostridial myonecrosis or gas gangrene in humans by producing numerous extracellular toxins and enzymes that act in concert to degrade host tissues. The ability of infectious bacteria to acquire sufficient iron during infection is essential for the pathogen to cause disease. In the C. perfringens strain 13 genome, a heme oxygenase gene homologue (CPE0214, hemO) was found and its role was examined. The purified recombinant HemO protein showed heme oxygenase activity that can convert heme to biliverdin. hemO transcription was induced in response to extracellular hemin in a dose-dependent manner. The global two-component VirR/VirS regulatory system and its secondary regulator VR-RNA had positive regulatory effects on the transcription of hemO. These data indicate that heme oxygenase may play important roles in iron acquisition and cellular metabolism, and that the VirR/VirS-VR-RNA system is also involved in the regulation of cellular iron homeostasis, which might be important for the survival of C. perfringens in a human host.

Ligand-Receptor Recognition for Activation of Quorum Sensing in Staphylococcus aureus: Li-Chun Chen , Li-Tse Tsou , Feng-Jui Chen; J. Microbiol. 2009;47(5):572-581. Published online October 24, 2009; DOI: https://doi.org/10.1007/s12275-009-0004-2

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Abstract: The accessory gene regulator (agr) locus controls many of the virulence toxins involved in Staphylococcus aureus pathogenesis, and can be divided into four specificity groups. AgrC is the only group-specific receptor to mediate both intra-group activation and inter-group inhibition. We studied the ligand-receptor recognition of the agr system in depth by using a luciferase reporter system to identify the key residues responsible for AgrC activation in two closely related agr groups, AgrC-I, and AgrC-IV. Fusion PCR and site-directed mutagenesis were used to screen for functional residues of AgrC. Our data suggest that for AgrC-IV activation, residue 101 is critical for activating the receptor. In contrast, the key residues for the activation of AgrC-I are located at residues 49~59, 107, and 116. However, three residue changes, T101A, V107S, I116S, are sufficient to convert the AIP recognizing specificity from AgrC-IV to AgrC-I.

Cyanobacterial Hybrid Kinase Sll0043 Regulates Phototaxis by Suppressing Pilin and Twitching Motility Protein: Bong-Jeong Shin , Jeehyun Oh , Sungsoo Kang , Young-Ho Chung , Young Mok Park , Young Hwan Kim , Seungil Kim , Jong Bhak , Jong-Soon Choi; J. Microbiol. 2008;46(3):300-308. Published online July 5, 2008; DOI: https://doi.org/10.1007/s12275-007-0212-6

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Abstract: The unicellular cyanobacterium Synechocystis sp. PCC 6803 glides toward a light source through the interplay of positive phototaxis genes and proteins. In genetic analysis, the complete disruption of the hybrid sensory kinase sll0043 produced negative phototaxis. Furthermore, Sll0043 was found to be a hub protein by in silico prediction of protein-protein interaction, in which Sll0043 was predominantly linked to seven two-component proteins with high confidence. To understand the regulation and networking of positive phototaxis proteins, the proteomic profile of the sll0043 mutant was compared to that of wild-type. In the sll0043 mutant, 18 spots corresponding to 15 unique proteins were altered by 1.3 to 59 fold; the spots were identified by 2-DE/MALDI-MS analysis. Down-regulated proteins in the sll0043 null-mutant included chaperonins, superoxide dismutase, and phycocyanin β-subunit. In contrast, nine proteins involved in photosynthesis, translation, regulatory function, and other functions were up-regulated. In particular, a twitching motility protein (PilT1) was induced over 2-fold in sll0043 mutant. Moreover, semiquantitative and quantitative RT-PCR analysis revealed that pilin (pilA1), pili motor (pilT1), and pili switch gene (pilT2) were significantly increased in sll0043 mutant. These results suggest that the hybrid kinase Sll0043 regulates positive phototaxis by suppressing the expression of pili biosynthesis and regulatory genes and through the interplay with positive phototaxis/motility two-component proteins.

Effect of Mutations of Five Conserved Histidine Residues in the Catalytic Subunit of the cbb3 Cytochrome c Oxidase on its Function: Jeong-Il Oh; J. Microbiol. 2006;44(3):284-292.; DOI: https://doi.org/2384 [pii]

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Abstract: The cbb3 cytochrome c oxidase has the dual function as a terminal oxidase and oxygen sensor in the photosynthetic bacterium, Rhodobacter sphaeroides. The cbb3 oxidase forms a signal transduction pathway together with the PrrBA two-component system that controls photosynthesis gene expression in response to changes in oxygen tension in the environment. Under aerobic conditions the cbb3 oxidase generates an inhibitory signal, which shifts the equilibrium of PrrB kinase/phosphatase activities towards the phosphatase mode. Photosynthesis genes are thereby turned off under aerobic conditions. The catalytic subunit (CcoN) of the R. sphaeroides cbb3 oxidase contains five histidine residues (H214, H233, H303, H320, and H444) that are conserved in all CcoN subunits of the cbb3 oxidase, but not in the catalytic subunits of other members of copper-heme superfamily oxidases. H214A mutation of CcoN affected neither catalytic activity nor sensory (signaling) function of the cbb3 oxidase, whereas H320A mutation led to almost complete loss of both catalytic activity and sensory function of the cbb3 oxidase. H233V and H444A mutations brought about the partial loss of catalytic activity and sensory function of the cbb3 oxidase. Interestingly, the H303A mutant form of the cbb3 oxidase retains the catalytic function as a cytochrome c oxidase as compared to the wild-type oxidase, while it is defective in signaling function as an oxygen sensor. H303 appears to be implicated in either signal sensing or generation of the inhibitory signal to the PrrBA two-component system.

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