Journal of Microbiology

Review

Overview of bioinformatic methods for analysis of antibiotic resistome from genome and metagenome data: Kihyun Lee , Dae-Wi Kim , Chang-Jun Cha; J. Microbiol. 2021;59(3):270-280. Published online February 23, 2021; DOI: https://doi.org/10.1007/s12275-021-0652-4

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Whole genome and metagenome sequencing are powerful approaches that enable comprehensive cataloging and profiling of antibiotic resistance genes at scales ranging from a single clinical isolate to ecosystems. Recent studies deal with genomic and metagenomic data sets at larger scales; therefore, designing computational workflows that provide high efficiency and accuracy is becoming more important. In this review, we summarize the computational workflows used in the research field of antibiotic resistome based on genome or metagenome sequencing. We introduce workflows, software tools, and data resources that have been successfully employed in this rapidly developing field. The workflow described in this review can be used to list the known antibiotic resistance genes from genomes and metagenomes, quantitatively profile them, and investigate the epidemiological and evolutionary contexts behind their emergence and transmission. We also discuss how novel antibiotic resistance genes can be discovered and how the association between the resistome and mobilome can be explored.

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

Role of the extracytoplasmic function sigma factor CarQ in oxidative response of Bradyrhizobium japonicum: Anchana Thaweethawakorn , Dylan Parks , Jae-Seong So , Woo-Suk Chang; J. Microbiol. 2015;53(8):526-534. Published online July 31, 2015; DOI: https://doi.org/10.1007/s12275-015-5308-9

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Abstract

As a nitrogen-fixing bacterium, Bradyrhizobium japonicum can establish a symbiotic relationship with the soybean plant (Glycine max). To be a successful symbiont, B. japonicum must deal with plant defense responses, such as an oxidative burst. Our previous functional genomics study showed that carQ (bll1028) encoding extracytoplasmic function (ECF) sigma factor was highly expressed (107.8-fold induction) under oxidative stress. Little is known about the underlying mechanisms of how CarQ responds to oxidative stress. In this study, a carQ knock-out mutant was constructed using site-specific mutagenesis to identify the role of carQ in the oxidative response of B. japonicum. The carQ mutant showed a longer generation time than the wild type and exhibited significantly decreased survival at 10 mM H2O2 for 10 min of exposure. Surprisingly, there was no significant difference in expression of oxidative stress-responsive genes such as katG and sod between the wild type and carQ mutant. The mutant also showed a significant increase in susceptibility to H2O2 compared to the wild type in the zone inhibition assay. Nodulation phenotypes of the carQ mutant were distinguishable compared to those of the wild type, including lower numbers of nodules, decreased nodule dry weight, decreased plant dry weight, and a lower nitrogen fixation capability. Moreover, desiccation of mutant cells also resulted in significantly lower percent of survival in both early (after 4 h) and late (after 24 h) desiccation periods. Taken together, this information will provide an insight into the role of the ECF sigma factor in B. japonicum to deal with a plant-derived oxidative burst.

Citations

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Implication of the σ E Regulon Members OmpO and σ N in the Δ ompA 299–356 -Mediated Decrease of Oxidative Stress Tolerance in St
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Microbiology Spectrum.2023;[Epub] CrossRef
Identification and Validation of Reference Genes for Expression Analysis in Nitrogen-Fixing Bacteria under Environmental Stress
Dylan Parks, Christian Peterson, Woo-Suk Chang
Life.2022; 12(9): 1379. CrossRef
MostSinorhizobium melilotiExtracytoplasmic Function Sigma Factors Control Accessory Functions
Claus Lang, Melanie J. Barnett, Robert F. Fisher, Lucinda S. Smith, Michelle E. Diodati, Sharon R. Long, Craig D. Ellermeier, Claude Bruand, Sarah Ades, Hans-Martin Fischer
mSphere.2018;[Epub] CrossRef

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