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- W2169889511 abstract "ABSTRACT The alternative sigma factor σ B contributes to transcription of stress response and virulence genes in diverse gram-positive bacterial species. The composition and functions of the Listeria monocytogenes and Listeria innocua σ B regulons were hypothesized to differ due to virulence differences between these closely related species. Transcript levels in stationary-phase cells and in cells exposed to salt stress were characterized by microarray analyses for both species. In L. monocytogenes , 168 genes were positively regulated by σ B ; 145 of these genes were preceded by a putative σ B consensus promoter. In L. innocua , 64 genes were positively regulated by σ B . σ B contributed to acid stress survival in log-phase cells for both species but to survival in stationary-phase cells only for L. monocytogenes . In summary, (i) the L. monocytogenes σ B regulon includes >140 genes that are both directly and positively regulated by σ B , including genes encoding proteins with importance in stress response, virulence, transcriptional regulation, carbohydrate metabolism, and transport; (ii) a number of L. monocytogenes genes encoding flagellar proteins show higher transcript levels in the Δ sigB mutant, and both L. monocytogenes and L. innocua Δ sigB null mutants have increased motility compared to the respective isogenic parent strains, suggesting that σ B affects motility and chemotaxis; and (iii) although L. monocytogenes and L. innocua differ in σ B -dependent acid stress resistance and have species-specific σ B -dependent genes, the L. monocytogenes and L. innocua σ B regulons show considerable conservation, with a common set of at least 49 genes that are σ B dependent in both species." @default.
- W2169889511 created "2016-06-24" @default.
- W2169889511 creator A5008298660 @default.
- W2169889511 creator A5033699998 @default.
- W2169889511 creator A5082217142 @default.
- W2169889511 date "2008-01-01" @default.
- W2169889511 modified "2023-09-25" @default.
- W2169889511 title "Comparative Analysis of the σ <sup>B</sup> -Dependent Stress Responses in <i>Listeria monocytogenes</i> and <i>Listeria innocua</i> Strains Exposed to Selected Stress Conditions" @default.
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- W2169889511 doi "https://doi.org/10.1128/aem.00951-07" @default.
- W2169889511 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2223194" @default.
- W2169889511 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18024685" @default.
- W2169889511 hasPublicationYear "2008" @default.
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