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• W2164691736 abstract "Among pathogenic strains of Listeria monocytogenes , the σ B transcription factor has a pivotal role in the outcome of food-borne infections. This factor is activated by diverse stresses to provide general protection against multiple challenges, including those encountered during gastrointestinal passage. It also acts with the PrfA regulator to control virulence genes needed for entry into intestinal lumen cells. Environmental and nutritional signals modulate σ B activity via a network that operates by the partner switching mechanism, in which protein interactions are controlled by serine phosphorylation. This network is well characterized in the related bacterium Bacillus subtilis . A key difference in Listeria is the presence of only one input phosphatase, RsbU, instead of the two found in B. subtilis . Here, we aim to determine whether this sole phosphatase is required to convey physical, antibiotic and nutritional stress signals, or if additional pathways might exist. To that end, we constructed L. monocytogenes 10403S strains bearing single-copy, σ B -dependent opuCA – lacZ reporter fusions to determine the effects of an rsbU deletion under physiological conditions. All stresses tested, including acid, antibiotic, cold, ethanol, heat, osmotic and nutritional challenge, required RsbU to activate σ B . This was of particular significance for cold stress activation, which occurs via a phosphatase-independent mechanism in B. subtilis . We also assayed the effects of the D80N substitution in the upstream RsbT regulator that activates RsbU. The mutant had a phenotype consistent with low and uninducible phosphatase activity, but nonetheless responded to nutritional stress. We infer that RsbU activity but not its induction is required for nutritional signalling, which would enter the network downstream from RsbU." @default.
• W2164691736 created "2016-06-24" @default.
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• W2164691736 date "2010-09-01" @default.
• W2164691736 modified "2023-09-25" @default.
• W2164691736 title "Physical and antibiotic stresses require activation of the RsbU phosphatase to induce the general stress response in Listeria monocytogenes" @default.
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• W2164691736 doi "https://doi.org/10.1099/mic.0.041202-0" @default.
• W2164691736 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3068687" @default.
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• W2164691736 hasPublicationYear "2010" @default.
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