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The General Stress Response σS Is Regulated by a Partner Switch in the Gram-negative Bacterium Shewanella oneidensis

Abstract : Here, we show that a partner-switching system of the aquatic Proteobacterium Shewanella oneidensis regulates post-translationally σS (also called RpoS), the general stress response sigma factor. Genes SO2118 and SO2119 encode CrsA and CrsR, respectively. CrsR is a three-domain protein comprising a receiver, a phosphatase, and a kinase/anti-sigma domains, and CrsA is an anti-sigma antagonist. In vitro, CrsR sequesters σS and possesses kinase and phosphatase activities toward CrsA. In turn, dephosphorylated CrsA binds the anti-sigma domain of CrsR to allow the release of σS. This study reveals a novel pathway that post-translationally regulates the general stress response sigma factor differently than what was described for other proteobacteria like Escherichia coli. We argue that this pathway allows probably a rapid bacterial adaptation.
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https://hal-amu.archives-ouvertes.fr/hal-01415795
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Submitted on : Tuesday, December 13, 2016 - 3:49:07 PM
Last modification on : Wednesday, November 3, 2021 - 9:37:40 AM

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Sophie Bouillet, Olivier Genest, Cecile Jourlin-Castelli, Michel Fons, Vincent Méjean, et al.. The General Stress Response σS Is Regulated by a Partner Switch in the Gram-negative Bacterium Shewanella oneidensis. Journal of Biological Chemistry, American Society for Biochemistry and Molecular Biology, 2016, pp 26151-26163. ⟨10.1074/jbc.M116.751933⟩. ⟨hal-01415795⟩

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