Anti-sigma-W factor RsiW

UniProtKB accession:  Q45588

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UniProtKB description:  The anti-sigma factor for extracytoplasmic function (ECF) sigma factor sigma-W (SigW). Holds SigW, its cognate ECF sigma factor, in an inactive form until released by regulated intramembrane proteolysis (RIP). SigW and RsiW mediate cell response to cell wall stress (PubMed:12207695). RIP occurs when an extracytoplasmic signal triggers a concerted proteolytic cascade to transmit information and elicit cellular responses. The membrane-spanning regulatory substrate protein is first cut periplasmically (site-1 protease, S1P, PrsW) (PubMed:16816000, PubMed:17020587), then within the membrane itself (site-2 protease, S2P, RasP) (PubMed:15130127), while cytoplasmic proteases finish degrading the anti-sigma factor, liberating sigma-W (PubMed:16899079).