Type III secretion regulatory protein ExsE

UniProtKB accession:  Q9I322

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UniProtKB description:  Acts as a negative regulator of the type III secretion regulon (T3SS) expression (PubMed:15911752). In the absence of inducing signals such as low Ca(2+) or host cell contact, the T3SS/injectisome is expressed at a low basal level and exists in a quiescent state due to ExsA sequestration by ExsD. ExsE binding to ExsC disrupts the complex between ExsC and ExsD, thereby allowing free ExsD to bind ExsA (PubMed:15911752, PubMed:15985546). Upon inducing signal, ExsE is secreted allowing ExsC to bind ExsD. In turn, ExsD cannot bind ExsA and prevent ExsA-mediated transcriptional activation of the type III secretion system (PubMed:15911752, PubMed:15985546).