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• W2794664840 abstract "Shigella rely entirely on the action of a single type three secretion system (T3SS) to support cellular invasion of colonic epithelial cells and to circumvent host immune responses. The ATPase Spa47 resides at the base of the Shigella needle-like type three secretion apparatus (T3SA), supporting protein secretion through the apparatus and providing a likely means for native virulence regulation by Shigella and a much needed target for non-antibiotic therapeutics to treat Shigella infections. Here, we show that MxiN is a differential regulator of Spa47 and that its regulatory impact is determined by the oligomeric state of the Spa47 ATPase, with which it interacts. In vitro and in vivo characterization shows that interaction of MxiN with Spa47 requires the six N-terminal residues of Spa47 that are also necessary for stable Spa47 oligomer formation and activation. This interaction with MxiN negatively influences the activity of Spa47 oligomers while upregulating the ATPase activity of monomeric Spa47. Detailed kinetic analyses of monomeric and oligomeric Spa47 in the presence and absence of MxiN uncover additional mechanistic insights into the regulation of Spa47 by MxiN, suggesting that the MxiN/Spa47 species resulting from interaction with monomeric and oligomeric Spa47 are functionally distinct and that both could be involved in Shigella T3SS regulation. Uncovering regulation of Spa47 by MxiN addresses an important gap in the current understanding of how Shigella controls T3SA activity and provides the first description of differential T3SS ATPase regulation by a native T3SS protein." @default.
• W2794664840 created "2018-04-06" @default.
• W2794664840 creator A5056906439 @default.
• W2794664840 creator A5079721014 @default.
• W2794664840 date "2018-03-29" @default.
• W2794664840 modified "2023-10-16" @default.
• W2794664840 title "MxiN Differentially Regulates Monomeric and Oligomeric Species of the <i>Shigella</i> Type Three Secretion System ATPase Spa47" @default.
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• W2794664840 doi "https://doi.org/10.1021/acs.biochem.8b00070" @default.
• W2794664840 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5910026" @default.
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