2chy | pdb_00002chy
THREE-DIMENSIONAL STRUCTURE OF CHEY, THE RESPONSE REGULATOR OF BACTERIAL CHEMOTAXIS
Structural highlights
Function[CHEY_SALTY] Involved in the transmission of sensory signals from the chemoreceptors to the flagellar motors. In its active (phosphorylated or acetylated) form, CheY exhibits enhanced binding to a switch component, FliM, at the flagellar motor which induces a change from counterclockwise to clockwise flagellar rotation. Shows autophosphatase activity which is enhanced by CheZ. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedHomologies among bacterial signal transduction proteins suggest that a common mechanism mediates processes such as chemotaxis, osmoregulation, sporulation, virulence, and responses to nitrogen, phosphorous and oxygen deprivation. A common kinase-mediated phosphotransfer reaction has recently been identified in chemotaxis, nitrogen regulation, and osmoregulation. In chemotaxis, the CheA kinase passes a phosphoryl group to the cytoplasmic protein CheY, which functions as a phosphorylation-activated switch that interacts with flagellar components to regulate motility. We report here the X-ray crystal structure of the Salmonella typhimurium CheY protein. The determination of the structure was facilitated by the use of site-specific mutagenesis to engineer heavy-atom binding sites. CheY is a single-domain protein composed of a doubly wound five-stranded parallel beta-sheet. The phosphoacceptor site in CheY is probably a cluster of aspartic-acid side chains near the C-terminal edge of the beta-sheet. The pattern of sequence similarity of CheY with components of other regulatory systems can be interpreted in the light of the CheY structure and supports the view that this family of proteins have a common structural motif and active site. Three-dimensional structure of CheY, the response regulator of bacterial chemotaxis.,Stock AM, Mottonen JM, Stock JB, Schutt CE Nature. 1989 Feb 23;337(6209):745-9. PMID:2645526[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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