1kmi
From Proteopedia
CRYSTAL STRUCTURE OF AN E.COLI CHEMOTAXIS PROTEIN, CHEZ
Structural highlights
Function[CHEY_ECOLI] 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. Overexpression of CheY in association with MotA and MotB improves motility of a ycgR disruption, suggesting there is an interaction (direct or indirect) between the c-di-GMP-binding flagellar brake protein and the flagellar stator.[1] [CHEZ_ECOLI] Plays an important role in bacterial chemotaxis signal transduction pathway by accelerating the dephosphorylation of phosphorylated CheY (CheY-P).[2] [3] 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 PubMedThe protein CheZ, which has the last unknown structure in the Escherichia coli chemotaxis pathway, stimulates the dephosphorylation of the response regulator CheY by an unknown mechanism. Here we report the co-crystal structure of CheZ with CheY, Mg(2+) and the phosphoryl analog, BeF(3)(-). The predominant structural feature of the CheZ dimer is a long four-helix bundle composed of two helices from each monomer. The side chain of Gln 147 of CheZ inserts into the CheY active site and is essential to the dephosphorylation activity of CheZ. Gln 147 may orient a water molecule for nucleophilic attack, similar to the role of the conserved Gln residue in the RAS family of GTPases. Similarities between the CheY[bond] CheZ and Spo0F [bond]Spo0B structures suggest a general mode of interaction for modulation of response regulator phosphorylation chemistry. Structure and catalytic mechanism of the E. coli chemotaxis phosphatase CheZ.,Zhao R, Collins EJ, Bourret RB, Silversmith RE Nat Struct Biol. 2002 Aug;9(8):570-5. PMID:12080332[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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