2f9z
From Proteopedia
Complex between the chemotaxis deamidase CheD and the chemotaxis phosphatase CheC from Thermotoga maritima
Structural highlights
FunctionCHEC_THEMA Involved in restoring normal CheY-P levels by dephosphorylating CheY-P. Inhibits CheD by incorporating in its fold a structural motif that mimics a CheD substrate recognition site to bait and inactivate it. 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 PubMedSignal transduction underlying bacterial chemotaxis involves excitatory phosphorylation and feedback control through deamidation and methylation of sensory receptors. The structure of a complex between the signal-terminating phosphatase, CheC, and the receptor-modifying deamidase, CheD, reveals how CheC mimics receptor substrates to inhibit CheD and how CheD stimulates CheC phosphatase activity. CheD resembles other cysteine deamidases from bacterial pathogens that inactivate host Rho-GTPases. CheD not only deamidates receptor glutamine residues contained within a conserved structural motif but also hydrolyzes glutamyl-methyl-esters at select regulatory positions. Substituting Gln into the receptor motif of CheC turns the inhibitor into a CheD substrate. Phospho-CheY, the intracellular signal and CheC target, stabilizes the CheC:CheD complex and reduces availability of CheD. A point mutation that dissociates CheC from CheD impairs chemotaxis in vivo. Thus, CheC incorporates an element of an upstream receptor to influence both its own effect on receptor output and that of its binding partner, CheD. A receptor-modifying deamidase in complex with a signaling phosphatase reveals reciprocal regulation.,Chao X, Muff TJ, Park SY, Zhang S, Pollard AM, Ordal GW, Bilwes AM, Crane BR Cell. 2006 Feb 10;124(3):561-71. PMID:16469702[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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