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| {{STRUCTURE_2fka| PDB=2fka | SCENE= }} | | {{STRUCTURE_2fka| PDB=2fka | SCENE= }} |
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| '''Crystal structure of Mg(2+) and BeF(3)(-)-bound CheY in complex with CheZ(200-214) solved from a F432 crystal grown in CAPS (pH 10.5)'''
| | ===Crystal structure of Mg(2+) and BeF(3)(-)-bound CheY in complex with CheZ(200-214) solved from a F432 crystal grown in CAPS (pH 10.5)=== |
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| ==Overview==
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| Chemotaxis, the environment-specific swimming behavior of a bacterial cell is controlled by flagellar rotation. The steady-state level of the phosphorylated or activated form of the response regulator CheY dictates the direction of flagellar rotation. CheY phosphorylation is regulated by a fine equilibrium of three phosphotransfer activities: phosphorylation by the kinase CheA, its auto-dephosphorylation and dephosphorylation by its phosphatase CheZ. Efficient dephosphorylation of CheY by CheZ requires two spatially distinct protein-protein contacts: tethering of the two proteins to each other and formation of an active site for dephosphorylation. The former involves interaction of phosphorylated CheY with the small highly conserved C-terminal helix of CheZ (CheZ(C)), an indispensable structural component of the functional CheZ protein. To understand how the CheZ(C) helix, representing less than 10% of the full-length protein, ascertains molecular specificity of binding to CheY, we have determined crystal structures of CheY in complex with a synthetic peptide corresponding to 15 C-terminal residues of CheZ (CheZ(200-214)) at resolutions ranging from 2.0 A to 2.3A. These structures provide a detailed view of the CheZ(C) peptide interaction both in the presence and absence of the phosphoryl analog, BeF3-. Our studies reveal that two different modes of binding the CheZ(200-214) peptide are dictated by the conformational state of CheY in the complex. Our structures suggest that the CheZ(C) helix binds to a "meta-active" conformation of inactive CheY and it does so in an orientation that is distinct from the one in which it binds activated CheY. Our dual binding mode hypothesis provides implications for reverse information flow in CheY and extends previous observations on inherent resilience in CheY-like signaling domains.
| | The line below this paragraph, {{ABSTRACT_PUBMED_16674976}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 16674976 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_16674976}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Chemotaxis]] | | [[Category: Chemotaxis]] |
| [[Category: Chey-chez peptide complex]] | | [[Category: Chey-chez peptide complex]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 03:59:41 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 15:52:57 2008'' |