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| {{STRUCTURE_1ffw| PDB=1ffw | SCENE= }} | | {{STRUCTURE_1ffw| PDB=1ffw | SCENE= }} |
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| '''CHEY-BINDING DOMAIN OF CHEA IN COMPLEX WITH CHEY WITH A BOUND IMIDO DIPHOSPHATE'''
| | ===CHEY-BINDING DOMAIN OF CHEA IN COMPLEX WITH CHEY WITH A BOUND IMIDO DIPHOSPHATE=== |
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| ==Overview==
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| New crystallographic structures of the response regulator CheY in association with CheA(124--257), its binding domain in the kinase CheA, have been determined. In all crystal forms, the molecular interactions at the heterodimer interface are identical. Soaking experiments have been performed on the crystals using acetyl phosphate as phosphodonor to CheY. No phosphoryl group attached to Asp57 of CheY is visible from the electron density, but the response regulator in the CheY-CheA(124--257) complex may have undergone a phosphorylation-dephosphorylation process. The distribution of water molecules and the geometry of the active site have changed and are now similar to those of isolated CheY. In a second soaking experiment, imido-diphosphate, an inhibitor of the phosphorylation reaction, was used. This compound binds in the vicinity of the active site, close to the N-terminal part of the first alpha-helix. Together, these results suggest that the binding of CheY to CheA(124--257) generates a geometry of the active site that favours phosphorylation and that imido-diphosphate interferes with phosphorylation by precluding structural changes in this region.
| | The line below this paragraph, {{ABSTRACT_PUBMED_11134926}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 11134926 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_11134926}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Samama, J-P.]] | | [[Category: Samama, J-P.]] |
| [[Category: Welch, M.]] | | [[Category: Welch, M.]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 16:16:35 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 03:11:05 2008'' |