1FFS image
Deposition Date 2000-07-26
Release Date 2001-01-17
Last Version Date 2024-02-07
Entry Detail
PDB ID:
1FFS
Title:
CHEY-BINDING DOMAIN OF CHEA IN COMPLEX WITH CHEY FROM CRYSTALS SOAKED IN ACETYL PHOSPHATE
Biological Source:
Source Organism:
Escherichia coli (Taxon ID: 562)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.40 Å
R-Value Free:
0.25
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:CHEMOTAXIS PROTEIN CHEY
Chain IDs:A, C
Chain Length:128
Number of Molecules:2
Biological Source:Escherichia coli
Polymer Type:polypeptide(L)
Molecule:CHEMOTAXIS PROTEIN CHEA
Gene (Uniprot):cheA
Chain IDs:B, D
Chain Length:134
Number of Molecules:2
Biological Source:Escherichia coli
Ligand Molecules
Primary Citation
Further insights into the mechanism of function of the response regulator CheY from crystallographic studies of the CheY--CheA(124--257) complex.
Acta Crystallogr.,Sect.D 57 44 51 (2001)
PMID: 11134926 DOI: 10.1107/S090744490001492X

Abstact

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.

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Primary Citation of related structures