1I5D image
Deposition Date 2001-02-26
Release Date 2001-08-26
Last Version Date 2023-08-09
Entry Detail
PDB ID:
1I5D
Title:
STRUCTURE OF CHEA DOMAIN P4 IN COMPLEX WITH TNP-ATP
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
2.90 Å
R-Value Free:
0.31
R-Value Work:
0.26
R-Value Observed:
0.26
Space Group:
P 43 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:CHEMOTAXIS PROTEIN CHEA
Gene (Uniprot):cheA
Chain IDs:A
Chain Length:191
Number of Molecules:1
Biological Source:Thermotoga maritima
Primary Citation
Nucleotide binding by the histidine kinase CheA.
Nat.Struct.Biol. 8 353 360 (2001)
PMID: 11276258 DOI: 10.1038/86243

Abstact

To probe the structural basis for protein histidine kinase (PHK) catalytic activity and the prospects for PHK-specific inhibitor design, we report the crystal structures for the nucleotide binding domain of Thermotoga maritima CheA with ADP and three ATP analogs (ADPNP, ADPCP and TNP-ATP) bound with either Mg(2+) or Mn(2+). The conformation of ADPNP bound to CheA and related ATPases differs from that reported in the ADPNP complex of PHK EnvZ. Interactions of the active site with the nucleotide gamma-phosphate and its associated Mg(2+) ion are linked to conformational changes in an ATP-lid that could mediate recognition of the substrate domain. The inhibitor TNP-ATP binds CheA with its phosphates in a nonproductive conformation and its adenine and trinitrophenyl groups in two adjacent binding pockets. The trinitrophenyl interaction may be exploited for designing CheA-targeted drugs that would not interfere with host ATPases.

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