PMID: 11276258 , Related PDB ids: 1I58, 1I59, 1I5A, 1I5B, 1I5C, 1I5D

Authors:

Bilwes AM, Quezada CM, Croal LR, Crane BR, Simon MI

Title:

Nucleotide binding by the histidine kinase CheA.

Journal:

Nat Struct Biol. 2001 Apr;8(4):353-60.

Abstract:

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.