Mechanism of phosphate transfer by nucleoside diphosphate kinase: X-ray structures of the phosphohistidine intermediate of the enzymes from Drosophila and Dictyostelium.Morera, S., Chiadmi, M., LeBras, G., Lascu, I., Janin, J.
(1995) Biochemistry 34: 11062-11070
- PubMed: 7669763
- Primary Citation of Related Structures:
- PubMed Abstract:
- X-Ray Structure of Nucleoside Diphosphate Kinase
Dumas, C.,Lascu, I.,Morera, S.,Glaser, P.,Fourme, R.,Wallet, V.,Lacombe, M.L.,Veron, M.,Janin, J.
(1992) Embo J. 11: 3203
- Crystal Structure of the Awd Nucleoside Diphosphate Kinase from Drosophila
Chiadmi, M.,Morera, S.,Lascu, I.,Dumas, C.,Lebras, G.,Veron, M.,Janin, J.
(1993) Structure 1: 283
Nucleoside diphosphate kinase (NDP kinase) has a ping-pong mechanism with a phosphohistidine intermediate. Crystals of the enzymes from Dictyostelium discoideum and from Drosophila melanogaster were treated with phosphoramidate, and their X-ray struc ...
Nucleoside diphosphate kinase (NDP kinase) has a ping-pong mechanism with a phosphohistidine intermediate. Crystals of the enzymes from Dictyostelium discoideum and from Drosophila melanogaster were treated with phosphoramidate, and their X-ray structures were determined at 2.1 and 2.2 A resolution, respectively. The atomic models, refined to R factors below 20%, show no conformation change relative to the free proteins. In both enzymes, the active site histidine was phosphorylated on N delta, and it was the only site of phosphorylation. The phosphate group interacts with the hydroxyl group of Tyr56 and with protein-bound water molecules. Its environment is compared with that of phosphohistidines in succinyl-CoA synthetase and in phosphocarrier proteins. The X-ray structures of phosphorylated NDP kinase and of previously determined complexes with nucleoside diphosphates provide a basis for modeling the Michaelis complex with a nucleoside triphosphate, that of the phosphorylated protein with a nucleoside diphosphate, and the transition state of the phosphate transfer reaction in which the gamma-phosphate is pentacoordinated.
Laboratoire de Biologie Structurale, UMR 9920 CNRS-Université Paris-Sud, Gif-sur-Yvette, France.