1nsp: Difference between revisions

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[[Image:1nsp.gif|left|200px]]
{{Seed}}
[[Image:1nsp.png|left|200px]]


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{{STRUCTURE_1nsp|  PDB=1nsp  |  SCENE=  }}  
{{STRUCTURE_1nsp|  PDB=1nsp  |  SCENE=  }}  


'''MECHANISM OF PHOSPHATE TRANSFER BY NUCLEOSIDE DIPHOSPHATE KINASE: X-RAY STRUCTURES OF A PHOSPHO-HISTIDINE INTERMEDIATE OF THE ENZYMES FROM DROSOPHILA AND DICTYOSTELIUM'''
===MECHANISM OF PHOSPHATE TRANSFER BY NUCLEOSIDE DIPHOSPHATE KINASE: X-RAY STRUCTURES OF A PHOSPHO-HISTIDINE INTERMEDIATE OF THE ENZYMES FROM DROSOPHILA AND DICTYOSTELIUM===




==Overview==
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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.
The line below this paragraph, {{ABSTRACT_PUBMED_7669763}}, adds the Publication Abstract to the page
(as it appears on PubMed at http://www.pubmed.gov), where 7669763 is the PubMed ID number.
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{{ABSTRACT_PUBMED_7669763}}


==About this Structure==
==About this Structure==
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[[Category: Morera, S.]]
[[Category: Morera, S.]]
[[Category: Nucleoside triphosphate: nucleoside diphosphate]]
[[Category: Nucleoside triphosphate: nucleoside diphosphate]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 02:55:55 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 02:57:56 2008''

Revision as of 23:57, 27 July 2008

File:1nsp.png

Template:STRUCTURE 1nsp

MECHANISM OF PHOSPHATE TRANSFER BY NUCLEOSIDE DIPHOSPHATE KINASE: X-RAY STRUCTURES OF A PHOSPHO-HISTIDINE INTERMEDIATE OF THE ENZYMES FROM DROSOPHILA AND DICTYOSTELIUM

Template:ABSTRACT PUBMED 7669763

About this Structure

1NSP is a Single protein structure of sequence from Dictyostelium discoideum. Full crystallographic information is available from OCA.

Reference

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, Biochemistry. 1995 Sep 5;34(35):11062-70. PMID:7669763

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