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[[Image:1kp2.jpg|left|200px]]
{{Seed}}
[[Image:1kp2.png|left|200px]]


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{{STRUCTURE_1kp2|  PDB=1kp2  |  SCENE=  }}  
{{STRUCTURE_1kp2|  PDB=1kp2  |  SCENE=  }}  


'''Crystal Structure of E. coli Argininosuccinate Synthetase in Complex with ATP'''
===Crystal Structure of E. coli Argininosuccinate Synthetase in Complex with ATP===




==Overview==
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Argininosuccinate synthetase (AS) is the rate-limiting enzyme of both the urea and arginine-citrulline cycles. In mammals, deficiency of AS leads to citrullinemia, a debilitating and often fatal autosomal recessive urea cycle disorder, whereas its overexpression for sustained nitric oxide production via the arginine-citrulline cycle leads to the potentially fatal hypotension associated with septic and cytokine-induced circulatory shock. The crystal structures of Escherichia coli argininosuccinate synthetase (EAS) in complex with ATP and with ATP and citrulline have been determined at 2.0-A resolution. These are the first EAS structures to be solved in the presence of a nucleotide substrate and clearly identify the residues that interact with both ATP and citrulline. Two distinct conformations are revealed for ATP, both of which are believed to be catalytically relevant. In addition, comparisons of these EAS structures with those of the apoenzyme and EAS complexed with aspartate and citrulline (Lemke, C. T., and Howell, P. L. (2001) Structure (Lond.) 9, 1153-1164) provide structural evidence of ATP-induced conformational changes in the nucleotide binding domain. Combined, these structures also provide structural explanations of some of the observed kinetic properties of the enzyme and have enabled a detailed enzymatic mechanism of AS catalysis to be proposed.
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{{ABSTRACT_PUBMED_11809762}}


==About this Structure==
==About this Structure==
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[[Category: Lemke, C T.]]
[[Category: Lemke, C T.]]
[[Category: N-type atp pyrophosphatase]]
[[Category: N-type atp pyrophosphatase]]
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Revision as of 07:41, 2 July 2008

File:1kp2.png

Template:STRUCTURE 1kp2

Crystal Structure of E. coli Argininosuccinate Synthetase in Complex with ATP

Template:ABSTRACT PUBMED 11809762

About this Structure

1KP2 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Substrate induced conformational changes in argininosuccinate synthetase., Lemke CT, Howell PL, J Biol Chem. 2002 Apr 12;277(15):13074-81. Epub 2002 Jan 23. PMID:11809762

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