1p7t: Difference between revisions

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[[Image:1p7t.jpg|left|200px]]
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[[Image:1p7t.png|left|200px]]


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{{STRUCTURE_1p7t|  PDB=1p7t  |  SCENE=  }}  
{{STRUCTURE_1p7t|  PDB=1p7t  |  SCENE=  }}  


'''Structure of Escherichia coli malate synthase G:pyruvate:acetyl-Coenzyme A abortive ternary complex at 1.95 angstrom resolution'''
===Structure of Escherichia coli malate synthase G:pyruvate:acetyl-Coenzyme A abortive ternary complex at 1.95 angstrom resolution===




==Overview==
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Malate synthase, an enzyme of the glyoxylate pathway, catalyzes the condensation and subsequent hydrolysis of acetyl-coenzyme A (acetyl-CoA) and glyoxylate to form malate and CoA. In the present study, we present the 1.95 A-resolution crystal structure of Escherichia coli malate synthase isoform G in complex with magnesium, pyruvate, and acetyl-CoA, and we compare it with previously determined structures of substrate and product complexes. The results reveal how the enzyme recognizes and activates the substrate acetyl-CoA, as well as conformational changes associated with substrate binding, which may be important for catalysis. On the basis of these results and mutagenesis of active site residues, Asp 631 and Arg 338 are proposed to act in concert to form the enolate anion of acetyl-CoA in the rate-limiting step. The highly conserved Cys 617, which is immediately adjacent to the presumed catalytic base Asp 631, appears to be oxidized to cysteine-sulfenic acid. This can explain earlier observations of the susceptibility of the enzyme to inactivation and aggregation upon X-ray irradiation and indicates that cysteine oxidation may play a role in redox regulation of malate synthase activity in vivo. There is mounting evidence that enzymes of the glyoxylate pathway are virulence factors in several pathogenic organisms, notably Mycobacterium tuberculosis and Candida albicans. The results described in this study add insight into the mechanism of catalysis and may be useful for the design of inhibitory compounds as possible antimicrobial agents.
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{{ABSTRACT_PUBMED_12930982}}


==About this Structure==
==About this Structure==
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[[Category: Glyoxylate cycle]]
[[Category: Glyoxylate cycle]]
[[Category: Tim barrel]]
[[Category: Tim barrel]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 04:47:30 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 12:08:53 2008''

Revision as of 09:08, 29 July 2008

File:1p7t.png

Template:STRUCTURE 1p7t

Structure of Escherichia coli malate synthase G:pyruvate:acetyl-Coenzyme A abortive ternary complex at 1.95 angstrom resolution

Template:ABSTRACT PUBMED 12930982

About this Structure

1P7T is a Protein complex structure of sequences from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Structure of the Escherichia coli malate synthase G:pyruvate:acetyl-coenzyme A abortive ternary complex at 1.95 A resolution., Anstrom DM, Kallio K, Remington SJ, Protein Sci. 2003 Sep;12(9):1822-32. PMID:12930982

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