2c27

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{{STRUCTURE_2c27| PDB=2c27 | SCENE= }}
{{STRUCTURE_2c27| PDB=2c27 | SCENE= }}
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'''THE STRUCTURE OF MYCOTHIOL SYNTHASE IN COMPLEX WITH DES-ACETYLMYCOTHIOL AND COENZYMEA.'''
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===THE STRUCTURE OF MYCOTHIOL SYNTHASE IN COMPLEX WITH DES-ACETYLMYCOTHIOL AND COENZYMEA.===
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==Overview==
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The structure of the ternary complex of mycothiol synthase from Mycobacterium tuberculosis with bound desacetylmycothiol and CoA was determined to 1.8 A resolution. The structure of the acetyl-CoA-binary complex had shown an active site groove that was several times larger than its substrate. The structure of the ternary complex reveals that mycothiol synthase undergoes a large conformational change in which the two acetyltransferase domains are brought together through shared interactions with the functional groups of desacetylmycothiol, thereby decreasing the size of this large central groove. A comparison of the binary and ternary structures illustrates many of the features that promote catalysis. Desacetylmycothiol is positioned with its primary amine in close proximity and in the proper orientation for direct nucleophilic attack on the si-face of the acetyl group of acetyl-CoA. Glu-234 and Tyr-294 are positioned to act as a general base and general acid to promote acetyl transfer. In addition, this structure provides further evidence that the N-terminal acetyltransferase domain no longer has enzymatic activity and is vestigial in nature.
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(as it appears on PubMed at http://www.pubmed.gov), where 16326705 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16326705}}
==About this Structure==
==About this Structure==
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[[Category: Mycobacterium tuberculosis]]
[[Category: Mycobacterium tuberculosis]]
[[Category: Mycothiol synthase]]
[[Category: Mycothiol synthase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 21:08:08 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 16:11:15 2008''

Revision as of 13:11, 27 July 2008

Image:2c27.png

Template:STRUCTURE 2c27

THE STRUCTURE OF MYCOTHIOL SYNTHASE IN COMPLEX WITH DES-ACETYLMYCOTHIOL AND COENZYMEA.

Template:ABSTRACT PUBMED 16326705

About this Structure

2C27 is a Single protein structure of sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA.

Reference

The substrate-induced conformational change of Mycobacterium tuberculosis mycothiol synthase., Vetting MW, Yu M, Rendle PM, Blanchard JS, J Biol Chem. 2006 Feb 3;281(5):2795-802. Epub 2005 Dec 2. PMID:16326705

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