2c27
From Proteopedia
The Structure of Mycothiol Synthase in Complex with des- AcetylMycothiol and CoenzymeA.
Structural highlights
FunctionMSHD_MYCTU Catalyzes the transfer of acetyl from acetyl-CoA to desacetylmycothiol (Cys-GlcN-Ins) to form mycothiol.[1] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe 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. 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[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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