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1t7o

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{{STRUCTURE_1t7o| PDB=1t7o | SCENE= }}
{{STRUCTURE_1t7o| PDB=1t7o | SCENE= }}
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'''Crystal structure of the M564G mutant of murine carnitine acetyltransferase in complex with carnitine'''
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===Crystal structure of the M564G mutant of murine carnitine acetyltransferase in complex with carnitine===
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==Overview==
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Carnitine acyltransferases catalyze the exchange of acyl groups between coenzyme A (CoA) and carnitine. They have important roles in many cellular processes, especially the oxidation of long-chain fatty acids, and are attractive targets for drug discovery against diabetes and obesity. These enzymes are classified based on their substrate selectivity for short-chain, medium-chain, or long-chain fatty acids. Structural information on carnitine acetyltransferase suggests that residues Met-564 and Phe-565 may be important determinants of substrate selectivity with the side chain of Met-564 located in the putative binding pocket for acyl groups. Both residues are replaced by glycine in carnitine palmitoyltransferases. To assess the functional relevance of this structural observation, we have replaced these two residues with small amino acids by mutagenesis, characterized the substrate preference of the mutants, and determined the crystal structures of two of these mutants. Kinetic studies confirm that the M564G or M564A mutation is sufficient to increase the activity of the enzyme toward medium-chain substrates with hexanoyl-CoA being the preferred substrate for the M564G mutant. The crystal structures of the M564G mutant, both alone and in complex with carnitine, reveal a deep binding pocket that can accommodate the larger acyl group. We have determined the crystal structure of the F565A mutant in a ternary complex with both the carnitine and CoA substrates at a 1.8-A resolution. The F565A mutation has minor effects on the structure or the substrate preference of the enzyme.
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(as it appears on PubMed at http://www.pubmed.gov), where 15155726 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15155726}}
==About this Structure==
==About this Structure==
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[[Category: Tong, L.]]
[[Category: Tong, L.]]
[[Category: Transferase]]
[[Category: Transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 00:33:50 2008''

Revision as of 21:33, 27 July 2008

Image:1t7o.png

Template:STRUCTURE 1t7o

Crystal structure of the M564G mutant of murine carnitine acetyltransferase in complex with carnitine

Template:ABSTRACT PUBMED 15155726

About this Structure

1T7O is a Single protein structure of sequence from Mus musculus. Full crystallographic information is available from OCA.

Reference

Structural and biochemical studies of the substrate selectivity of carnitine acetyltransferase., Hsiao YS, Jogl G, Tong L, J Biol Chem. 2004 Jul 23;279(30):31584-9. Epub 2004 May 21. PMID:15155726

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