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1t7n

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[[Image:1t7n.gif|left|200px]]<br /><applet load="1t7n" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1t7n, resolution 1.90&Aring;" />
 
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'''Crystal structure of the M564G mutant of murine CrAT'''<br />
 
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==Overview==
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==Crystal structure of the M564G mutant of murine CrAT==
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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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<StructureSection load='1t7n' size='340' side='right'caption='[[1t7n]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1t7n]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1T7N OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1T7N FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1t7n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1t7n OCA], [https://pdbe.org/1t7n PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1t7n RCSB], [https://www.ebi.ac.uk/pdbsum/1t7n PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1t7n ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/CACP_MOUSE CACP_MOUSE] Carnitine acetylase is specific for short chain fatty acids. Carnitine acetylase seems to affect the flux through the pyruvate dehydrogenase complex. It may be involved as well in the transport of acetyl-CoA into mitochondria.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/t7/1t7n_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1t7n ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1T7N is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1T7N OCA].
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*[[Carnitine acetyltransferase|Carnitine acetyltransferase]]
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__TOC__
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==Reference==
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</StructureSection>
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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:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=15155726 15155726]
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[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Mus musculus]]
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[[Category: Single protein]]
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[[Category: Hsiao Y-S]]
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[[Category: Hsiao, Y S.]]
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[[Category: Jogl G]]
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[[Category: Jogl, G.]]
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[[Category: Tong L]]
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[[Category: Tong, L.]]
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[[Category: transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:10:43 2008''
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Current revision

Crystal structure of the M564G mutant of murine CrAT

PDB ID 1t7n

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