1s5o: Difference between revisions
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|SITE= | |SITE= | ||
|LIGAND= <scene name='pdbligand=152:CARNITINE'>152</scene> | |LIGAND= <scene name='pdbligand=152:CARNITINE'>152</scene> | ||
|ACTIVITY= [http://en.wikipedia.org/wiki/Carnitine_O-acetyltransferase Carnitine O-acetyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.1.7 2.3.1.7] | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Carnitine_O-acetyltransferase Carnitine O-acetyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.1.7 2.3.1.7] </span> | ||
|GENE= | |GENE= | ||
|DOMAIN= | |||
|RELATEDENTRY= | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1s5o FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1s5o OCA], [http://www.ebi.ac.uk/pdbsum/1s5o PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1s5o RCSB]</span> | |||
}} | }} | ||
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==Overview== | ==Overview== | ||
We report the crystal structure of a binary complex of human peroxisomal carnitine acetyltransferase and the substrate l-carnitine, refined to a resolution of 1.8 Angstrom with an R(factor) value of 18.9% (R(free)=22.3%). L-carnitine binds to a preformed pocket in the active site tunnel of carnitine acetyltransferase aligned with His(322). The quaternary nitrogen of carnitine forms a pi-cation interaction with Phe(545), while Arg(497) forms an electrostatic interaction with the negatively charged carboxylate group. An extensive hydrogen bond network also occurs between the carboxylate group and Tyr(431), Thr(444), and a bound water molecule. Site-directed mutagenesis and kinetic characterization reveals that Tyr(431), Thr(444), Arg(497), and Phe(545) are essential for high affinity binding of L-carnitine. | We report the crystal structure of a binary complex of human peroxisomal carnitine acetyltransferase and the substrate l-carnitine, refined to a resolution of 1.8 Angstrom with an R(factor) value of 18.9% (R(free)=22.3%). L-carnitine binds to a preformed pocket in the active site tunnel of carnitine acetyltransferase aligned with His(322). The quaternary nitrogen of carnitine forms a pi-cation interaction with Phe(545), while Arg(497) forms an electrostatic interaction with the negatively charged carboxylate group. An extensive hydrogen bond network also occurs between the carboxylate group and Tyr(431), Thr(444), and a bound water molecule. Site-directed mutagenesis and kinetic characterization reveals that Tyr(431), Thr(444), Arg(497), and Phe(545) are essential for high affinity binding of L-carnitine. | ||
==About this Structure== | ==About this Structure== | ||
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[[Category: Pedersen, B.]] | [[Category: Pedersen, B.]] | ||
[[Category: Wu, D.]] | [[Category: Wu, D.]] | ||
[[Category: binary complex]] | [[Category: binary complex]] | ||
[[Category: carnitine acetyltransferase]] | [[Category: carnitine acetyltransferase]] | ||
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[[Category: x-ray structure]] | [[Category: x-ray structure]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 23:37:44 2008'' | ||
