1f0y: Difference between revisions
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|PDB= 1f0y |SIZE=350|CAPTION= <scene name='initialview01'>1f0y</scene>, resolution 1.80Å | |PDB= 1f0y |SIZE=350|CAPTION= <scene name='initialview01'>1f0y</scene>, resolution 1.80Å | ||
|SITE= | |SITE= | ||
|LIGAND= <scene name='pdbligand=CAA:ACETOACETYL-COENZYME+A'>CAA</scene> | |LIGAND= <scene name='pdbligand=CAA:ACETOACETYL-COENZYME+A'>CAA</scene>, <scene name='pdbligand=NAD:NICOTINAMIDE-ADENINE-DINUCLEOTIDE'>NAD</scene> | ||
|ACTIVITY= [http://en.wikipedia.org/wiki/3-hydroxyacyl-CoA_dehydrogenase 3-hydroxyacyl-CoA dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.35 1.1.1.35] | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/3-hydroxyacyl-CoA_dehydrogenase 3-hydroxyacyl-CoA dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.35 1.1.1.35] </span> | ||
|GENE= | |GENE= | ||
|DOMAIN= | |||
|RELATEDENTRY=[[3had|3HAD]], [[1f12|1F12]], [[1f14|1F14]], [[1f17|1F17]] | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1f0y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1f0y OCA], [http://www.ebi.ac.uk/pdbsum/1f0y PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1f0y RCSB]</span> | |||
}} | }} | ||
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==Overview== | ==Overview== | ||
l-3-Hydroxyacyl-CoA dehydrogenase reversibly catalyzes the conversion of l-3-hydroxyacyl-CoA to 3-ketoacyl-CoA concomitant with the reduction of NAD(+) to NADH as part of the beta-oxidation spiral. In this report, crystal structures have been solved for the apoenzyme, binary complexes of the enzyme with reduced cofactor or 3-hydroxybutyryl-CoA substrate, and an abortive ternary complex of the enzyme with NAD(+) and acetoacetyl-CoA. The models illustrate positioning of cofactor and substrate within the active site of the enzyme. Comparison of these structures with the previous model of the enzyme-NAD(+) complex reveals that although significant shifting of the NAD(+)-binding domain relative to the C-terminal domain occurs in the ternary and substrate-bound complexes, there are few differences between the apoenzyme and cofactor-bound complexes. Analysis of these models clarifies the role of key amino acids implicated in catalysis and highlights additional critical residues. Furthermore, a novel charge transfer complex has been identified in the course of abortive ternary complex formation, and its characterization provides additional insight into aspects of the catalytic mechanism of l-3-hydroxyacyl-CoA dehydrogenase. | l-3-Hydroxyacyl-CoA dehydrogenase reversibly catalyzes the conversion of l-3-hydroxyacyl-CoA to 3-ketoacyl-CoA concomitant with the reduction of NAD(+) to NADH as part of the beta-oxidation spiral. In this report, crystal structures have been solved for the apoenzyme, binary complexes of the enzyme with reduced cofactor or 3-hydroxybutyryl-CoA substrate, and an abortive ternary complex of the enzyme with NAD(+) and acetoacetyl-CoA. The models illustrate positioning of cofactor and substrate within the active site of the enzyme. Comparison of these structures with the previous model of the enzyme-NAD(+) complex reveals that although significant shifting of the NAD(+)-binding domain relative to the C-terminal domain occurs in the ternary and substrate-bound complexes, there are few differences between the apoenzyme and cofactor-bound complexes. Analysis of these models clarifies the role of key amino acids implicated in catalysis and highlights additional critical residues. Furthermore, a novel charge transfer complex has been identified in the course of abortive ternary complex formation, and its characterization provides additional insight into aspects of the catalytic mechanism of l-3-hydroxyacyl-CoA dehydrogenase. | ||
==About this Structure== | ==About this Structure== | ||
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[[Category: Brien, L K.O.]] | [[Category: Brien, L K.O.]] | ||
[[Category: Strauss, A W.]] | [[Category: Strauss, A W.]] | ||
[[Category: abortive ternary complex]] | [[Category: abortive ternary complex]] | ||
''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 20:13:37 2008'' | ||
