title: Molecular modelling of human CYP2C subfamily enzymes CYP2C9 and CYP2C19: rationalization of substrate specificity and site-directed mutagenesis experiments in the CYP2C subfamily.
abstract: 1. The results of molecular modelling of human CYP2C isozymes, CYP2C9 and CYP2C19, are reported based on an alignment with a bacterial form of the enzyme, CYP102. 2. The three-dimensional structures of the CYP2C enzymes are consistent with known experimental evidence from site-directed mutagenesis, antibody recognition and regiospecificity of substrate metabolism. 3. The variations in substrate specificity between CYP2C9 and CYP2C19 can be rationalized in terms of single amino acid residue changes within the putative active site region, of which I99H appears to be the most significant.
authors.affiliation: Molecular Toxicology Group, School of Biological Sciences, University of Surrey, Guildford, UK.
authors.forename: D F
authors.initials: DF
authors.lastname: Lewis
authors.forename: M
authors.initials: M
authors.lastname: Dickins
authors.forename: R J
authors.initials: RJ
authors.lastname: Weaver
authors.forename: P J
authors.initials: PJ
authors.lastname: Eddershaw
authors.forename: P S
authors.initials: PS
authors.lastname: Goldfarb
authors.forename: M H
authors.initials: MH
authors.lastname: Tarbit
mesh_terms: D000595:Amino Acid Sequence; D001189:Aryl Hydrocarbon Hydroxylases; D065731:Cytochrome P-450 CYP2C19; D065729:Cytochrome P-450 CYP2C9; D003577:Cytochrome P-450 Enzyme System / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D007527:Isoenzymes / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D006899:Mixed Function Oxygenases / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D016415:Sequence Alignment; D013045:Species Specificity; D039181:Steroid 16-alpha-Hydroxylase; D013250:Steroid Hydroxylases / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D013379:Substrate Specificity
chemical_list: D007527:Isoenzymes; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D013250:Steroid Hydroxylases; C450260:CYP2C9 protein, human; D065729:Cytochrome P-450 CYP2C9; D001189:Aryl Hydrocarbon Hydroxylases; C045793:CYP2C19 protein, human; D065731:Cytochrome P-450 CYP2C19; D039181:Steroid 16-alpha-Hydroxylase