title: Molecular modelling of CYP2B6, the human CYP2B isoform, by homology with the substrate-bound CYP102 crystal structure: evaluation of CYP2B6 substrate characteristics, the cytochrome b5 binding site and comparisons with CYP2B1 and CYP2B4.
abstract: 1. Molecular modelling studies of CYP2B isoforms from rat (CYP2B1), rabbit (CYP2B4) and man (CYP2B6) are reported, with particular emphasis on substrate interactions with the human CYP2B isoform, CYP2B6. 2. The findings represent an advance on our previous study that focused primarily on the rat CYP2B isoform, CYP2B1, and involved homology modelling with substrate-free CYP102. 3. The current work utilizes the recently published substrate-bound CYP102 crystal structure as a template for construction of the CYP2B subfamily isoforms and shows, in particular, that known CYP2B6 substrate specificity and regioselectivity can be rationalized by putative active site interactions.
authors.affiliation: Molecular Toxicology Group, School of Biological Sciences, University of Surrey, Guildford, UK. d.lewis@surrey.ac.uk
authors.forename: D F
authors.initials: DF
authors.lastname: Lewis
authors.forename: B G
authors.initials: BG
authors.lastname: Lake
authors.forename: M
authors.initials: M
authors.lastname: Dickins
authors.forename: P J
authors.initials: PJ
authors.lastname: Eddershaw
authors.forename: M H
authors.initials: MH
authors.lastname: Tarbit
authors.forename: P S
authors.initials: PS
authors.lastname: Goldfarb
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases; D001426:Bacterial Proteins; D001665:Binding Sites; D018360:Crystallography, X-Ray; D019362:Cytochrome P-450 CYP2B1 / Q000737:chemistry*; D065702:Cytochrome P-450 CYP2B6; D003577:Cytochrome P-450 Enzyme System / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007770:L-Lactate Dehydrogenase / Q000737:chemistry*; D042844:L-Lactate Dehydrogenase (Cytochrome); D006899:Mixed Function Oxygenases / Q000737:chemistry*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D009251:NADPH-Ferrihemoprotein Reductase; D010089:Oxidoreductases, N-Demethylating / Q000737:chemistry*; D011817:Rabbits; D051381:Rats; D017386:Sequence Homology, Amino Acid; D013250:Steroid Hydroxylases / Q000737:chemistry*; D013329:Structure-Activity Relationship; D013379:Substrate Specificity
chemical_list: D001426:Bacterial Proteins; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D007770:L-Lactate Dehydrogenase; D042844:L-Lactate Dehydrogenase (Cytochrome); D013250:Steroid Hydroxylases; D001189:Aryl Hydrocarbon Hydroxylases; C585599:CYP2B6 protein, human; D019362:Cytochrome P-450 CYP2B1; D065702:Cytochrome P-450 CYP2B6; C050356:steroid 15-alpha-hydroxylase; D010089:Oxidoreductases, N-Demethylating; D009251:NADPH-Ferrihemoprotein Reductase; C052423:flavocytochrome P450 BM3 monoxygenases