title: Molecular modelling of CYP1 family enzymes CYP1A1, CYP1A2, CYP1A6 and CYP1B1 based on sequence homology with CYP102.
abstract: Molecular modelling of a number of CYP1 family enzymes from rat, plaice and human is described based on amino acid sequence homology with the haemoprotein domain of CYP102, a unique bacterial P450 of known structure. The interaction of various substrates and inhibitors within the putative active sites of rat CYP1A1, human CYP1A2, a fish CYP1 enzyme CYP1A6 (from plaice) and human CYP1B1, is shown to be consistent with P450-mediated oxidation in each example or, in the case of inhibitors, mechanism of inhibition. It is reported that relatively small changes between the enzymes' active site regions assist in the rationalization of CYP1 enzyme preferences for particular substrate types, and a template of superimposed CYP1A2 substrates is shown to fit the putative active site of the human CYP1A2 enzyme.
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: S G
authors.initials: SG
authors.lastname: George
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: A P
authors.initials: AP
authors.lastname: Beresford
authors.forename: P S
authors.initials: PS
authors.lastname: Goldfarb
authors.forename: F P
authors.initials: FP
authors.lastname: Guengerich
mesh_terms: D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases; D001426:Bacterial Proteins; D006224:Cricetinae; D019363:Cytochrome P-450 CYP1A1 / Q000037:antagonists & inhibitors / Q000737:chemistry* / Q000235:genetics; D019388:Cytochrome P-450 CYP1A2 / Q000737:chemistry* / Q000235:genetics; D065609:Cytochrome P-450 CYP1A2 Inhibitors; D065633:Cytochrome P-450 CYP1B1; D065607:Cytochrome P-450 Enzyme Inhibitors; D003577:Cytochrome P-450 Enzyme System / Q000737:chemistry* / Q000235:genetics; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005412:Flatfishes; D006801:Humans; D006860:Hydrogen Bonding; D051379:Mice; D006899:Mixed Function Oxygenases / Q000037:antagonists & inhibitors / Q000737:chemistry* / Q000235:genetics; D008958:Models, Molecular; D016297:Mutagenesis, Site-Directed; D009251:NADPH-Ferrihemoprotein Reductase; D010084:Oxidation-Reduction; D011817:Rabbits; D051381:Rats; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity; D013329:Structure-Activity Relationship; D015262:Xenobiotics / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D065609:Cytochrome P-450 CYP1A2 Inhibitors; D065607:Cytochrome P-450 Enzyme Inhibitors; D004791:Enzyme Inhibitors; D015262:Xenobiotics; C402671:cytochrome P-450 CYP1A6 (fish); D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D001189:Aryl Hydrocarbon Hydroxylases; C585496:CYP1B1 protein, human; C585498:Cyp1b1 protein, mouse; C585499:Cyp1b1 protein, rat; D019363:Cytochrome P-450 CYP1A1; D019388:Cytochrome P-450 CYP1A2; D065633:Cytochrome P-450 CYP1B1; D009251:NADPH-Ferrihemoprotein Reductase; C052423:flavocytochrome P450 BM3 monoxygenases