title: CypScore: Quantitative prediction of reactivity toward cytochromes P450 based on semiempirical molecular orbital theory.
abstract: CypScore is an in silico approach for predicting the likely sites of cytochrome P450-mediated metabolism of druglike organic molecules. It consists of multiple models for the most important P450 oxidation reactions such as aliphatic hydroxylation, N-dealkylation, O-dealkylation, aromatic hydroxylation, double-bond oxidation, N-oxidation, and S-oxidation. Each of these models is based on atomic reactivity descriptors derived from surface-based properties calculated with ParaSurf and based on AM1 semiempirical molecular orbital theory. The models were trained with data derived from Bayer Schering Pharma's in-house MajorMetabolite Database with more than 2300 transformations and more than 800 molecules collected from the primary literature. The models have been balanced to allow the treatment of relative intramolecular, intra-chemotype, and inter-chemotype reactivities of the labile sites toward oxidation. The models were evaluated with promising hit rates on three public datasets of varying quality in the annotation of the experimental positions. For 39 well-characterized compounds from 14 in-house lead optimization programs, we could detect at least one major metabolite for the three highest-ranked positions in 87 % of the compounds and overall more than 62 % of all major metabolites, with promising true- to false-positive ratios of 0.9.
authors.affiliation: Computer-Chemie-Centrum and Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Hennemann
authors.forename: Arno
authors.initials: A
authors.lastname: Friedl
authors.forename: Mario
authors.initials: M
authors.lastname: Lobell
authors.forename: Jörg
authors.initials: J
authors.lastname: Keldenich
authors.forename: Alexander
authors.initials: A
authors.lastname: Hillisch
authors.forename: Timothy
authors.initials: T
authors.lastname: Clark
authors.forename: Andreas H
authors.initials: AH
authors.lastname: Göller
mesh_terms: D020650:Combinatorial Chemistry Techniques; D019295:Computational Biology; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D004852:Epoxy Compounds / Q000737:chemistry; D008954:Models, Biological; D015394:Molecular Structure; D010084:Oxidation-Reduction; D013329:Structure-Activity Relationship; D013379:Substrate Specificity
chemical_list: D004852:Epoxy Compounds; D003577:Cytochrome P-450 Enzyme System