The cytochrome P450 (CYP) enzymes are a versatile superfamily of heme-containing
monooxygenases, perhaps best known for their role in the oxidation of xenobiotic
compounds. However, due to their unique oxidative chemistry, CYPs are also important in
natural product drug discovery and in the generation of active metabolites with unique
therapeutic properties. New tools for the analysis and production of CYP metabolites,
including microscale analytical technologies and combinatorial biosynthesis, are providing
medicinal chemists with the opportunity to use CYPs as a novel platform for lead discovery
and development. In this review, we will highlight some of the recent examples of drug
leads identified from CYP metabolites and the exciting possibilities of using CYPs as
catalysts for future drug discovery.