Abstract
Cytochrome P450 mono-oxygenases (P450s) are the principal enzymes involved in the oxidative metabolism of drugs and other xenobiotics. In this protocol, we describe a fluorescence-based, high-throughput assay for measuring the activity of P450 3A4, one of the key enzymes involved in drug metabolism. The assay involves the oxidative debenzylation of a substituted coumarin, yielding an increase in fluorescence on reaction. The entire procedure can be accomplished in 1 h or less.
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