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Cytochrome P450 3A4 (CYP3A4) is involved in the metabolism of a majority of drugs. Heterotropic cooperativity of drug binding to CYP3A4 was examined with the flavanoid, α-naphthoflavone (ANF) and the steroid, testosterone (TST). UV–vis and EPR spectroscopy of CYP3A4 show that ANF binding to CYP3A4 occurs with apparent negative cooperativity and that there are at least two binding sites: (1) a relatively...
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