Mechanism of drug-drug interactions mediated by human cytochrome P450 CYP3A4 monomer

Biochemistry
I G DenisovStephen Sligar

Abstract

Using Nanodiscs, we quantitate the heterotropic interaction between two different drugs mediated by monomeric CYP3A4 incorporated into a nativelike membrane environment. The mechanism of this interaction is deciphered by global analysis of multiple-turnover experiments performed under identical conditions using the pure substrates progesterone (PGS) and carbamazepine (CBZ) and their mixtures. Activation of CBZ epoxidation and simultaneous inhibition of PGS hydroxylation are measured and quantitated through differences in their respective affinities for both a remote allosteric site and the productive catalytic site near the heme iron. Preferred binding of PGS at the allosteric site and a stronger preference for CBZ binding at the productive site give rise to a nontrivial drug-drug interaction. Molecular dynamics simulations indicate functionally important conformational changes caused by PGS binding at the allosteric site and by two CBZ molecules positioned inside the substrate binding pocket. Structural changes involving Phe-213, Phe-219, and Phe-241 are thought to be responsible for the observed synergetic effects and positive allosteric interactions between these two substrates. Such a mechanism is likely of general relevanc...Continue Reading

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