Cytochrome P450 3A4 inhibition by ketoconazole: tackling the problem of ligand cooperativity using molecular dynamics simulations and free-energy calculations.

Journal of Chemical Information and Modeling
Urban Bren, Chris Oostenbrink

Abstract

Cytochrome P450 3A4 (CYP3A4) metabolizes more than 50% of clinically used drugs and is often involved in adverse drug-drug interactions. It displays atypical binding and kinetic behavior toward a number of ligands characterized by a sigmoidal shape of the corresponding titration curves, which is indicative of a positive homotropic cooperativity. This requires a participation of at least two ligand molecules, whereby the binding of the first ligand molecule increases the affinity of CYP3A4 for the binding of the second ligand molecule. In the current study, a combination of molecular dynamics simulations and free-energy calculations was applied to elucidate the physicochemical origin of the observed positive homotropic cooperativity in ketoconazole binding to CYP3A4. The binding of the first ketoconazole molecule was established to increase the affinity for the binding of the second ketoconazole molecule by 5 kJ mol(-1), which explains and quantifies the experimentally observed cooperative behavior of CYP3A4. Shape complementarity through nonpolar van der Waals interactions was identified as the main driving force of this binding, which seems to be in line with the promiscuous nature of CYP3A4. Moreover, the calculated binding f...Continue Reading

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Citations

Apr 18, 2013·Journal of Computer-aided Molecular Design·Michael M H GrafChris Oostenbrink
Sep 27, 2012·Journal of Chemical Information and Modeling·Nejc CarlDušanka Janežič
Nov 2, 2012·Journal of Chemical Information and Modeling·Samuel Genheden
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