2j0d

From Proteopedia

Revision as of 17:32, 18 December 2007

CRYSTAL STRUCTURE OF HUMAN P450 3A4 IN COMPLEX WITH ERYTHROMYCIN

Overview

Cytochrome P450 (CYP) 3A4 is the most promiscuous of the human CYP enzymes, and contributes to the metabolism of approximately 50% of marketed drugs., It is also the isoform most often involved in unwanted drug-drug, interactions. A better understanding of the molecular mechanisms governing, CYP3A4-ligand interaction therefore would be of great importance to any, drug discovery effort. Here, we present crystal structures of human CYP3A4, in complex with two well characterized drugs: ketoconazole and, erythromycin. In contrast to previous reports, the protein undergoes, dramatic conformational changes upon ligand binding with an increase in, the active site volume by >80%. The structures represent two distinct open, conformations of CYP3A4 because ketoconazole and erythromycin induce, different types of coordinate shifts. The binding of two molecules of, ketoconazole to the CYP3A4 active site and the clear indication of, multiple binding modes for erythromycin has implications for the, interpretation of the atypical kinetic data often displayed by CYP3A4. The, extreme flexibility revealed by the present structures also challenges any, attempt to apply computational design tools without the support of, relevant experimental data.

About this Structure

2J0D is a Single protein structure of sequence from Homo sapiens with ERY and HEM as ligands. The following page contains interesting information on the relation of 2J0D with [Cytochrome p450]. Known structural/functional Site: . Full crystallographic information is available from OCA.

Reference

Structural basis for ligand promiscuity in cytochrome P450 3A4., Ekroos M, Sjogren T, Proc Natl Acad Sci U S A. 2006 Sep 12;103(37):13682-7. Epub 2006 Sep 5. PMID:16954191

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