The Human Nuclear Xenobiotic Receptor PXR: Structural Determinants of Directed Promiscuity
2001; American Association for the Advancement of Science; Volume: 292; Issue: 5525 Linguagem: Inglês
10.1126/science.1060762
ISSN1095-9203
AutoresRyan E. Watkins, G. Bruce Wisely, Linda B. Moore, Jon L. Collins, Millard H. Lambert, Shawn P. Williams, Timothy M. Willson, Steven A. Kliewer, Matthew R. Redinbo,
Tópico(s)Hormonal Regulation and Hypertension
ResumoThe human nuclear pregnane X receptor (hPXR) activates cytochrome P450-3A expression in response to a wide variety of xenobiotics and plays a critical role in mediating dangerous drug-drug interactions. We present the crystal structures of the ligand-binding domain of hPXR both alone and in complex with the cholesterol-lowering drug SR12813 at resolutions of 2.5 and 2.75 angstroms, respectively. The hydrophobic ligand-binding cavity of hPXR contains a small number of polar residues, permitting SR12813 to bind in three distinct orientations. The position and nature of these polar residues were found to be critical for establishing the precise pharmacologic activation profile of PXR. Our findings provide important insights into how hPXR detects xenobiotics and may prove useful in predicting and avoiding drug-drug interactions.
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