A Three-Site Mechanism for Agonist/Antagonist Selective Binding to Vasopressin Receptors

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• 作者：Noureldin Saleh ; Dr. Giorgio Saladino ; Prof. Dr. Francesco L. Gervasio ; Elke Haensele ; Dr. Lee Banting ; Dr. David C. Whitley ; Prof. Dr. Jana Sopkova-de Oliveira Santos ; Prof. Ronan Bureau and Prof. Dr. Timothy Clark
• 刊名：Angewandte Chemie International Edition
• 出版年：2016
• 出版时间：July 4, 2016
• 年：2016
• 卷：55
• 期：28
• 页码：8008-8012
• 全文大小：2420K
• ISSN：1521-3773

文摘

Molecular-dynamics simulations with metadynamics enhanced sampling reveal three distinct binding sites for arginine vasopressin (AVP) within its V₂-receptor (V₂R). Two of these, the vestibule and intermediate sites, block (antagonize) the receptor, and the third is the orthosteric activation (agonist) site. The contacts found for the orthosteric site satisfy all the requirements deduced from mutagenesis experiments. Metadynamics simulations for V₂R and its V_1aR-analog give an excellent correlation with experimental binding free energies by assuming that the most stable binding site in the simulations corresponds to the experimental binding free energy in each case. The resulting three-site mechanism separates agonists from antagonists and explains subtype selectivity.