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A Three‐Site Mechanism for Agonist/Antagonist Selective Binding to Vasopressin Receptors |
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| Authors: | 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 Prof Dr Timothy Clark |
| Institution: | 1. Computer-Chemie-Centrum, Friedrich-Alexander-Universit?t Erlangen-Nürnberg, Erlangen, Germany;2. Department of Chemistry and Institute of Structural and Molecular Biology, University College London, London, UK;3. School of Pharmacy and Biomedical Sciences, University of Portsmouth, Portsmouth, UK;4. UNICAEN, CERMN, UPRES EA 4258, FR CNRS 3038 INC3M —, Normandie Univ., CAEN Cedex, France |
| Abstract: | 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 V1aR‐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. |
| Keywords: | G-protein coupled receptors hormones metadynamics molecular dynamics receptors |