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• W2120823854 abstract "The ligand binding modes of a series of fentanyl derivatives are examined using a combination of conformational analysis and molecular docking to the μ-opioid receptor. Condensed-phase molecular dynamics simulations are applied to evaluate potential relationships between ligand conformation and fentanyl substitution and to generate probable “bioactive” structures for the ligand series. Automated docking of the largely populated solution conformers identified a common binding site orientation that places the N-phenethyl group of fentanyl deep in a crevice between transmembrane (TM) helices II and III while the N-phenylpropanamide group projected toward a pocket formed by TM-III, -VI, and -VII domains. An analysis of the binding modes indicates the most potent fentanyl derivatives adopt an extended conformation both in solution and in the bound state, suggesting binding affinity may depend on the conformational preferences of the ligands. The results are consistent with ligand binding data derived from chimeric and mutant receptor studies as well as structure−activity relationship data reported on a wide range of fentanyl analogues. The binding site model is also compared to that of N-phenethylnormorphine. An overlay of the bound conformation of the opiate and cis-3-methylfentanyl shows the N-phenethyl groups occupy equivalent binding domains in the receptor. While the cationic amines of both ligand classes were found docked to an established anchor site (D149 in TM-III), no overlap was observed between the N-phenylpropanamide group and the remaining components of the opiate scaffold. The unique binding mode(s) proposed for the fentanyl series may, in part, explain the difficulties encountered in defining models of recognition at the μ-receptor and suggest opioid receptors may display multiple binding epitopes. Furthermore, the results provide new insight to the design of experiments aimed at understanding the structural basis to the differential selectivities of ligands at the μ-, δ-, and κ-opioid receptors." @default.
• W2120823854 created "2016-06-24" @default.
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• W2120823854 date "2000-01-25" @default.
• W2120823854 modified "2023-10-16" @default.
• W2120823854 title "Molecular Docking Reveals a Novel Binding Site Model for Fentanyl at the μ-Opioid Receptor" @default.
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• W2120823854 doi "https://doi.org/10.1021/jm9903702" @default.
• W2120823854 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10669565" @default.
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