Consensus 3D model of μ-opioid receptor ligand efficacy based on a quantitative Conformationally Sampled Pharmacophore.

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TitleConsensus 3D model of μ-opioid receptor ligand efficacy based on a quantitative Conformationally Sampled Pharmacophore.
Publication TypeJournal Article
Year of Publication2011
AuthorsShim, J, Coop, A, Mackerell, AD
JournalJ Phys Chem B
Volume115
Issue22
Pagination7487-96
Date Published2011 Jun 09
ISSN1520-5207
KeywordsLigands, Molecular Dynamics Simulation, Peptides, Protein Structure, Tertiary, Receptors, Opioid, mu, Structure-Activity Relationship, Thebaine
Abstract

Despite being studied for over 30 years, a consensus structure-activity relationship (SAR) that encompasses the full range peptidic and nonpeptidic μ-opioid receptor ligands is still not available. To achieve a consensus SAR the Conformationally Sampled Pharmacophore (CSP) method was applied to develop a predictive model of the efficacy of μ-opioid receptor ligands. Emphasis was placed on predicting the efficacy of a wide range of agonists, partial agonists, and antagonists as well as understanding their mode of interaction with the receptor. Inclusion of all accessible conformations of each ligand, a central feature of the CSP method, enabled structural features between diverse μ-opioid receptor ligands that dictate efficacy to be identified. The models were validated against a diverse collection of peptidic and nonpeptidic ligands, including benzomorphans, fentanyl (4-anilinopiperidine), methadone (3,3-diphenylpropylamines), etonitazene (benzimidazole derivatives), funaltrexamine (C6-substituted 4,5-epoxymorphinan), and herkinorin. The model predicts (1) that interactions of ligands with the B site, as with the 19-alkyl substituents of oripavines, modulate the extent of agonism; (2) that agonists with long N-substituents, as with fentanyl and N-phenethylnormorphine, can bind in an orientation such that the N substitutent interacts with the B site that also allows the basic N-receptor Asp interaction essential for agonism; and (3) that the μ agonist herkinorin, that lacks a basic nitrogen, binds to the receptor in a manner similar to the traditional opioids via interactions mediated by water or a ion. Importantly, the proposed CSP model can be reconciled with previously published SAR models for the μ receptor.

DOI10.1021/jp202542g
Alternate JournalJ Phys Chem B
PubMed ID21563754
PubMed Central IDPMC3113728
Grant ListK02 DA019634 / DA / NIDA NIH HHS / United States
R01 DA013583 / DA / NIDA NIH HHS / United States
R01 DA013583-10 / DA / NIDA NIH HHS / United States
DA13583 / DA / NIDA NIH HHS / United States
DA19634 / DA / NIDA NIH HHS / United States