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-Structure paper
| タイトル | Structure-guided allosteric modulation of the delta opioid receptor. |
|---|---|
| ジャーナル・号・ページ | bioRxiv, Year 2025 |
| 掲載日 | 2025年10月17日 |
著者 | Jesse I Mobbs / M Deborah Nguyen / Owindeep Deo / Damian Bartuzi / Hariprasad Venugopal / Sadia Alvi / Vi Pham / Nick Barnes / Arthur Christopoulos / Daniel P Poole / Simona E Carbone / Manuela Jörg / Ben Capuano / Jens Carlsson / Arisbel B Gondin / Peter J Scammells / Celine Valant / David M Thal / ![]() |
| PubMed 要旨 | Opioid analgesics remain essential for pain management but are associated with significant adverse effects, including respiratory depression, tolerance, and dependence. The δ-opioid receptor (δOR) ...Opioid analgesics remain essential for pain management but are associated with significant adverse effects, including respiratory depression, tolerance, and dependence. The δ-opioid receptor (δOR) represents a promising therapeutic target for developing safer opioid analgesics with reduced adverse effects compared to conventional μ-opioid receptor-targeting drugs. Positive allosteric modulators (PAMs) offer advantages over direct agonists by enhancing endogenous opioid signaling while preserving natural spatiotemporal activation patterns, potentially avoiding tolerance and dependence issues. Here, we present high-resolution cryo-EM structures of δOR complexed with the peptide agonist DADLE and the PAM MIPS3614, revealing a novel lipid-facing allosteric binding site formed by transmembrane helices 2, 3, and 4. MIPS3614 stabilizes the active receptor conformation through a critical hydrogen bond with residue N131 in the conserved sodium binding site, a key regulatory region controlling GPCR activation. Comprehensive mutagenesis, molecular dynamics simulations, and structure-activity relationships validate this proposed mechanism. Structure-guided optimization yielded MIPS3983 with enhanced binding affinity and retained cooperativity. Our findings establish the first molecular framework for δOR allosteric modulation and provide a structural foundation for the rational design of safer opioid therapeutics. |
リンク | bioRxiv / PubMed:41280124 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 1.94 - 2.29 Å |
| 構造データ | EMDB-72825, PDB-9ydp: EMDB-72826, PDB-9ydq: EMDB-72827, PDB-9ydr: ![]() EMDB-72828: receptor focused refinement of human delta opioid receptor complex with mini-Gi and DADLE ![]() EMDB-72829: receptor focused refinement of the human delta opioid complex with mini-Gi, agonist DADLE and allosteric modulator MIPS3614 ![]() EMDB-72830: receptor focused refinement of human delta opioid receptor complex with mini-Gi, agonist DADLE and allosteric modulator MIPS3983 ![]() EMDB-72831: conensus map of the human delta opioid complex with mini-Gi, agonist DADLE and allosteric modulator BMS-986187 ![]() EMDB-72832: receptor focused refinement of human delta opioid complex with mini-Gi, agonist DADLE and allosteric modulator BMS-986187 |
| 化合物 | ![]() ChemComp-HOH: ![]() PDB-1cvg: ![]() PDB-1cu8: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / GPCR / opioid receptor / ligand binding / allosteric modulation |
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