8Y45

Cryo-EM structure of opioid receptor with biased agonist

This is a non-PDB format compatible entry.

Summary for 8Y45

• Entry DOI: 10.2210/pdb8y45/pdb
• EMDB information: 38909
• Descriptor: Delta-type opioid receptor, Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1, Guanine nucleotide-binding protein G(i) subunit alpha-2, ... (6 entities in total)
• Functional Keywords: structural protein, signaling protein
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 5
• Total formula weight: 152917.32

Authors

Lin, C.,Chang, Z. (deposition date: 2024-01-30, release date: 2024-11-27)

Primary citation

Cheng, L.,Miao, Z.,Liu, S.,Li, Z.,Fu, H.,Xu, C.,Hu, S.,Zhao, C.,Liu, Y.,Zhao, T.,Liu, W.,Wang, H.,Liu, R.,Yan, W.,Tang, X.,Liu, J.,Shao, Z.,Ke, B.
Cryo-EM structure of small-molecule agonist bound delta opioid receptor-G i complex enables discovery of biased compound.
Nat Commun, 15:8284-8284, 2024

PubMed Abstract: Delta opioid receptor (δOR) plays a pivotal role in modulating human sensation and emotion. It is an attractive target for drug discovery since, unlike Mu opioid receptor, it is associated with low risk of drug dependence. Despite its potential applications, the pharmacological properties of δOR, including the mechanisms of activation by small-molecule agonists and the complex signaling pathways it engages, as well as their relation to the potential side effects, remain poorly understood. In this study, we use cryo-electron microscopy (cryo-EM) to determine the structure of the δOR-G complex when bound to a small-molecule agonist (ADL5859). Moreover, we design a series of probes to examine the key receptor-ligand interaction site and identify a region involved in signaling bias. Using ADL06 as a chemical tool, we elucidate the relationship between the β-arrestin pathway of the δOR and its biological functions, such as analgesic tolerance and convulsion activities. Notably, we discover that the β-arrestin recruitment of δOR might be linked to reduced gastrointestinal motility. These insights enhance our understanding of δOR's structure, signaling pathways, and biological functions, paving the way for the structure-based drug discovery.

PubMed: 39333070
DOI: 10.1038/s41467-024-52601-1

Experimental method

ELECTRON MICROSCOPY (3.45 Å)