| Structural highlights
Function
C562_ECOLX Electron-transport protein of unknown function.OPRX_HUMAN G-protein coupled opioid receptor that functions as a receptor for the endogenous neuropeptide nociceptin. Ligand binding causes a conformation change that triggers signaling via guanine nucleotide-binding proteins (G proteins) and modulates the activity of down-stream effectors. Signaling via G proteins mediates inhibition of adenylate cyclase activity and calcium channel activity. Arrestins modulate signaling via G proteins and mediate the activation of alternative signaling pathways that lead to the activation of MAP kinases. Plays a role in modulating nociception and the perception of pain. Plays a role in the regulation of locomotor activity by the neuropeptide nociceptin.[1] [2] [3] [4] [5]
Publication Abstract from PubMed
Understanding the mechanism by which ligands affect receptor conformational equilibria is key in accelerating membrane protein structural biology. In the case of G protein-coupled receptors (GPCRs), we currently pursue a brute-force approach for identifying ligands that stabilize receptors and facilitate crystallogenesis. The nociceptin/orphanin FQ peptide receptor (NOP) is a member of the opioid receptor subfamily of GPCRs for which many structurally diverse ligands are available for screening. We observed that antagonist potency is correlated with a ligand's ability to induce receptor stability (Tm) and crystallogenesis. Using this screening strategy, we solved two structures of NOP in complex with top candidate ligands SB-612111 and C-35. Docking studies indicate that while potent, stabilizing antagonists strongly favor a single binding orientation, less potent ligands can adopt multiple binding modes, contributing to their low Tm values. These results suggest a mechanism for ligand-aided crystallogenesis whereby potent antagonists stabilize a single ligand-receptor conformational pair.
The Importance of Ligand-Receptor Conformational Pairs in Stabilization: Spotlight on the N/OFQ G Protein-Coupled Receptor.,Miller RL, Thompson AA, Trapella C, Guerrini R, Malfacini D, Patel N, Han GW, Cherezov V, Calo G, Katritch V, Stevens RC Structure. 2015 Oct 24. pii: S0969-2126(15)00407-4. doi:, 10.1016/j.str.2015.07.024. PMID:26526853[6]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Serhan CN, Fierro IM, Chiang N, Pouliot M. Cutting edge: nociceptin stimulates neutrophil chemotaxis and recruitment: inhibition by aspirin-triggered-15-epi-lipoxin A4. J Immunol. 2001 Mar 15;166(6):3650-4. doi: 10.4049/jimmunol.166.6.3650. PMID:11238602 doi:http://dx.doi.org/10.4049/jimmunol.166.6.3650
- ↑ Spampinato S, Di Toro R, Alessandri M, Murari G. Agonist-induced internalization and desensitization of the human nociceptin receptor expressed in CHO cells. Cell Mol Life Sci. 2002 Dec;59(12):2172-83. doi: 10.1007/s000180200016. PMID:12568343 doi:http://dx.doi.org/10.1007/s000180200016
- ↑ Thompson AA, Liu W, Chun E, Katritch V, Wu H, Vardy E, Huang XP, Trapella C, Guerrini R, Calo G, Roth BL, Cherezov V, Stevens RC. Structure of the nociceptin/orphanin FQ receptor in complex with a peptide mimetic. Nature. 2012 May 16;485(7398):395-9. doi: 10.1038/nature11085. PMID:22596163 doi:10.1038/nature11085
- ↑ Zhang NR, Planer W, Siuda ER, Zhao HC, Stickler L, Chang SD, Baird MA, Cao YQ, Bruchas MR. Serine 363 is required for nociceptin/orphanin FQ opioid receptor (NOPR) desensitization, internalization, and arrestin signaling. J Biol Chem. 2012 Dec 7;287(50):42019-30. doi: 10.1074/jbc.M112.405696. Epub 2012, Oct 19. PMID:23086955 doi:http://dx.doi.org/10.1074/jbc.M112.405696
- ↑ Mollereau C, Parmentier M, Mailleux P, Butour JL, Moisand C, Chalon P, Caput D, Vassart G, Meunier JC. ORL1, a novel member of the opioid receptor family. Cloning, functional expression and localization. FEBS Lett. 1994 Mar 14;341(1):33-8. doi: 10.1016/0014-5793(94)80235-1. PMID:8137918 doi:http://dx.doi.org/10.1016/0014-5793(94)80235-1
- ↑ Miller RL, Thompson AA, Trapella C, Guerrini R, Malfacini D, Patel N, Han GW, Cherezov V, Calo G, Katritch V, Stevens RC. The Importance of Ligand-Receptor Conformational Pairs in Stabilization: Spotlight on the N/OFQ G Protein-Coupled Receptor. Structure. 2015 Oct 24. pii: S0969-2126(15)00407-4. doi:, 10.1016/j.str.2015.07.024. PMID:26526853 doi:http://dx.doi.org/10.1016/j.str.2015.07.024
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