Introduction
The nociceptin opioid peptide receptor (NOP) is also known as the nociceptin/orphanin FQ (N/OFQ) receptor or kappa-type 3 opioid receptor. It is encoded by the OPRL1 gene. The protein encoded by this gene is a member of the 7 transmembrane-spanning G protein-coupled receptor family, and functions as a receptor for the endogenous, opioid-related neuropeptide, nociceptin/orphanin FQ. This receptor-ligand system modulates a variety of biological functions and neurobehavior, including stress responses and anxiety behavior, learning and memory, locomotor activity, and inflammatory and immune responses. A promoter region between this gene and the 5'-adjacent RGS19 (regulator of G-protein signaling 19) gene on the opposite strand functions bi-directionally as a core-promoter for both genes, suggesting co-operative transcriptional regulation of these two functionally related genes. Alternatively spliced transcript variants have been described for this gene. A recent study provided evidence for translational readthrough in this gene, and expression of an additional C-terminally extended isoform via the use of an alternative in-frame translation termination codon. [provided by RefSeq, Dec 2017]

Direction of Drugs Discovery
• OPRL1 Antagonist
• OPRL1 Modulator
• OPRL1 Inhibitor
• OPRL1 Agonist
• OPRL1 Binder
• Developing New Clinical Effects on OPRL1 from Existing Drugs

Drugs
• OPRL1 Antagonist- Banyu Compound-24, peptide III-BTD, BTRX-246040, JTC-801
• OPRL1 Modulator- LY-2940094
• OPRL1 Inhibitor- NOCICEPTIN, PMX-53, 1-benzhydryl-4-hexylpiperidin-4-ol
• OPRL1 Agonist- N/OFQ-(1-13)-NH2, SCH-221510, ND1251, SER-100
• OPRL1 Binder- SR-14136