Ac-RYYRWK-NH2 TFA

Ac-RYYRWK-NH2 is a potent and selective partial agonist for the nociceptin receptor (NOP), [3H]Ac-RYYRWK-NH2 binds to rat cortical membranes ORL1 with a Kd of 0.071 nM, but has no affinity for μ-, κ- or δ-opioid receptors[1].

NOP Receptor/ORL1

[1] C T Dooley, et al. Binding and in vitro activities of peptides with high affinity for the nociceptin/orphanin FQ receptor, ORL1.J Pharmacol Exp Ther. 1997 Nov;283(2):735-41. PMID:9353393
[2] M Ho, et al, Characterization of the ORL(1) receptor on adrenergic nerves in the rat anococcygeus muscle. Br J Pharmacol. 2000 Sep;131(2):349-55. DOI:10.1038/sj.bjp.0703583