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. 1994 Apr 26;91(9):3779–3783. doi: 10.1073/pnas.91.9.3779

Primary structure and functional expression of a guinea pig kappa opioid (dynorphin) receptor.

G X Xie 1, F Meng 1, A Mansour 1, R C Thompson 1, M T Hoversten 1, A Goldstein 1, S J Watson 1, H Akil 1
PMCID: PMC43665  PMID: 8170987

Abstract

A full-length cDNA encoding the guinea pig kappa opioid (dynorphin) receptor has been isolated. The deduced protein contains 380 aa and seven hydrophobic alpha-helices characteristic of the G protein-coupled receptors. This receptor is 90% identical to the mouse and rat kappa receptors, with the greatest level of divergence in the N-terminal region. When expressed in COS-7 cells, the receptor displays high affinity and stereospecificity toward dynorphin peptides and other kappa-selective opioid ligands such as U50, 488. It does not bind the mu- and delta-selective opioid ligands. The expressed receptor is functionally coupled to G protein(s) to inhibit adenylyl cyclase and Ca2+ channels. The guinea pig kappa receptor mRNA is expressed in many brain areas, including the cerebellum, a pattern that agrees well with autoradiographic maps of classical guinea pig kappa binding sites. Species differences in the pharmacology and mRNA distribution between the cloned guinea pig and rat kappa receptors may be worthy of further examination.

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Selected References

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