Tyrosine phosphorylation of the kappa -opioid receptor regulates agonist efficacy.


To explore the role of highly conserved tyrosine residues in the putative cytoplasmic domains of the seven-transmembrane G protein-coupled opioid receptors, we expressed the rat kappa-opioid receptor (KOR) in Xenopus oocytes and then activated the intrinsic insulin receptor tyrosine kinase. KOR activation by the agonist produced a strong increase in… (More)


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