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JM Rimland, EP Seward, Y Humbert, E Ratti, DG Trist and RA North
Glaxo Research Laboratories, Verona, Italy.
Xenopus oocytes were injected with RNAs for the two inward-rectifier potassium channel subunits Kir3.1 (GIRK1) and Kir3.4 (rcKATP or CIR) in addition to RNA from the neuroblastoma cell line KAN-TS. Potassium currents were evoked by neuropeptide Y in oocytes injected with polyadenylated RNA or with cRNA from pools of a neuroblastoma (KAN-TS) cDNA library, and progressive subdivision of responding pools yielded a single cDNA. The encoded protein contains 381 amino acids, has the seven hydrophobic domains characteristic of G protein-coupled receptors, and is 31% identical to the Y1 receptor: potassium currents were induced by neuropeptide Y (EC50=60pm) and Y2-selective analogues. Coexpression with potassium channel subunits will be a generally useful method for the cloning of G protein-coupled receptors.
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