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Nature March 9, 1995; 374 (6518): 135-41.

The G-protein-gated atrial K+ channel IKACh is a heteromultimer of two inwardly rectifying K(+)-channel proteins.

Krapivinsky G , Gordon EA , Wickman K , Velimirovi B , Krapivinsky L , Clapham DE .

Heart rate is slowed in part by acetylcholine-dependent activation of a cardiac potassium (K+) channel, IKACh. Activated muscarinic receptors stimulate IKACh via the G-protein beta gamma-subunits. It has been assumed that the inwardly rectifying K(+)-channel gene, GIRK1, alone encodes IKACh. It is now shown that IKACh is a heteromultimer of two distinct inwardly rectifying K(+)-channel subunits, GIRK1 and a newly cloned member of the family, CIR.

PubMed ID: 7877685
Article link: Nature

Species referenced: Xenopus
Genes referenced: cir1 kcnj3 kcnj5