Functional characterization and localization of a cardiac-type inwardly rectifying K+ channel.
We cloned inwardly rectifying K+ channel cDNAs from porcine, rat and human, which were structurally almost identical with recently reported CIR(cKATP-1). The expression of CIR alone was low and unstable in Xenopus oocytes. The CIR/GIRK1 co-expression showed an increased current amplitude. Both the CIR and CIR/GIRK1 currents increased by coexpressing G beta gamma. The CIR and CIR/GIRK1 currents displayed two qualitative differences. (1) The conductance of the CIR channel did not saturate, but that of the CIR/GIRK1 channel showed saturation at hyperpolarized potential. (2) The CIR current showed instantaneous activation upon hyperpolarization, whereas the CIR/GIRK1 current exhibited slow activation, which was fitted by the sum of two exponentials. The CIR/GIRK1 current was also different from the GIRK1 current. The activation of the CIR/GIRK1 current was approximately ten times faster than that of the GIRK1 current. The increase in current amplitude and the qualitative differences imply the formation of functional heteromultimer. The CIR/GIRK1 channel showed differences from the native muscarinic K+ channel in that the basal level before m2 receptor activation is significantly large, and that the activation kinetics are much faster. Using anti- CIR antiserum, the CIR was detected in myocardial cells of the atrium and the ventricular subendocardial layer, and in the cardiac ganglion.[1]References
- Functional characterization and localization of a cardiac-type inwardly rectifying K+ channel. Iizuka, M., Kubo, Y., Tsunenari, I., Pan, C.X., Akiba, I., Kono, T. Recept. Channels (1995) [Pubmed]
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