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Science 24 April 1987:
Vol. 236. no. 4800, pp. 442 - 445
DOI: 10.1126/science.2436299
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Articles

Science, Vol 236, Issue 4800, 442-445
Copyright © 1987 by American Association for the Advancement of Science

articles

The alpha subunit of the GTP binding protein Gk opens atrial potassium channels

J Codina, A Yatani, D Grenet, AM Brown, and L Birnbaumer

Guanine nucleotide binding (G) proteins (subunit composition alpha beta gamma) dissociate on activation with guanosine triphosphate (GTP) analogs and magnesium to give alpha-guanine nucleotide complexes and free beta gamma subunits. Whether the opening of potassium channels by the recently described Gk in isolated membrane patches from mammalian atrial myocytes was mediated by the alpha k subunit or beta gamma dimer was tested. The alpha k subunit was found to be active, while the beta gamma dimer was inactive in stimulating potassium channel activity. Thus, Gk resembles Gs, the stimulatory regulatory component of adenylyl cyclase, and transducin, the regulatory component of the visual system, in that it regulates its effector function--the activity of the ligand-gated potassium channel--through its guanine nucleotide binding subunit.


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