Abstract
Guanine nucleotide binding (G) proteins (subunit composition αβγ) dissociate on activation with guanosine triphosphate (GTP) analogs and magnesium to give α-guanine nucleotide complexes and free βγ subunits. Whether the opening of potassium channels by the recently described G k in isolated membrane patches from mammalian atrial myocytes was mediated by the α k subunit or βγ dimer was tested. The α k subunit was found to be active, while the βγ dimer was inactive in stimulating potassium channel activity. Thus, G k resembles G s , 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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Dates
Type | When |
---|---|
Created | 18 years, 10 months ago (Oct. 5, 2006, 4:28 p.m.) |
Deposited | 1 year, 7 months ago (Jan. 12, 2024, 9:47 a.m.) |
Indexed | 1 month, 3 weeks ago (July 2, 2025, 2:46 p.m.) |
Issued | 38 years, 4 months ago (April 24, 1987) |
Published | 38 years, 4 months ago (April 24, 1987) |
Published Print | 38 years, 4 months ago (April 24, 1987) |
@article{Codina_1987, title={The α Subunit of the GTP Binding Protein G k Opens Atrial Potassium Channels}, volume={236}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.2436299}, DOI={10.1126/science.2436299}, number={4800}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Codina, Juan and Yatani, Atsuko and Grenet, Dagoberto and Brown, Arthur M. and Birnbaumer, Lutz}, year={1987}, month=apr, pages={442–445} }