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- Publisher
- Springer Journals
- Copyright
- Copyright © 1994 by Nature Publishing Group
- Subject
- Science, Humanities and Social Sciences, multidisciplinary; Science, Humanities and Social Sciences, multidisciplinary; Science, multidisciplinary
- ISSN
- 0028-0836
- eISSN
- 1476-4687
- DOI
- 10.1038/368255a0
- Publisher site
- See Article on Publisher Site
Abstract
ACETYLCHOLINE activates inwardly rectifying potassium channels (Ik.ACh) in the heart1 through muscarinic receptor binding and activation of pertussis-toxin-sensitive G proteins2,3. Experiments showing that only the βγ-subunit (Gβγ) activates IK.ACH (ref. 4) were challenged by reports that only the activated α-subunit (Gα) was effective5. Here we examine IK.ACh regulation using purified brain and recombinant G-protein subunits. Six recombinant Gβγ-subunits activated IK.ACh with apparent half-maximal activation concentrations of 3-30 nM. Activation of IK.ACh by recombinant Gα-GTPγS was observed, but this was probably due to release of GTPγS from the protein. Importantly, IK.ACh activity elicited by GTPγS was inhibited by purified brain and recombinant Gα-GDP, suggesting that native Gβγ plays a major role in this pathway. We conclude that Gβγ is a primary regulator of IK.ACh activity.
Journal
Nature – Springer Journals
Published: Mar 17, 1994