Publication Date:
1993-10-22
Description:
The voltage-activated rabbit cardiac calcium channel alpha 1 subunit was expressed in Xenopus oocytes. The charge movement of its voltage sensor was measured and related to the opening of the ion-conducting pore. The half-activation potential for charge movement was 35 millivolts more negative than that for pore opening. Coexpression of the cardiac calcium channel beta subunit reduced this difference without affecting charge movement. Thus, intramolecular coupling between the voltage sensor and the channel pore opening can be facilitated by a regulatory subunit.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Neely, A -- Wei, X -- Olcese, R -- Birnbaumer, L -- Stefani, E -- AR38970/AR/NIAMS NIH HHS/ -- HL37044/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1993 Oct 22;262(5133):575-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX 77030.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8211185" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
Barium/metabolism
;
Calcium Channels/*metabolism
;
Electric Conductivity
;
*Ion Channel Gating
;
Membrane Potentials
;
Myocardium/*metabolism
;
Oocytes/metabolism
;
Rabbits
;
Xenopus
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
