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Science 21 December 1990:
Vol. 250. no. 4988, pp. 1735 - 1738
DOI: 10.1126/science.2176745
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Articles

Science, Vol 250, Issue 4988, 1735-1738
Copyright © 1990 by American Association for the Advancement of Science

articles

Calcium-sensitive inactivation in the gating of single calcium channels

DT Yue, PH Backx, and JP Imredy

Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205.

Voltage-activated calcium channels open and close, or gate, according to molecular transition rates that are regulated by transmembrane voltage and neurotransmitters. Here evidence for the control of gating by calcium was found in electrophysiological records of single, L-type calcium channels in heart cells. Conditional open probability analysis revealed that calcium entry during the opening of a single channel produces alterations in gating transition rates that evolve over the course of hundreds of milliseconds. Such alteration of calcium-channel gating by entry of a favored permeant ion provides a mechanism for the short-term modulation of single-ion channels.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)