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Science 23 September 1988:
Vol. 241. no. 4873, pp. 1658 - 1661
DOI: 10.1126/science.2458625
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Articles

Science, Vol 241, Issue 4873, 1658-1661
Copyright © 1988 by American Association for the Advancement of Science

articles

Identification of an intracellular peptide segment involved in sodium channel inactivation

PM Vassilev, T Scheuer, and WA Catterall

Department of Pharmacology, University of Washington, School of Medicine, Seattle 98195.

Antibodies directed against a conserved intracellular segment of the sodium channel alpha subunit slow the inactivation of sodium channels in rat muscle cells. Of four site-directed antibodies tested, only antibodies against the short intracellular segment between homologous transmembrane domains III and IV slowed inactivation, and their effects were blocked by the corresponding peptide antigen. No effects on the voltage dependence of sodium channel activation or of steady-state inactivation were observed, but the rate of onset of the antibody effect and the extent of slowing of inactivation were voltage-dependent. Antibody binding was more rapid at negative potentials, at which sodium channels are not inactivated; antibody-induced slowing of inactivation was greater during depolarizations to more positive membrane potentials. The peptide segment recognized by this antibody appears to participate directly in rapid sodium channel inactivation during large depolarizations and to undergo a conformational change that reduces its accessibility to antibodies as the channel inactivates.


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