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  • 标题:Membrane potential dependent binding of scorpion toxin to action potential Na+ ionophore
  • 本地全文:下载
  • 作者:W A Catterall ; R Ray ; C S Morrow
  • 期刊名称:Proceedings of the National Academy of Sciences
  • 印刷版ISSN:0027-8424
  • 电子版ISSN:1091-6490
  • 出版年度:1976
  • 卷号:73
  • 期号:8
  • 页码:2682-2686
  • DOI:10.1073/pnas.73.8.2682
  • 语种:English
  • 出版社:The National Academy of Sciences of the United States of America
  • 摘要:Depolarization of neuroblastoma cells causes a 70-fold increase in the apparent dissociation constant KD for scorpion toxin enhancement of activation of the action potential Na+ ionophore by veratridine and a large increase in the rate of reversal of scorpion toxin action. Depolarization also inhibits binding of 125I-labeled scorpion toxin to a small number of saturable binding sites on electrically excitable neuroblastoma cells and increases the rate of dissociation of scorpion toxin from these sites. The results suggest that scorpion toxin binds to a regulatory component of the action potential Na+ ionophore whose conformation changes on depolarization.
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