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. 1976 Aug;73(8):2682–2686. doi: 10.1073/pnas.73.8.2682

Membrane potential dependent binding of scorpion toxin to action potential Na+ ionophore.

W A Catterall, R Ray, C S Morrow
PMCID: PMC430712  PMID: 1066680

Abstract

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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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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