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Biophysical Journal 30: 199-204 (1980)
© 1980 the Biophysical Society

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A model for the effects of potential and external K+ concentration on the Cs+ blocking of inward rectification.

S Ciani, S Krasne and S Hagiwara

ABSTRACT

Inward rectification in starfish egg cell membranes is blocked by external Cs+, the degree of blocking being an increasing function of hyperpolarizing potentials and of the external concentration of K+. While the effect of K+ and the particular functional dependence of blocking on potential are difficult to reconcile with a one-ion pore model, both features can be accounted for assuming that the pore has at least two sites and tat a considerable fraction of the blocked pores is simultaneously occupied by a Cs+ ion in the inner site and by a K+ in the outer one.




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