Abstract
Using the patch-clamp technique, we studied the action of charybdotoxin which blocks Ca 2+-activated large-conductance K + channels in animal tissue on the slow-activating (SV), Ca 2+-activated cation channel in the vacuolar membrane of suspension-cells of Chenopodium rubrum L. The toxin reversibly reduced the vacuolar current with EC 50 ≈ 20nM suggesting structural similarities between ion channels in animal and plant membranes.
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