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KcsA activity depends on membrane thickness. (a) Time courses of 86Rb+ influx into proteoliposomes containing 70 mol% of PC lipids varying in acyl tail length and 30 mol% POPG reconstituted with E71A KcsA channels (n = 6). Uptake was normalized to valinomycin, which quantifies the maximal uptake possible. (b) Valinomycin normalized counts at 120 swere plotted relative to counts in diC14:1PC/POPG, where maximal activity was observed.
