Tracking S4 movement by gating pore currents in the bacterial sodium channel NaChBac.

Measurements of gating pore currents from a holding potential of −80 mV revealed that R1C has only a slight trend toward more negative voltage dependence of G gp (V 1/2 = −160.3 ± 4.5 mV, k = −24.7 ± 3.7 mV for R1C [ n = 10] vs.

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