FIGURE 2.

Deactivation kinetics of Kv4 tail current mediated by K⁺ or Rb⁺. Data were analyzed as described in Fig. 1 legend. (A) and (B) Voltage-dependence of the slow (circle) and fast (square) time constants of deactivation from Kv4.1 and Kv4.3 channels. Solid and open symbols are from K⁺ and Rb⁺ currents, respectively. Lines across the symbols are the best-fit exponentials that describe the voltage-dependence of the time constants (Materials and Methods). The partial charges derived from these fits are listed in Table 1. (C) and (D) Voltage-dependence of the corresponding amplitude ratio A_F/A_S derived from the biexponential fits. All symbols are the means from three to seven experiments.