Fig. 5.
pH dependence and voltage dependence of transport activity of OsSUT1 and OsSUT5. (A, B) Sucrose-dependent currents were measured at a membrane potential of −137 mV. The sucrose concentration in Na Ringer solution was 50 mM for OsSUT1 (A) and 25 mM for OsSUT5 (B). (C, D) K0.5 values of sucrose-dependent currents were measured at pH 5.6 and pH 6.8, plotted against the membrane potential. Values for OsSUT1 (C) and OsSUT5 (D) are the mean ± SE from 4–9 oocytes.