Figure 8.
Comparative analysis of substrate specificity for four Suc transporters. Substrate-dependent currents were recorded from Xenopus oocytes expressing either A, AtSUC2; B, AtSUC9; C, HvSUT1; or D, ShSUT1 under voltage-clamp conditions. Substrates were applied at concentrations indicated (dictated either by substrate solubility or the Vmax of the transporter) in sodium Ringer solution, pH 5.6. Currents were recorded at a membrane potential of −98 mV. Substrate-dependent currents were normalized to Suc-induced currents for each oocyte. Mean currents for three to six oocytes ± se are presented.