Figure 6.

Substrate specificity of AtSUC9. Substrate-dependent currents were recorded from Xenopus oocytes expressing AtSUC9 under voltage-clamp conditions. Substrates were applied at 2.5-mm concentrations in sodium Ringer solution, pH 5.0. Currents were recorded at a membrane potential of −137 mV. Substrate-dependent currents were normalized for each oocyte to currents recorded with 2.5 mm Suc to control for differences in AtSUC9 expression between oocytes. The average Suc-induced current under these conditions was 55 nA. Mean currents for three oocytes ± se are presented. pnp, Paranitrophenyl.