Characterisation of recombinant AmyA and GlaA
Maximum activities for the recombinant AmyA and GlaA in S. cerevisiae Y294 were observed at pH 4.0 and pH 4.5, respectively, with significant activity detected for both enzymes at pH 3 to 5 (Figure 3). These maxima compared well with those reported for other Aspergillus α-amylase and glucoamylases [3,16,29] and are aligned with the growth conditions of S. cerevisiae, which is desirable for a consolidated process [30]. The temperature maxima (Figure 3) for the recombinant AmyA (60°C) and GlaA (70°C) were slightly higher than the 40 to 60°C generally reported for raw starch degrading α-amylases and glucoamylases