Fig. 3From: Disulfide bond engineering of AppA phytase for increased thermostability requires co-expression of protein disulfide isomerase in Pichia pastorisApV1 displays indistinguishable optimal temperature and pH activities to AppA phytase. Optimal temperature (a) and pH (b) curves for ApV1 and AppA phytases. Phytase activity was determined by the p-NPP assay at 37 °C. Percentage of maximum activity was calculated as a percentage of phytase activity at the optimal temperature or pH. Data are represented as mean values ± standard deviation (n = 3)Back to article page