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A zein-degrading protease (ZDP) from Zea mays was heterologously expressed using Pichia pastoris and its characteristics and effects on enzymatic hydrolysis of corn starch were investigated in the current study. The optimal temperature and pH for ZDP activity was 40 °C and pH 5.0, respectively. The ZDP exhibited a degree of thermal stability and was repressed by some metal ions (5 mM) including Zn2+, Mg2+, Cu2+, Mn2+, Ni2+, K+, and Ca2+, especially Mn2+ and Cu2+, which caused near complete inhibition. Dithiothreitol and β-mercaptoethano
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