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A thermostable α‐amylase gene (AmySN) from Geobacillus stearothermophilus DMSZ 456 with an open reading frame of 1446 bp, encoding 481 amino acids is cloned. The optimal pH and temperature of AmySN are 6.0 and 75 °C. Through site‐directed mutation, the optimum temperature of the mutant AmyS2 (A27C‐A90C) is increased from 75 to 80 °C and shows enhanced T1/2 of 104.9 min at 90 °C in comparison to the...