One mutant acid β- amylase high temperature TBA-H2 and Its Applications

High temperature, or acid β- amylase mutant TBA-H2 and its application, such as the amino acid sequence of SEQ Sequence Listing? ID? NO: 1 shown in the mutant relative to the front of the mutant enzyme has an acidic pH optimum and a higher function of maltose. Mutant temperature β- amylase according to the present invention, TBA-H2 can be used in degrading starch material, particularly suitable for application to degrade starch maltose generated under acidic conditions.