Amino acid dehydrogenase mutant and use thereof

An amino acid dehydrogenase mutant, wherein the amino acid sequence of the mutant is obtained by mutating the amino acid sequence shown in SEQ ID NO:1;

• the mutation comprises one of the following mutation site combinations:
• arginine at the 183rd site is mutated into cysteine, histidine at the 229th site is mutated into serine and phenylalanine at the 148th site is mutated into alanine;
• arginine at the 183rd site is mutated into cysteine, histidine at the 229th site is mutated into serine and tyrosine at the 207th site is mutated into arginine;
• arginine at the 183rd site is mutated into cysteine, histidine at the 229th site is mutated into serine and tyrosine at the 207th site is mutated into glutamic acid;
• arginine at the 183rd site is mutated into alanine, histidine at the 229th site is mutated into serine and threonine at the 173rd site is mutated into histidine;
• arginine at the 183rd site is mutated into valine, histidine at the 229th site is mutated into serine and threonine at the 173rd site is mutated into histidine;
• arginine at the 183rd site is mutated into valine, histidine at the 229th site is mutated into serine and phenylalanine at the 148th site is mutated into alanine;
• threonine at the 173rd site is mutated into histidine, histidine at the 229th site is mutated into serine and phenylalanine at the 148th site is mutated into alanine.