An improved hydroxynitrile lyase characterized by having a mutation of substitution of at least one amino acid residue in the amino acid sequence of a wild-type hydroxynitrile lyase with another amino acid and by its hydroxynitrile lyase activity per transformant being higher than the hydroxynitrile lyase activity per transformant into which the wild-type hydroxynitrile lyase gene is introduced; and a method for producing a hydroxynitrile lyase, comprising expressing the improved hydroxynitrile lyase in a host and recovering the improved hydroxynitrile lyase from the resultant culture.
一种改进的羟腈裂解酶,其特征在于野生型羟腈裂解酶的
氨基酸序列中至少有一个
氨基酸残基被另一个
氨基酸取代而发生突变,并且其每个转化体的羟腈裂解酶活性高于引入野生型羟腈裂解酶
基因的每个转化体的羟腈裂解酶活性;以及一种生产羟腈裂解酶的方法,包括在宿主中表达改良的羟腈裂解酶,并从产生的培养物中回收改良的羟腈裂解酶。