To provide a method for preparing optically active compounds, which mainly contain (R)-amino compounds, by microbial enzymes efficiently and inexpensively; a polypeptide having stereoselective transaminase activity which can be suitably used for the above preparation method; and a DNA encoding the polypeptide. A method for preparing an optically active amino compound, characterized in stereoselectively transaminating by acting a transaminase on an amino group acceptor, a ketone compound in the presence of an amino group donor, a primary amine; a DNA comprising a nucleotide sequence encoding a polypeptide having stereoselective transaminase activity; and a polypeptide having stereoselective transaminase activity obtainable from a culture of a microorganism belonging to the genus Arthrobacter.
提供一种通过微
生物酶高效、低成本地制备主要含有(R)-
氨基化合物的手段;一种具有立体选择性转
氨酶活性的
多肽,适用于上述制备方法;以及编码该
多肽的DNA。一种制备光学活性
氨基化合物的方法,其特征在于,在存在
氨基供体——一种初级胺的情况下,通过作用转
氨酶对
氨基受体进行立体选择性转
氨,将酮化合物转化为目标化合物;一种包含编码具有立体选择性转
氨酶活性的
多肽的核苷酸序列的DNA;以及从属于芽孢杆菌属的微
生物培养物中获得的具有立体选择性转
氨酶活性的
多肽。