Provided is a method for efficiently producing from a ketone compound an optically active amino compound useful as an intermediate of a drug, an agricultural chemical, or the like. Provided are: a polypeptide having aminotransferase activity that is increased in stereoselectivity, heat resistance, and resistance to amine compounds compared to the wild type enzyme by means of modifying an aminotransferase derived from
Pseudomonas fluorescens
; a gene encoding the polypeptide; and a transformant that expresses the gene at a high level.
提供了一种从酮化合物高效生产出光学活性
氨基化合物的方法,该
氨基化合物可用作药物、农药等中间体。提供的是:一种具有
氨基转移酶活性的
多肽,通过改性来自Pseudomonas fluorescens的
氨基转移酶,与野生型酶相比,具有立体选择性、耐热性和抗胺化合物性增强;编码该
多肽的
基因;以及在高
水平表达该
基因的转化体。