A panel of microorganisms was screened for selective reduction ability towards a racemic mixture of prochiral 2-amino-3-methyl-4-ketopentanoate (rac-AMKP). Several of the microorganisms tested produced greater than 0.5 mM 4-hydroxyisoleucine (HIL) from rac-AMKP, and the stereoselectivity of HIL formation was found to depend on the taxonomic category to which the microorganism belonged. The enzymes
筛选一组微
生物对前手性2-
氨基-3-甲基-4-酮
戊酸酯的外消旋混合物的选择性还原能力(rac -A
MKP)。测试的几种微
生物从rac -A
MKP产生大于0.5 mM的
4-羟基
异亮氨酸(HIL),并且发现HIL形成的立体选择性取决于该微
生物所属的分类学类别。负责该A
MKP还原活性的酶,鸭AR和Fs的AR,从两个这些微
生物的鉴定,出芽短梗霉NBRC 4466和茄病镰刀菌分别TG-2,。三种A
MKP还原酶Ap AR,Fs使AR和先前报道的Bt HILDH与rac -A
MKP反应,并且每种酶选择性地产生HIL立体异构体的特定组成。这些酶在识别底物A
MKP的立体结构和控制HIL产品中的
4-羟基构型方面似乎具有不同的特性。