coli (HADH-LlKAR-GDH) co-expressing 2-hydroxyacid dehydrogenase, LlKAR, and glucose dehydrogenase was constructed for efficient deracemization of racemic 2-HAs. Most of the racemic 2-HAs were deracemized to their (R)-isomers at high yields and enantiomeric purity. In the case of racemic 2-chloromandelic acid, as much as 300 mM of substrate was completely transformed into the optically pure (R)-2-chloromandelic
对映纯2-羟基酸(2-HAs)是合成药物和
精细化学品的重要中间体。外消旋2-HA脱
硫成相应的单个对映体代表了一种工业上合成手性2-HA的经济高效的方法。在这项工作中,通过
基因组挖掘发现了一种来自
乳酸乳球菌(LlKAR)的新的
酮酸还原酶,该酶具有更高的活性和对芳香族α-
酮酸的底物耐受性,然后对其酶学性质进行了表征。因此,构建了共表达2-羟酸脱氢酶,LlKAR和葡萄糖脱氢酶的工程化大肠杆菌(HADH-L1KAR-GDH),以有效地消旋外消旋2-HA。大部分外消旋2-HA均以高收率和对映体纯度脱
硫为它们的(R)异构体。