significantly improved variant (S131Y/Q252I) of the natural ϵ-keto ester reductase CpAR2 from Candida parapsilosis for efficiently manufacturing (R)-8-chloro-6-hydroxyoctanoic acid [(R)-ECHO] through co-evolution of activity and thermostability. The activity of the variant CpAR2S131Y/Q252I towards the ϵ-keto ester ethyl 8-chloro-6-oxooctanoate was improved to 214 U mg-1 -from 120 U mg-1 in the case of the wild-type
在这项工作中,我们确定了来自准假丝酵母的天然β-
酮酯还原酶CpAR2的显着改良变体(S131Y / Q252I),可有效生产(R)-8-
氯-
6-羟基辛酸[(R)-
ECHO]通过活性和热稳定性的共同进化。对于野生型酶(CpAR2WT),变体CpAR2S131Y / Q252I对8-
氯-6-氧代
辛酸β-
酮酯的活性从120 U mg-1提高到214 U mg-1--与CpAR2WT相比,半灭活温度(T50,孵育15分钟)同时提高了2.3°C。因此,仅需2 g L-1的冻干大肠杆菌细胞(带有CpAR2S131Y / Q252I)和葡萄糖脱氢酶(GDH),即可达到与我们以前的工作相似的生产率,在优化的反应条件下(530 g L-1 d-1)。该结果证明了生产关键的(R)-
α-硫辛酸中间体8-
氯-6-氧
辛酸乙酯的经济和有效的方法。