重组大肠杆菌双酶一锅法全细胞合成L-苯乳酸研究
首发时间:2019-01-28
摘要:本研究构建了苯丙氨酸脱氢酶和L-羟基异己酸还原酶的共表达重组大肠杆菌E. coli BL21(DE3, pET28a-pdh-ldh),利用全细胞催化L-苯丙氨酸合成L-苯乳酸,且该反应过程能实现辅酶I NAD+和NADH的自循环。对重组大肠杆菌的诱导条件进行了优化,通过单因素试验和正交试验,最终确定了最佳的诱导条件:OD600=0.6时,添加诱导剂IPTG至终浓度为0.8 mmol/L,在22℃下诱导14.0 h。在最佳的诱导条件下得到的重组大肠杆菌E. coli BL21(DE3, pET28a-pdh-ldh)全细胞催化50.0 mmol/L的L-苯丙氨酸,L-苯乳酸的产物浓度能达到18.2 mmol/L,产率为33.0%,显示了较好的应用前景,也为后续酶的改造奠定了基础。
关键词: L-苯乳酸 苯丙氨酸脱氢酶 L-羟基异己酸还原酶 全细胞转化
For information in English, please click here
Study on One-pot,Two-enzyme biosynthesis of L-phenyllactic by whole cell recombinant E. coli
Abstract:In this study, recombinant Escherichia coli BL21(DE3, pET28a-pdh-ldh) with phenylalanine dehydrogenase and L-isocaproate reductases was constructed.L-phenyllactic acid was synthesized from L-phenylalanine by whole cell.The reaction process can achieve self-circulation of coenzymes I NAD+ and NADH. This experiment also optimized the induction conditions of recombinant E.coli BL21 (DE3, pET28a-pdh-ldh). In the whole cell biosynthesis process using collected recombinant cells as catalyst, at optimal induction conditions(OD600=0.6, IPTG concentration:0.8mmol/L, 22℃and 14.0h), the recombinant E. coli BL21(DE3, pET28a-pdh-ldh) produced 18.2 mmol/L L-PLA with a conversion of33.0% from 50.0 mmol/L L-phenylalanine,which showed a good application prospect and laid the foundation for the subsequent enzyme modification.
Keywords: L-phenyllactic acid Phenylalanine dehydrogenase L-isocaproate reductases whole cell biosynthesis
基金:
引用
No.****
动态公开评议
共计0人参与
勘误表
重组大肠杆菌双酶一锅法全细胞合成L-苯乳酸研究
评论
全部评论0/1000