期刊
METABOLIC ENGINEERING
卷 73, 期 -, 页码 270-279出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ymben.2022.08.003
关键词
L-homoserine; NADH utilization; Redox cofactors; Escherichia coli; Metabolic engineering
资金
- National Key Research and Devel- opment Program of China [2021YFC2100900]
- National Natural Science Foundation of China [32071470]
- Key Research and Development Program of Ningxia Hui Autonomous Region [2019BCH01002]
- Program of Introducing Talents of Discipline to Universities [111-2-06]
In this study, a wild-type Escherichia coli was converted to a high-producer of L-homoserine using metabolic engineer strategies. By regulating the degradation pathway, optimizing copy numbers, and modifying the transport system, a final engineered strain was able to efficiently produce a high level of L-homoserine.
L-Homoserine is a valuable amino acid as a platform chemical in the synthesis of various important compounds. Development of microbial strains for high-level L-homoserine production is an attractive research direction in recent years. Herein, we converted a wild-type Escherichia coli to a non-auxotrophic and plasmid-free hyper-producer of L-homoserine using systematically metabolic engineer strategies. First, an initial strain was obtained through regulating L-homoserine degradation pathway and enhancing synthetic flow. To facilitate L-homoserine production, flux-control genes were tuned by optimizing the copy numbers in chromosome, and transport system was modified to promote L-homoserine efflux. Subsequently, a strategy of cofactors synergistic utilization was proposed and successfully applied to achieve L-homoserine hyperproduction. The final engineered strain could efficiently produce 85.29 g/L L-homoserine, which was the highest production level ever reported from a plasmid-free, antibiotic-free, inducer-free and nonauxotrophic strain. These strategies used here can be consid-ered for developing microbial cell factory of other L-aspartate derivatives.
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