Affiliation:
1. grid.454761.5 School of Biological Science and Technology University of Jinan 250022 Jinan People’s Republic of China
Abstract
Abstract
Escherichia coli, a model microorganism for which convenient metabolic engineering tools are available and that grows quickly in cheap media, has been widely used in the production of valuable chemicals, including aromatic amino acids. As the three aromatic amino acids, l-tryptophan, l-tyrosine, and l-phenylalanine, share the same precursors, to increase the titer of a specific aromatic amino acid, the branch pathways to the others are usually permanently inactivated, which leads to the generation of auxotrophic strains. In this study, a tunable switch that can toggle between different states was constructed. Then, a switchable and non-auxotrophic E. coli strain for synthesis of aromatic amino acids was constructed using this tunable switch. By adding different inducers to cultures, three different production patterns of aromatic amino acids by the engineered strain could be observed. This tunable switch can also be applied in regulating other branch pathways and in other bacteria.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province
State Key Laboratory of Microbial Technology Open Projects
Publisher
Oxford University Press (OUP)
Subject
Applied Microbiology and Biotechnology,Biotechnology,Bioengineering
Cited by
4 articles.
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