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Improving lycopene production in Escherichia coli by engineering metabolic control

Nature Biotechnology 18, 533–537 (2000) | Download Citation

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Abstract

Metabolic engineering has achieved encouraging success in producing foreign metabolites in a variety of hosts. However, common strategies for engineering metabolic pathways focus on amplifying the desired enzymes and deregulating cellular controls. As a result, uncontrolled or deregulated metabolic pathways lead to metabolic imbalance and suboptimal productivity. Here we have demonstrated the second stage of metabolic engineering effort by designing and engineering a regulatory circuit to control gene expression in response to intracellular metabolic states. Specifically, we recruited and altered one of the global regulatory systems in Escherichia coli, the Ntr regulon, to control the engineered lycopene biosynthesis pathway. The artificially engineered regulon, stimulated by excess glycolytic flux through sensing of an intracellular metabolite, acetyl phosphate, controls the expression of two key enzymes in lycopene synthesis in response to flux dynamics. This intracellular control loop significantly enhanced lycopene production while reducing the negative impact caused by metabolic imbalance. Although we demonstrated this strategy for metabolite production, it can be extended into other fields where gene expression must be closely controlled by intracellular physiology, such as gene therapy.

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Acknowledgements

The authors gratefully acknowledge Chia-wei Wang of our laboratory for the construction of pCW9. This work was supported by the National Science Foundation (grant BES-9814097) and the US Department of Energy (DE-FG03-95ER20205).

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  1. Department of Chemical Engineering, University of California Los Angeles, Los Angeles, CA 90034.

    • William R. Farmer
    •  & James C. Liao

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Correspondence to James C. Liao.

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https://doi.org/10.1038/75398