Abstract
The production of valuable chemicals from metabolically engineered microbes can be limited by excretion from the cell. Efflux is often overlooked as a bottleneck in metabolic pathways, despite its impact on alleviating feedback inhibition and product toxicity. In the past, it has been assumed that endogenous efflux pumps and membrane porins can accommodate product efflux rates; however, there are an increasing number of examples wherein overexpressing efflux systems is required to improve metabolite production. In this review, we highlight specific examples from the literature where metabolite export has been studied to identify unknown transporters, increase tolerance to metabolites, and improve the production capabilities of engineered bacteria. The review focuses on the export of a broad spectrum of valuable chemicals including amino acids, sugars, flavins, biofuels, and solvents. The combined set of examples supports the hypothesis that efflux systems can be identified and engineered to confer export capabilities on industrially relevant microbes.
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We thank Jeffrey C. Cameron for reading the manuscript.
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This work was supported by grants from the National Science Foundation (EFRI-1240268, CBET-1149678). NLH is the recipient of a NIH Chemistry-Biology Interface Training Program fellowship (T32 GM008505) and a Graduate Engineering Research Scholars fellowship from the UW-Madison College of Engineering. This article does not contain any studies with human participants or animals performed by any of the authors.
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Jones, C.M., Hernández Lozada, N.J. & Pfleger, B.F. Efflux systems in bacteria and their metabolic engineering applications. Appl Microbiol Biotechnol 99, 9381–9393 (2015). https://doi.org/10.1007/s00253-015-6963-9
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DOI: https://doi.org/10.1007/s00253-015-6963-9