Abstract
NADPH-dependent reactions play important roles in production of industrially valuable compounds. In this study, we used phosphofructokinase (PFK)-deficient strains to direct fructose-6-phosphate to be oxidized through the pentose phosphate pathway (PPP) to increase NADPH generation. pfkA or pfkB single deletion and double-deletion strains were tested for their ability to produce lycopene. Since lycopene biosynthesis requires many NADPH, levels of lycopene were compared in a set of isogenic strains, with the pfkA single deletion strain showing the highest lycopene yield. Using another NADPH-requiring process, a one-step reduction reaction of 2-chloroacrylate to 2-chloropropionic acid by 2-haloacrylate reductase, the pfkA pfkB double-deletion strain showed the highest yield of 2-chloropropionic acid product. The combined effect of glucose-6-phosphate dehydrogenase overexpression or lactate dehydrogenase deletion with PFK deficiency on NADPH bioavailability was also studied. The results indicated that the flux distribution of fructose-6-phosphate between glycolysis and the pentose phosphate pathway determines the amount of NAPDH available for reductive biosynthesis.
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Acknowledgement
This work was supported in part by National Science Foundation CBET0828516. Y. Wang was partially supported by a postdoctoral fellowship from the HHMI Beyond Traditional Borders program and by a John S. Dunn Foundation Collaborative Research Award. The authors want to thank Prof. Kurata for providing plasmid pET101-D-topo-CAA43 and Prof. Benning for the gift of pASK-IBA3-G6PD1.
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Wang, Y., San, KY. & Bennett, G.N. Improvement of NADPH bioavailability in Escherichia coli through the use of phosphofructokinase deficient strains. Appl Microbiol Biotechnol 97, 6883–6893 (2013). https://doi.org/10.1007/s00253-013-4859-0
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DOI: https://doi.org/10.1007/s00253-013-4859-0