Improvement of NADPH bioavailability in Escherichia coli through the use of phosphofructokinase deficient strains
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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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Wang, Yipeng, San, Ka-Yiu and Bennett, George N.. "Improvement of NADPH bioavailability in Escherichia coli through the use of phosphofructokinase deficient strains." Applied Microbiology and Biotechnology, 97, no. 15 (2013) Springer-Verlag: 6883-6893. http://dx.doi.org/10.1007/s00253-013-4859-0.