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Multi-modular engineering of 1,3-propanediol biosynthesis system in Klebsiella pneumoniae from co-substrate.
Applied Microbiology and Biotechnology 2017 January
1,3-Propanediol (1,3-PDO) is a monomer for the synthesis of various polyesters. It is widely used in industries including cosmetics, solvents, and lubricants. Here, the multi-modular engineering was used to improve the concentration and tolerance of 1,3-PDO in Klebsiella pneumoniae. Firstly, the concentration of 1,3-PDO was increased by 25 %, while the concentrations of by-products were reduced considerably through one-step evolution which focused on the glycerol pathway. In addition, the 1,3-PDO tolerance was improved to 150 g L(-1). Secondly, co-substrate transport system was regulated, and the 1,3-PDO concentration, yield, and productivity of the mutant were improved to 76.4 g L(-1), 0.53 mol mol(-1), and 2.55 g L(-1) h(-1), respectively. Finally, NADH regeneration was introduced and the recombinant strain was successfully achieved with a high productivity of 2.69 g L(-1) h(-1). The concentration and yield of 1,3-PDO were also improved to 86 g L(-1) and 0.59 mol mol(-1). This strategy described here provides an approach of achieving a superior strain which is able to produce 1,3-PDO with high productivity and yield.
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