Introduction of the exogenous NADH coenzyme regeneration system and its influence on intracellular metabolic flux of Paenibacillus polymyxa.

Introduction of the exogenous NADH coenzyme regeneration system and its influence on intracellular metabolic flux of Paenibacillus polymyxa.
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外源NADH辅酶再生系统介绍及其对多粘类芽孢杆菌胞内代谢通量的影响。

DOI:
10.1016/j.biortech.2015.11.067
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发表时间:
2016-02
期刊:
Bioresour Technol
影响因子:
--
通讯作者:
Peng, Yingyun
Peng, Yingyun
中科院分区:
其他
文献类型:
--
作者:
Cao, Can;Xue, Feng;Ding, Ge;Peng, Yingyun

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将来自博伊丁假丝酵母的 NAD+ 依赖性甲酸脱氢酶 (FDH) 基因引入多粘类芽孢杆菌 ZJ-9 中。该外源基因对重组菌株P的生长的影响。测定了polymyxaXG-1、FDH活性、细胞内NADH和NAD+水平以及R,R-2,3-丁二醇(R,R-2,3-BD)的合成。 7.5 L生物反应器中的发酵结果表明,外源FDH在重组菌株中得到高表达。重组菌株的NADH、乳酸、乙醇、NADH/NAD+滴度和CO2排泄率(CER)显着增加,而乙偶姻和甲酸显着下降。重组菌株在分批和补料发酵中R,R-2,3-BD的最高滴度分别为36.8 g/L和51.3 g/L,分别比亲本菌株提高了10.2%和8.0%。本研究证实辅酶再生系统可以调控细菌内的物质代谢,是促进NADH依赖性产物合成的有效途径。
The NAD+-dependent formate dehydrogenase (FDH) gene fromCandida boidiniiwas introduced intoPaenibacillus polymyxaZJ-9. The effects of this exogenous gene on the growth of the recombinant strainP. polymyxaXG-1, FDH activity, intracellular NADH and NAD+level and the synthesis ofR,R-2,3-butanediol (R,R-2,3-BD) were determined. Results from the fermentation in the 7.5 L bioreactor showed that the exogenous FDH was highly expressed in the recombinant strain. The titers of NADH, lactic acid, ethanol, NADH/NAD+, and CO2excretion rate (CER) of the recombinant strain increased considerably, while acetoin and formic acid decreased significantly. The highest titers ofR,R-2,3-BD by the recombinant strain in batch and fed-batch fermentation were 36.8 g/L and 51.3 g/L, increased 10.2% and 8.0% compared with the parent strain, respectively. This study confirmed that coenzyme regeneration system can manipulate substance metabolism in bacteria, and is an efficient way for promoting the synthesis of NADH-dependent products.
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