期刊
BIOTECHNOLOGY JOURNAL
卷 14, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/biot.201800438
关键词
ATPase; ATP wasting; Escherichia coli; metabolic engineering; nitrogen starvation; one-stage fermentation; two-stage fermentation
资金
- Deutsche Forschungsgemeinschaft [LI 1993/2-1] Funding Source: Medline
- ERC Starting Grant [715650] Funding Source: Medline
- H2020 European Research Council [721176, 715650] Funding Source: Medline
- ERC Consolidator Grant StrainBooster [721176] Funding Source: Medline
- European Research Council (ERC) [715650] Funding Source: European Research Council (ERC)
The targeted increase of cellular adenosine triphosphate (ATP) turnover (enforced ATP wasting) has recently been recognized as a promising tool for metabolic engineering when product synthesis is coupled with net ATP formation. The goal of the present study is to further examine and to further develop the concept of enforced ATP wasting and to broaden its scope for potential applications. In particular, considering the fermentation products synthesized by Escherichia coli under anaerobic conditions as a proxy for target chemical(s), i) a new genetic module for dynamic and gradual induction of the F-1-part of the ATPase is developed and it is found that ii) induction of the ATPase leads to higher metabolic activity and increased product formation in E. coli under anaerobic conditions, and that iii) ATP wasting significantly increases substrate uptake and productivity of growth-arrested cells, which is vital for its use in two-stage processes. To the best of the authors' knowledge, the glucose uptake rate of 6.49 mmol gCDW(-1) h(-1) achieved with enforced ATP wasting is the highest value reported for nongrowing E. coli cells. In summary, this study shows that enforced ATP wasting can be used to improve yield and titer (in growth-coupled processes) as well as volumetric productivity (in two-stage processes) depending on which of the performance measures is more crucial for the process and product of interest.
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