通过增强前体供应以混合途径和辅因子再生来生物生产3-基酸
Tingting Chen1, Yufei Zhang1, Junhua Yun2
1School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China.
ACS synthetic biology
|September 26, 2024
概括
这项研究设计了大肠杆菌以高效地产生3-基酸 (3-HP),这是一个有价值的平台化学物质. 优化的代谢途径和发酵条件实现了42.8g/L的高产量3-HP.
科学领域:
- 代谢工程是代谢工程.
- 工业生物技术 工业生物技术
- 合成生物学 合成生物学
背景情况:
- 3-基酸 (3-HP) 是一种具有广泛工业应用的关键平台化学物质.
- 3-HP生物合成的挑战包括需要坚固的微生物底盘和经济有效的发酵.
- 目前的方法面临产量和生产率的局限性,阻碍了大规模实施.
研究的目的:
- 为了提高3HP生产微生物底盘的强度.
- 通过代谢工程来提高3-HP生物合成的效率和产量.
- 为了优化发酵条件以增加3HP的产量.
主要方法:
- 在大肠杆菌中重新平衡马洛尼尔-CoA (MCA) 途径.
- 调节一个混合途径,整合糖解和非氧化糖解途径,以增强碳流量.
- 微调NADPH再生以获得最佳的代谢活动.
- 优化发酵条件和采用料批量策略.
主要成果:
- 工程Escherichia coli底盘证明了改善了3HP的生产.
- 最初的发酵优化产生了6.8g/L的3-HP.
- 料批发发酵实现了42.8 g/L 3-HP的最终产量,产量为0.4 mol/mol,生产率为0.6 g/L·h.
结论:
- 代谢工程策略,包括途径再平衡和碳流量控制,显著提高了3HP的产量.
- 优化的发酵条件对于最大限度地提高3HP的产量和生产率至关重要.
- 开发的微生物底盘和工艺为工业规模的3-HP生物合成提供了一个有前途的平台.
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