在大肠杆菌中L-lysine的积累中ROS应激的动态调节
Li Zhang1, Jianan Yang1, Zhixuan Lv1
1College of Marine and Bioengineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu Province, China.
Journal of biotechnology
|January 26, 2026
概括
工程化大肠杆菌菌株在L-lysine生产过程中减少了活性氧物种 (ROS). 菌株R3显著降低了ROS,并增加了85.8%的L-lysine产量,提高了细胞活力和生产效率.
科学领域:
- 生物技术是生物技术.
- 代谢工程是代谢工程.
- 微生物发酵 微生物发酵
背景情况:
- 大肠杆菌中反应性氧物种 (ROS) 产生的氧化应激阻碍了细胞活力,并降低了化学制造过程中的产品产量.
- 控制ROS对于优化发酵过程至关重要,特别是在L-lysine等高价值产品中.
研究的目的:
- 设计具有增强抗氧化应激能力的大肠杆菌菌株,以改善L-lysine生产.
- 制定一个动态的ROS调节策略,以减轻压力和提高发酵性能.
主要方法:
- 对大肠杆菌进行基因工程,以创建与父菌株 (R0) 相比,具有不同程度的ROS缓解 (R1,R2,R3) 的菌株.
- 在氧化应激条件下进行了发酵实验,以评估ROS水平和L-lysine生产.
- 在工程菌株和父菌株之间对ROS减少和L-lysine产量的比较分析.
主要成果:
- 在压力条件下,所有工程菌株的ROS水平与父菌株R0相比显著降低.
- 菌株R3表现出最显著的ROS降低.
- 与父菌株R0.0相比,使用R3菌株发酵导致L-氨酸产量增加85.8%.
结论:
- 开发的ROS缓解策略可以精确控制工程细胞工厂中的ROS水平.
- 动态ROS调节有效地提高了细胞活力和氧化应激下L-氨酸合成效率.
- 这种方法提供了一种可行的方法来提高微生物细胞工厂的耐压力和生产率.
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