整合膜透性工程和酶设计,以有效地生产欧戈氨酸在E. 大肠杆菌
Jiahuan Ling1, Rui Chen1, Minghai Wang1
1School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210046, China.
Journal of agricultural and food chemistry
|June 6, 2025
概括
这项研究利用大肠杆菌 (Escherichia coli) 产生自然抗氧化剂欧戈氨酸 (EGT). 通过提高前体供应和细胞透性,他们实现了EGT产量的8.4倍增长.
科学领域:
- 生物技术是生物技术.
- 代谢工程是代谢工程.
- 抗氧化剂研究 抗氧化剂研究
背景情况:
- 欧戈氨酸 (EGT) 是一种重要的天然抗氧化剂,可以保护细胞免受氧化损伤.
- 增强异质EGT合成具有挑战性,对其从大肠杆菌和野生类型酶功能出口的研究有限.
- 目前的EGT生产方法需要优化,以提高工业可行性.
研究的目的:
- 通过联合代谢和蛋白质工程来改善大肠杆菌 (Escherichia coli) 中的欧戈氨酸 (EGT) 生产.
- 为了研究和增强EGT运输出大肠杆菌细胞.
- 为了优化发酵条件以获得最大的EGT产量.
主要方法:
- 代谢工程以提高EGT合成的前体供应.
- 通过删除脂多糖糖生物合成基因来进行膜透性工程.
- 用*Trichoderma reesei* EGT转运器 (Tregt2) 的蛋白质工程创造了一个突变物 (Tregt2E155C) 具有增强的催化活性.
- 优化酶表达水平和发酵参数.
主要成果:
- 工程菌株MT9-PET-T1/RSF-T2E155C在摇瓶发酵中实现了334.20 ± 6.33 mg/L的EGT (增加了8.4倍).
- 在5升生物反应器中进行扩大,最终EGT标位在96小时内达到4.06g/L (42.29mg/L/h).
- 证明成功操纵大肠杆菌以增强生物分子合成.
结论:
- 综合的代谢,膜和蛋白质工程显著提高了大肠杆菌中的EGT产量.
- 增加膜透性和提高酶催化能力是提高EGT产量的关键.
- 这项研究为工程 *E. coli* 提供了一个有价值的框架,用于合成其他有价值的生物分子.
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