对大肠杆菌进行代谢工程,以有效地生产赤丁
Ke Wang1, Xitong Song2,3, Boya Cui1
1The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
Journal of agricultural and food chemistry
|December 26, 2024
概括
大肠杆菌的新陈代谢工程显著提高了ectoine的生产. 基因操纵和途径优化等策略实现了创纪录的35.33g/L的乙产量,为工业应用铺平了道路.
科学领域:
- 生物技术是生物技术.
- 代谢工程是代谢工程.
- 合成生物学 合成生物学
背景情况:
- 乙是一种兼容溶解物,在化品,医药和工业中具有广泛的应用.
- 虽然大肠杆菌是自然由型细菌产生的,但它为工程化乙生物合成提供了一个强大的平台.
- 在大肠杆菌中代谢复杂性和副产品的形成限制了ectoine的产量.
研究的目的:
- 通过系统的代谢工程来增强大肠杆菌BL21(DE3) 中的ectoine生产.
- 调查ectABC基因群,等离子体和关键基因拷贝数对ectoine合成的影响.
- 优化新陈代谢途径,以提高生殖素产量和工业可行性.
主要方法:
- 系统性代谢工程大肠杆菌BL21(DE3) 用于生产ectoine.
- 研究ectABC基因集群,等离子体拷贝数和关键基因拷贝数的影响.
- 实施了基因淘汰,基因过度表达和辅因子工程策略.
主要成果:
- 优化的ectABC序列和高复制量等离子体产生了最高的初始ectoine产量.
- 基因淘汰和阿斯巴酸路径基因 (thrA*,aspA) 的过度表达增加了ectoine产量,达到1.91 g/L.
- 加强酸池和辅助因子平衡导致C24菌株的最终产量为35.33g/L的ectoine.
结论:
- 有针对性的代谢工程显著增强了大肠杆菌中ectoine的生产.
- 菌株C24在高效的葡萄糖转化 (0.21g/g) 的情况下实现了高水平的生殖素生产 (35.33g/L).
- 这项研究为工业规模的生物制造使用工程化大肠杆菌提供了基础.
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