通过优化发酵策略,对大肠杆菌进行代谢工程,以通过优化发酵策略产生高产量的多巴胺
Xu Li1,2, Yanghao Liu1,2, Ling Ma1,2
1College of Biotechnology, Tianjin University of Science and Technology, Tianjin, China.
Applied and environmental microbiology
|May 8, 2025
概括
研究人员设计了一种高产多巴胺产生的大肠杆菌菌株,通过代谢工程和优化发酵实现了创纪录的22.58g/L产量. 这一突破支持工业规模的多巴胺生产.
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:
- 多巴胺 (DA) 生物合成受到代谢调节和发酵策略的限制.
- 开发高效的微生物生产方法来生产像DA这样的高价值化合物至关重要.
研究的目的:
- 构建一种无等离子体,无缺陷的大肠杆菌菌株,用于高产量的多巴胺生产.
- 优化发酵策略,以提高多巴胺产量和稳定性.
主要方法:
- 通过表达DmDdC和 hpaBC基因,在大肠杆菌中构建了一个多巴胺生物合成模块.
- 采用代谢工程来增加碳流量,基因拷贝数和辅因子供应.
- 开发了一种两阶段的pH发酵策略和Fe2+-ascorbic酸养策略.
主要成果:
- 在大肠杆菌中实现了初步的多巴胺合成.
- 通过促进剂优化和代谢增强,设计了一种高产品种DA-29.
- 在5L生物反应器中获得了22.58g/L的多巴胺产量记录.
结论:
- 开发的大肠杆菌菌株DA-29表现出高的多巴胺生产能力.
- 优化的发酵策略显著提高了多巴胺产量,并最大限度地降低了降解.
- 这项研究为工业规模的多巴胺生产提供了坚实的基础,并促进了微生物对芳香氨基酸衍生物的生产.
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