通过路径工程和混合碳源战略优化大肠杆菌中的l-糖生物合成
Zihan Xia1,2, Caiwen Lao3, Jinyong Wu2
1Institutes of Physical Science and Information Technology, Anhui University, Hefei, Anhui 230601, China.
Journal of agricultural and food chemistry
|March 3, 2025
概括
工程化大肠杆菌 (Escherichia coli) 使用优化的酶和混合源发酵,将l-糖的产量提高80%. 这一突破实现了创纪录的产量,为工业规模的l-糖制造铺平了道路.
科学领域:
- 微生物工程 微生物工程
- 代谢工程是代谢工程.
- 生物技术是生物技术.
背景情况:
- 糖是一种有价值的单糖,在制药和婴儿营养中具有应用.
- 目前的生产方法在产量和纯度方面面临挑战,限制了工业的可扩展性.
- 为了高效的l-糖制造,最大限度地减少像2'-糖酸乳糖这样的副产品至关重要.
研究的目的:
- 为了设计一种大肠杆菌菌株,用于高产量的l-糖生产.
- 优化代谢途径和发酵策略,以提高l-糖的合成.
- 为了减少发酵过程中2'-糖乳糖的积累.
主要方法:
- 关键酶 (1,2-fucosyltransferase,α-l-fucosidase) 的基因组整合以指导代谢流动.
- 优化基因拷贝数量,以增加酶的表达.
- 增强瓜诺辛5'-三酸盐供应和辅助因子再生.
- 修改载体蛋白质以最大限度地减少2'-fucosyllactose的积累.
- 使用葡萄糖和甘油作为混合碳来源的共同发酵.
主要成果:
- 在5L生物反应器中实现了91.90g/L的l-糖产量记录.
- 与之前的研究相比,l-糖产量增加了80.01%.
- 获得了1.18gL-1的生产率.
- 成功地将2'-果糖乳糖残留量最小化.
结论:
- 工程设计的E.E. 这种大肠杆菌菌株显示出工业化l-糖生产的巨大潜力.
- 代谢工程策略,包括酶选择和混合源发酵,对于高产生物制造是有效的.
- 这项研究为l-糖生产效率和可扩展性设定了新的基准.
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