合成重新设计的Corynebacterium glutamicum通过L-谷氨酸衍生的CoA独立路径生产1,4-butanediol
Jinyoung Kim1, Hyeon Jin Kim2, Sukjae Han2
1School of Chemical and Biological Engineering, Seoul National University, 1 Gwanak-Ro, Gwanak-Gu, Seoul, 08826, South Korea.
Journal of biological engineering
|November 27, 2025
概括
使用Corynebacterium glutamicum开发了一个新的微生物平台,用于从葡萄糖中生产1,4-butanediol (1,4-BDO). 这种工程菌株通过优化生物合成途径并消除产品降解,实现了13,4g/L的1,4-BDO.
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:
- 1,4-butanediol (1,4-BDO) 是一种重要的商品化学品,具有广泛的工业应用.
- 目前的生产方法往往依赖于石化原料,引发了对可持续生物替代品的兴趣.
- 谷氨酸菌 (Corynebacterium glutamicum) 是一个成熟的微生物宿主,用于工业化工生产.
研究的目的:
- 从葡萄糖中设计Corynebacterium glutamicum作为一种微生物平台,用于高效的1,4-BDO生物合成.
- 识别和消除负责宿主菌株中1,4-BDO降解的内源途径.
- 优化发酵策略以最大限度地提高1,4-BDO生产量.
主要方法:
- 在C. glutamicum中构建一个与CoA无关的1,4-BDO生物合成途径.
- 代谢工程策略,包括途径旁路去除和基因删除.
- 转录组分析以确定参与1,4-BDO降解的关键酶 (fadH, aldH, adhA).
- 用于高密度细胞培养和产品积累的料批发发酵.
主要成果:
- 最初的工程菌株产生了2.20g/L的1,4-BDO.
- 确定fadH,aldH和adhA作为关键的1,4-BDO降解酶.
- 这些降解基因的删除提高了标位至3.14 g/L.
- 最终菌株的料批发发酵实现了13.4g/L的产量标位.
结论:
- 可以成功地将Corynebacterium glutamicum设计成一个用于1,4-BDO生物合成的强大平台.
- 消除产品降解途径对于实现高位数至关重要.
- 这项研究在1,4-BDO.生物基生产方面取得了重大进展.
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