在大肠杆菌中使用乙酸盐作为唯一的碳来源合成异芽醇
Pengfei Gu1, Shuo Zhao2, Hao Niu2
1School of Biological Science and Technology, University of Jinan, Jinan, 250022, People's Republic of China. bio_gupf@ujn.edu.cn.
Microbial cell factories
|September 27, 2023
概括
这项研究使大肠杆菌从非食品碳来源的酸盐中产生异布他. 优化实现了创纪录的157.05毫克/升的异本醇标位,推动了可持续生物燃料生产.
科学领域:
- 代谢工程是代谢工程.
- 合成生物学 合成生物学
- 微生物生物技术 微生物生物技术
背景情况:
- 对化石燃料耗尽和环境污染的日益担忧推动了对可持续生物燃料合成的研究.
- 微生物生产的生物燃料,如异芽醇提供了一个有希望的替代化石燃料.
- 乙是一种具有成本效益的非食品基质,适合微生物转化为有价值的化学物质.
研究的目的:
- 用乙酸盐作为唯一的碳源来设计一种大肠杆菌 (E. coli) 菌株,用于微生物生产异芽醇.
- 通过优化代谢途径和发酵条件来增强异芽醇生产.
主要方法:
- 使用乙酸在大肠杆菌中构建异芽醇合成途径.
- 通过乙-CoA通过pyruvate-ferredoxin氧化还原酶 (YdbK) 或性通路进行工程性pyruvate生成.
- 过度表达转酶和NAD激酶以改善辅因子平衡.
主要成果:
- 在大肠杆菌中成功构建了异芽醇合成途径,其中乙酸作为唯一的碳来源.
- 由于关键酶的过度表达,异芽醇标位从121.21 mg/L增加到131.5 mg/L.
- 通过优化 WY002 菌株中乙酸盐补充剂,达到最高的异布他标位 157.05 mg/L.
结论:
- 在微生物异芽醇生产中使用乙酸盐减少了对食品基质的依赖,降低了生产成本.
- 应用的代谢工程策略为从酸盐中生产酸盐衍生化学品提供了有价值的框架.
- 这项研究有助于开发可持续和具有成本效益的生物燃料生产方法.
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