为了高效的2,3-butanediol生产,Enterobacter气原体的系统代谢工程
Ping Lu1, Ruoxuan Bai1, Ting Gao1
1Zhejiang Province Key Laboratory of Plant Secondary Metabolism and Regulation, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, 310018, China.
Applied microbiology and biotechnology
|January 19, 2024
概括
对Enterobacter aerogenes的代谢工程增强了2,3-Butanediol (2,3-BDO) 的微生物生产. 战略提高了90%,产量达到0.49g/g,为石化提供了可持续的替代品.
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:
- 2,3-二醇 (2,3-BDO) 的微生物生产是石油化学合成的可持续替代品.
- 目前对微生物2,3-BDO的标位,产量和生产率都不够理想.
- "空气性肠杆菌" (Enterobacter aerogenes) 是生产2,3-BDO的关键微生物.
研究的目的:
- 通过系统代谢工程来增强Enterobacter空气原体中的2,3-BDO生产.
- 为了克服工业应用的标题,产量和生产率的局限性.
- 为2,3-BDO合成开发一个更有效,更可持续的微生物平台.
主要方法:
- 通过删除负责副产品合成的基因来重建pyruvate代谢网络.
- 响应调节器DR1558的异质表达,以增加细胞抗压力.
- 优化碳来源,包括糖和葡萄糖,以提高产品产量.
- 在5L发酵器中进行发酵研究,以评估规模化的生产.
主要成果:
- 删除五个关键基因通过重定向代谢流量,使2,3-BDO标位增加了90%.
- 通过增强的应力耐受性,DR1558的表达使2,3-BDO的生产率提高了55%.
- 作为碳来源的糖与葡萄糖相比,产生的2,3-BDO标位高出20%,达到0.49g/g.
- 在5L发酵器中最终的2,3-BDO标位达到22.93g/L,比野生型菌株提高了85%,副产品最小.
结论:
- 系统代谢工程有效地消除了Enterobacter aerogenes中的2,3-BDO生产的瓶.
- 工程菌株IAM1183-LPCT/D在标位,产量和生产率方面取得了显著的改进.
- 这项研究提供了一个有希望的微生物平台,用于可持续和高效地生产2,3-BDO.
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