在大肠杆菌 (Escherichia coli) 中进行有氧1,2-二醇生产的并行代谢途径工程
Daisuke Nonaka1, Yuuki Hirata1, Mayumi Kishida1
1Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Nada-ku, Kobe, Hyogo, Japan.
Biotechnology journal
|August 21, 2024
概括
这项研究使用葡萄糖对大肠杆菌进行了空气性1,2-propanediol (1,2-PDO) 生产的工程,而西洛斯支持细胞生长. 这克服了用于可持续的1,2-PDO合成的无氧限制.
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:
- 1,2-二醇 (1,2-PDO) 的微生物生产是一种可持续的替代品,但通常需要无氧条件.
- 在无氧条件下促进细胞生长以获得前体,这对大肠杆菌的1,2-PDO生产构成了重大挑战.
研究的目的:
- 开发一种在大肠杆菌中产生有氧1,2-propanediol (1,2-PDO) 的方法.
- 在有氧条件下,设计一种能够利用葡萄糖用于1,2-PDO合成和糖用于细胞生长的菌株.
主要方法:
- 通过删除参与从葡萄糖中生产1,2-PDO的基因 (gloA, eno, eda, sdaA, sdaB, tdcG) 来设计大肠杆菌菌株.
- 介绍了Weimberg细胞生长的途径,利用西洛斯.
- 过度表达 yagF 并破坏 ghrA 基因以增强 1,2-PDO 生产并最大限度地减少竞争性途径.
主要成果:
- 使用葡萄糖作为生产的唯一碳来源实现了有氧1,2-propanediol (1,2-PDO) 合成.
- 工程菌株PD72在72小时后产生了2.48 ± 0.15 g L-1 的1,2-PDO,产量为0.27 ± 0.02 g g-1 葡萄糖.
- 成功地将1,2-PDO合成途径从有氧生产的三碳酸循环中分离出来.
结论:
- 在工程Escherichia coli中证明了有氧1,2-propanediol (1,2-PDO) 合成的可行性.
- 这种工程菌株有效地利用葡萄糖用于1,2-PDO生产和树脂糖用于生长,克服了以前的限制.
- 这种方法为1,2-PDO的可持续和可扩展的微生物生产提供了一个有希望的战略.
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