构建用于动态时间调节的级联电路,并将其应用于PHB生产
Xiaomeng Li1,2, Qingsheng Qi1, Quanfeng Liang3
1State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, People's Republic of China.
Biotechnology for biofuels and bioproducts
|October 27, 2023
概括
研究人员开发了一个动态的时间调节级联电路库,使用定数感应系统来控制微生物细胞工厂中的基因表达时间. 这种系统通过提高产品产量来增强代谢工程,其证明是聚β-酸生产增加了1.5倍.
科学领域:
- 合成生物学 合成生物学
- 代谢工程是代谢工程.
- 基因电路设计的基因电路设计
背景情况:
- 动态调节策略对于优化微生物细胞工厂至关重要,通过解决低产量和代谢失衡等问题.
- 控制多个基因表达的精确时间和顺序仍然是代谢工程中的一个重大挑战.
- 定数感应 (QS) 系统和级联调节为精确的代谢途径的时间控制提供了潜在的解决方案.
研究的目的:
- 在大肠杆菌中设计和构建一个自我诱导的动态时间调节级联电路.
- 为代谢应用创建一个具有不同时间间隔的动态时间调节级联电路库.
- 证明开发的级联电路库在增强聚β-基酸 (PHB) 生产方面的有效性.
主要方法:
- 利用定数感应 (QS) 系统和双重调控蛋白级联来设计动态时间基因表达.
- 基于Tra,Las和Lux系统构建了级联电路,实现200分钟和150分钟的时间间隔.
- 通过促进器工程和核糖体结合部位替换开发了一个电路库,产生从110到310分钟的时间间隔.
主要成果:
- 在大肠杆菌中成功设计和建造了自我诱导的动态时间调节级联电路.
- 建立了可调节时间间隔 (110-310分钟) 的级联电路库,用于多功能合成生物学应用.
- 实现了1.5倍增长的聚β-酸 (PHB) 产量,与特定的电路显示卓越的性能.
结论:
- 开发的自我诱导的动态时间调节级联电路库可以实现序列基因表达,平衡细胞生长和产品合成.
- 这种方法有效地解决了两阶段发酵的挑战,并扩大了代谢工程中的动态调节策略的实用性.
- 确定了最佳电路配置,如C2-max菌株,以提高代谢产品产量.
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