创建多倍体Escherichia Coli及其在高效L-氨酸生产中的应用
Sumeng Wang1, Xuanmu Chen1, Xin Jin1
1State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266237, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|September 26, 2023
概括
研究人员为增强生物生产设计了具有多个染色体的多倍体大肠杆菌 (E. coli). 这些多倍体细胞表现出更好的抗压能力,并达到创纪录的L-氨酸产量.
科学领域:
- 合成生物学 合成生物学
- 微生物工程 微生物工程
- 基因组学就是基因组学.
背景情况:
- Prokaryotic 基因组通常是平分体的,限制了它们在合成生物学应用中的潜力.
- 开发高效的微生物底盘对于生物基产品制造至关重要.
- 在 prokaryotes 中的工程多体化提供了一种新的策略来增强细胞功能.
研究的目的:
- 开发一种方法来构建功能多体大肠杆菌.
- 为了研究多化大肠杆菌的生理和遗传特征.
- 评估聚类大肠杆菌在L-threonine生产中的应用.
主要方法:
- 调节ftsZ基因以诱导大肠杆菌中的多体化.
- 通过PCR放大,终端器定位和流细胞计验证多重合体性.
- 转录组分析以确定多倍体细胞中的基因表达变化.
主要成果:
- 成功创建了具有2-4染色体的人工多倍体大肠杆菌.
- 聚类大肠杆菌表现出更大的细胞大小,增强了低pH值耐受性,并增加了乙酸耐药性,而非聚类大肠杆菌相比.
- 在多倍体大肠杆菌中观察到关键功能途径基因的显著上调.
- 在使用工程化多倍体大肠杆菌的食批发发酵中获得了报告中最高的L-氨酸产量 (160.3 g L-1).
结论:
- 建立了一种有效的方法来构建多倍体大肠杆菌.
- 聚类大肠杆菌作为生物化学生产的优越宿主菌株,由高L-氨酸产量证明.
- 这项工作为研究 prokaryotic 进化和染色体功能提供了新的途径.
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