对大肠杆菌进行系统工程,以从葡萄糖和乌拉中有效生产伪乌里丁
Chi Zhang1, Guoguang Wei1, Ning Zhou1
1State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, China.
ACS synthetic biology
|March 26, 2024
概括
研究人员开发了一种生物方法,使用工程Escherichia coli从葡萄糖和 uracil 生产伪尿素 (Ψ). 这种高效的生物生产实现了高产量和纯度,为工业规模制造铺平了道路.
科学领域:
- 生物技术是生物技术.
- 合成生物学 合成生物学
- 代谢工程是代谢工程.
背景情况:
- 伪尤里丁 (Ψ) 是一种经过修改的核酸,具有重要的治疗和诊断应用.
- 目前 Ψ 的生产方法往往复杂且昂贵.
- 开发高效和可持续的生物生产路线对于满足需求至关重要.
研究的目的:
- 建立一个有效的in vivo生物生产系统伪尿素 (Ψ).
- 从简单的前体中对大肠杆菌进行高水平的细胞内生产 Ψ 的工程.
- 优化发酵条件,在工业规模上最大限度地提高 Ψ 产量和纯度.
主要方法:
- 对大肠杆菌的宿主菌株和 Ψ 生物合成的关键酶的查.
- 基因工程策略包括优化核糖体结合部位 (RBS) 和增强代谢途径.
- 过度表达特定的基因,包括伪尿素单酸盐 (ΨMP) 糖酶, ΨMP 酸酶和 uracil 载体 UraA.
- 在5L发酵器中进行料批发发酵,以达到高细胞密度和产品积累.
主要成果:
- 工程设计的E.E. 大肠杆菌MG1655过度表达特定酶显示出卓越的 Ψ 生产能力.
- 优化RBS序列和代谢途径显著提高了细胞内 Ψ 度.
- 料批发发酵在48小时内实现了27.5g/L伪尿素的创纪录度.
- 获得了高产量 (89.2mol%向乌拉,25.6mol%向葡萄糖) 和纯度 (99.8%).
结论:
- 这项研究提出了一个高效和环保的生物生产协议,用于伪尿素 (Ψ).
- 工程设计的E.E. coli系统为工业 Ψ 制造提供了一个可扩展和具有成本效益的替代方案.
- 开发的方法有助于在各种应用中大规模提供高纯度的伪尿素.
更多相关视频
10:41The Logic, Experimental Steps, and Potential of Heterologous Natural Product Biosynthesis Featuring the Complex Antibiotic Erythromycin A Produced Through E. coli
Published on: January 13, 2013
18.5K
16:11Protocols for Implementing an Escherichia coli Based TX-TL Cell-Free Expression System for Synthetic Biology
Published on: September 16, 2013
63.9K
相关概念视频
Stringent Response in E. coli
533
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
533
Bioreactor Controls-III
71
Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
71
Production of Pharmaceuticals
100
Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under...
100
