在P.中Rhamnolipid的过度产量 通过蛋白质和代谢工程的putida
Ai-Ping Pang1,2, Shan-Shan Peng1,2, Xiang-Yang Li1,2
1National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou 310014, People's Republic of China.
Journal of agricultural and food chemistry
|October 13, 2025
概括
工程化Pseudomonas putida可以有效地产生rhamnolipids,环保的生物表面活性剂. 这项研究改善了关键酶RhlA和优化代谢途径,在生物安全菌株中实现了创纪录的产量.
科学领域:
- 生物技术和合成生物学
- 为可持续生产提供微生物工程.
背景情况:
- 拉姆诺脂是有价值的环保生物表面活性剂,具有多种应用.
- 本地生产者Pseudomonas aeruginosa是一种机会性病原体,需要更安全的替代品.
- 伪虫是一种生物安全菌株,使其成为微生物生产的理想宿主.
研究的目的:
- 为了改造生物安全菌株Pseudomonas putida,以提高脂蛋白的产量.
- 通过理性和计算设计,提高关键酶RhlA的催化活性.
- 优化代谢途径,以增加前体的可用性和整体脂产量.
主要方法:
- 理性和计算机辅助的设计来设计RhlA酶,导致RhlAF43W/G130N具有增强的活性.
- 分子动力学模拟以阐明RhlA改进的机制.
- 代谢工程策略包括关键基因 (rhlAF43W/G130N,rhlB) 的过度表达和rmlBDAC操作子在Δflag菌株中的异质表达.
主要成果:
- 改造的RhlAF43W/G130N酶显著增强了催化活性.
- 最后的工程菌株E3在摇瓶培养中达到5.1g/L的拉姆诺脂酸标位.
- 在5L生物反应器中,E3菌株产生了28.6g/L的脂蛋白,生产率为0.3g/L/h,代表了工程P. putida KT2440.0的最高报告标位.
结论:
- 工程 Pseudomonas putida 是一个可行的策略,用于安全和高效的脂蛋白生产.
- 结合酶工程和代谢途径优化,显著提高了拉姆诺脂类产量.
- 开发的E3菌株显示了工业规模可持续生物表面活性剂制造的巨大潜力.
相关概念视频
Stringent Response in E. coli
296
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...
296
Lipid Catabolism
850
Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
850


