修改葡萄糖代谢途径以增强Pseudomonas putida中的多基酸盐合成
Yue Dong1, Keyao Zhai1, Yatao Li1
1College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
Current issues in molecular biology
|November 26, 2024
概括
Pseudomonas putida 的代谢工程增强了中长链多基酸盐 (mcl-PHAs) 的产生. 通过修改葡萄糖代谢,研究人员显著增加了使用葡萄糖作为碳来源的mcl-PHA产量.
科学领域:
- 生物技术是生物技术.
- 代谢工程是代谢工程.
- 聚合物科学 聚合物科学
背景情况:
- 中长链聚酸酸 (mcl-PHAs) 是多功能生物聚合物,在医学和工业中具有应用.
- 使用像葡萄糖这样的低成本碳来源有效生产mcl-PHAs仍然是一个挑战.
- 伪虫是mcl-PHA合成的关键微生物,但它的葡萄糖利用需要改进.
研究的目的:
- 为了增强葡萄糖代谢向乙-CoA,一个前体的mcl-PHA合成在Pseudomonas putida.
- 通过多途径遗传修饰,提高mcl-PHAs的整体合成能力.
- 开发Pseudomonas putida的工程菌株,以增加mcl-PHA的产生.
主要方法:
- Pseudomonas putida 的遗传修饰,包括基因淘汰 (例如, gcd, gltA, hexR) 和促进体替代 (例如, gltB 的 P33).
- 代谢工程策略的重点是将葡萄糖代谢重定向到乙-CoA.
- 使用器瓶中的料介质优化发酵,以评估mcl-PHA产量.
主要成果:
- 淘汰gcd和gltA基因在Pseudomonas putida QSRZ603菌株中的mcl-PHA标位增加了33.7%.
- 与QSRZ603.3相比,在QSRZ607菌株中进一步禁用六基R可使mcl-PHA标位增加62.8%,而在QSRZ603.7菌株中则增加62.8%.
- 改造品种QSRZ609的最终mcl-PHA含量为57.3%重量,标位为2.5g/L,经过优化发酵,产量为59.1%重量和6.8g/L.
结论:
- 多途径基因改造有效地提高了Pseudomonas putida中的葡萄糖利用率和mcl-PHA合成.
- 开发出来的突变物作为进一步增加mcl-PHA生产的有希望的底盘.
- 这项研究为使用葡萄糖作为原料的mcl-PHAs的商业化提供了一个可行的战略.
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