设计一个PhrC-RapC-SinR定数感应分子开关,用于精细调整Bacillus subtilis中menaquinone-7合成的动态微调
Xuli Gao1, Yani Luo1, Elvis Kwame Adinkra1
1College of Biological and Food Engineering, Anhui Polytechnic University, Wuhu, 241000, China.
Microbial cell factories
|April 21, 2025
概括
一种新型的定数感应 (QS) 系统动态调节细菌细菌的代谢途径,显著提高了menaquinone-7 (MK-7) 产量. 这种方法平衡了细胞生长与MK-7合成,使得产量增加了六倍以上.
科学领域:
- 微生物学 微生物学
- 代谢工程是代谢工程.
- 合成生物学 合成生物学
背景情况:
- 重要维生素K2的menaquinone-7 (MK-7) 是由 Bacillus subtilis 生产的,但其产量受到复杂的代谢途径的限制.
- 静态代谢工程方法往往会阻碍细胞生长,因为关键的副产品途径被淘汰.
- 使用定数感应 (QS) 的动态调节提供了一种平衡细胞生长和代谢产生的策略.
研究的目的:
- 开发一个动态的监管系统,以提高Bacillus subtilis的MK-7产量.
- 利用 SinR 转录抑制器和 QS 来微调代谢途径.
- 为了克服微生物代谢物生产中的静态代谢工程的局限性.
主要方法:
- 构建了一个模块化的PhrC-RapC-SinR QS系统,用于动态调节MK-7生物合成.
- 在 Bacillus subtilis 168 (BS168) 中分析和优化了基于 SinR 的基因表达调节.
- 开发了一个促进器库,并进行突变选以改进系统.
主要成果:
- PhrC-RapC-SinR QS系统成功地平衡了细胞生长和MK-7合成.
- 获得了6.27倍的MK-7产量,从13.95 mg/L增加到87.52 mg/L.
- 在MK-7合成中,证明了对关键绕道的动态控制.
结论:
- PhrC-RapC-SinR QS系统有效地整合了生物催化功能,用于动态代谢控制.
- 这种动态的监管方法显示出在各种微生物中具有广泛应用的潜力.
- 通过微调基因表达来增强代谢物生产,可以通过这种QS系统实现.
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