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构建一个工程化Bacillus subtilis用于生产具有特定分子量的聚-γ-胺酸
Yu Lin1, Yiwei Ding2, Lin Shu1,3
1Key Laboratory of Molecular Medical Engineering, Education Department of Guangxi Zhuang Autonomous Region, School of Intelligent Medicine and Biotechnology, Guilin Medical University, Guilin, China.
Frontiers in microbiology
|September 19, 2025
概括
工程 Bacillus subtilis 产生的聚-γ-胺酸 (γ-PGA) 具有受控的分子重量. 这一进步克服了制造更广泛应用的特定γ-PGA类型的局限性.
科学领域:
- 微生物生物技术 微生物生物技术
- 生物聚合物工程 生物聚合物工程
- 合成生物学 合成生物学
背景情况:
- 聚-γ-胺酸 (γ-PGA) 是一种多功能生物聚合物,其应用取决于其分子量 (Mw).
- 目前使用Bacillus物种的生产方法通常需要多个菌株来实现特定的γ-PGA Mws,阻碍了开发.
- 需要一种单一的微生物菌株,能够产生可调节的MW的γ-PGA.
研究的目的:
- 为了设计一种Bacillus subtilis菌株以产生具有动态控制分子重量的γ-PGA.
- 为了克服当前需要多个菌株的 γ-PGA 生产方法的局限性.
主要方法:
- 在 Bacillus subtilis 中删除酶基因 (cwlO,pgdS,ggt).
- 在IPTG可诱导的促进子下引入PgdS表达调节,用于动态MW控制.
- 在5L发酵器中优化发酵,以达到所需的γ-PGA Mw和标位.
主要成果:
- 酶基因的删除显著增加了γ-PGA Mw (220.1%) 和标位 (47.81%).
- 对PgdS表达的动态控制允许产生γ-PGA,Mw范围从9.55×104Da到2.15×107Da.
- 这种工程菌株在5L发酵器中产生了γ-PGA,Mw从8.3×104Da到1.87×107Da.
结论:
- 成功开发了一种能够动态调节 γ-PGA Mw 的工程 Bacillus subtilis 菌株.
- 与以前的研究相比,工程菌株为γ-PGA Mw提供了更广泛的监管范围.
- 这一进步提高了γ-PGA的应用潜力,因为它可以从单一菌株中生产特定的Mws.
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