培养Corynebacterium glutamicum和Bacillus licheniformis用于从葡萄糖中生产聚γ-胺酸
Wanjing Liu1,2,3, Jiyue Wang1,2, Luning Gu1,2
1The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China.
Applied microbiology and biotechnology
|December 9, 2025
概括
这项研究开发了一种用于直接从葡萄糖中产生多-γ-胺酸 (γ-PGA) 的新型培系统. 通过Corynebacterium glutamicum-Bacillus licheniformis系统实现了高产量,减少了对昂贵的L-谷氨酸补充剂的依赖.
科学领域:
- 微生物生物技术 微生物生物技术
- 合成生物学 合成生物学
- 生物化学工程 生物化学工程
背景情况:
- 聚-γ-胺酸 (γ-PGA) 是一种多功能生物聚合物,在化品和药物输送中具有应用.
- 目前的γ-PGA生产依赖于微生物发酵,通常使用补充昂贵的L-谷氨酸的Bacillus物种.
- 高的L-Glutamate成本阻碍了工业规模的γ-PGA的生产.
研究的目的:
- 通过使用Corynebacterium glutamicum-Bacillus licheniformis共同培养,从葡萄糖中建立直接的γ-PGA生产方法.
- 为了克服在γ-PGA发酵中补充L-谷氨酸的局限性.
- 为了优化共同培养条件,以实现高效的γ-PGA合成.
主要方法:
- 使用了B. licheniformisATCC 9945a (γ-PGA生产者) 和C. glutamicum F343 (L-谷氨酸酸生产者) 的产物.
- 研究了C. glutamicum超对B. licheniformis γ-PGA生产的影响.
- 采用UPLC-MS进行代谢物分析,以确定参与γ-PGA合成的关键代谢物.
- 优化了培养参数,包括注射时间,注射量比率和总注射量大小.
主要成果:
- C. glutamicum F343成功地从葡萄糖中产生了L-谷氨酸,作为B. licheniformis的前体.
- B. licheniformis 在C. glutamicum超中产生了更多的γ-PGA,而不是外部的L-谷氨酸.
- 确定了9种细胞内代谢物显著影响γ-PGA合成.
- 优化的共同培养系统在摇瓶中达到12.49 g/L γ-PGA,在5L发酵器中达到22.7 g/L.
结论:
- 一个C.Glutamicum-B. 形的共同培养系统可以从葡萄糖中直接,经济高效地生产γ-PGA.
- 与传统方法相比,共同培养策略显著提高了γ-PGA产量.
- 代谢物分析提供了对γ-PGA合成的调节的见解,为进一步的应变工程铺平了道路.
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