基于调节器操纵和媒介优化的结合策略使林科米的生物合成过度生产成为可能
Xinlu Cai1, Wanlian Xu1, Yang Zheng1
1School of Life Sciences, Institute of Physical Science and Information Technology, Anhui University, Hefei, 230601, China.
Synthetic and systems biotechnology
|February 6, 2024
概括
研究人员通过基因改造*Streptomyces lincolnensis**来增强林氏素A (Lin-A) 抗生素的产生. 删除两个关键抑制剂SLCG_4846和SLCG_2919,并优化发酵条件显著提高了Lin-A产量.
科学领域:
- 微生物生物技术 微生物生物技术
- 抗生素生物合成 抗生素生物合成
- 合成生物学 合成生物学
背景情况:
- 抗生素生产至关重要,但通过结合遗传和发酵策略提高产量是具有挑战性的.
- 林氏素A (Lin-A) 是一种林氏素胺类抗生素,由林氏菌 (Streptomyces lincolnensis) 生产.
- 了解控制林-A生物合成的调节机制是提高产量的关键.
研究的目的:
- 为了确定和描述林科米辛生物合成的新型调节剂在林科米辛林科林尼尼斯.
- 通过结合基因工程和发酵优化来增强Lin-A生产.
- 开发一种高性能菌株,以提高抗生素产量.
主要方法:
- 在S. lincolnensis*中,对白敏感调节蛋白 (Lrp) 类调节剂SLCG_4846和抑制剂SLCG_2919的遗传失活化.
- 使用Plackett-Burman设计,最的上升和响应表面的方法来优化种子介质.
- 工程菌株在摇瓶和15L发酵器中发酵.
主要成果:
- 失活SLCG_4846和SLCG_2919单独增加了Lin-A的生产.
- 一种双删除突变 (LA219XΔ4846-2919) 显示出协同效应的产量改善.
- 双重突变菌的优化发酵实现了6.56g/L的最大Lin-A产量,比父菌株增加了55.1%.
结论:
- SLCG_4846和SLCG_2919是林氏素生物合成的关键负调节剂.
- 结合基因改造和发酵优化,显著提高了Lin-A的产量.
- 这一策略有可能开发出用于其他有价值的抗生素的高性能活性菌素.
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