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双抗生素免费的等离子体系统使高效的l-糖生物合成成为可能
Jiawei Meng1, Yingying Zhu1, Zhen Lu2
1State Key Laboratory of Food Science and Resources, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China.
ACS synthetic biology
|March 28, 2025
概括
这项研究开发了一种无抗生素的方法,用于使用工程化大肠杆菌生产l-糖. 这种新的策略确保了基因稳定性,为这种有价值的功能性单糖化物实现了创纪录的产量.
科学领域:
- 生物技术是生物技术.
- 代谢工程是代谢工程.
- 微生物生产 微生物生产
背景情况:
- 糖是一种有价值的单糖,在药品,营养食品和化品中具有应用.
- 传统的微生物生产方法依赖于依赖抗生素的系统,这引发了环境和监管方面的担忧.
- 实现高效率和稳定的微生物生产l-糖仍然是一个挑战.
研究的目的:
- 开发一种双抗生素免费的等离子体策略,用于工程化大肠杆菌中高效的l-糖生物合成.
- 增强基因稳定性和等离子体保留,而无需选择抗生素.
- 为了优化新陈代谢途径以增加l-糖产量.
主要方法:
- 工程造型大肠杆菌 (Escherichia coli) BL21(DE3) 具有双抗生素免费等离子体系统.
- 整合了毒素-抗毒素系统和基于cysC的辅助性选择.
- 代谢途径的优化,包括促进物替代,关键酶的基因组整合,以及阻断l-fucose降解.
主要成果:
- 在没有抗生素的系统中实现了强大的l-糖生产.
- 在摇瓶发酵中生产了7.99g/L的l-糖.
- 通过食批量种植达到61.91 g/L的纪录标位.
结论:
- 结合的毒素-抗毒素和辅助性选择策略确保了基因稳定性和高水平的l-fucose生产,无需使用抗生素.
- 这种方法代表了功能单糖的可持续和高生产率微生物制造的重大进步.
- 开发的菌株和方法为工业规模的l-糖生物合成提供了一个有前途的平台.
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