在Corynebacterium glutamicum中进行RAGATH相关DNA核酶辅助DNA插入
Xiaoyu Wang1,2, Siqi Yang1, Fenghui Qian1
1Key Laboratory of Synthetic Biology, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China.
ACS synthetic biology
|May 8, 2025
概括
研究人员使用新的RAGATH相关核酶增强了DNA插入 *Corynebacterium glutamicum*. 这一突破使得更大的DNA片段集成成为可能,进步了这种关键工业微生物的代谢工程和研究应用.
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
- 分子遗传学 分子遗传学
背景情况:
- *Corynebacterium glutamicum*是工业生产料和食品成分的关键微生物宿主.
- 现有的长DNA片段插入技术,如Cas9-RecET,仅限于7.5kb插入.
- 需要先进的基因组编辑工具来扩大*C. glutamicum*的工程能力.
研究的目的:
- 开发一种优化的基因组编辑系统,用于在*C. glutamicum*中插入更大的DNA片段.
- 克服现有的Cas9和Cpf1系统在DNA插入尺寸方面的局限性.
- 识别能够高效大规模DNA整合的新型核酶.
主要方法:
- 系统评估Cas9,gRNA和重组酶表达与17个促进剂/质粒组合.
- 实施和测试用于DNA插入的CPF1系统.
- 对6个较小的RAGATH相关DNA核酶进行选,以检测*C. glutamicum*中的分裂活性.
主要成果:
- 一个优化的基因组编辑载体使使用Cas9.9在*C. glutamicum*中实现了8.0 kb的DNA插入.
- Cpf1系统也实现了8.0kb的插入,但等离子体容量限制了更大的碎片.
- 两个RAGATH相关的DNA核酶表现出卓越的编辑效率,可以整合多达11.3kb的DNA片段.
结论:
- 与RAGATH相关的DNA核酶克服了以前用于长DNA片段插入*C. glutamicum*的尺寸限制.
- 这些新型系统显著提升了代谢工程和基础研究能力.
- 开发的工具扩大了C. glutamicum作为微生物底盘的潜力.
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