为持续进化而设计的细菌直角DNA复制系统
Rongzhen Tian1,2,3,4, Runzhi Zhao1,2,3,4, Haoyu Guo1,2,3,4
1Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China.
Nature chemical biology
|July 14, 2023
概括
科学家们开发了一种细菌直角DNA复制系统 (BacORep),用于持续进化. 这种强大的工具显著增加了细菌的突变率,使得新生物分子的产生和改善细胞功能.
科学领域:
- 合成生物学 合成生物学
- 分子生物学分子生物学
- 微生物进化 微生物进化
背景情况:
- 持续进化的方法对于产生新生物分子和理解进化过程至关重要.
- 现有的直角DNA复制系统 (OrthoRep) 在酵母中有效,但在细菌中不存在.
- 需要一种细菌系统来促进 prokaryotes 中的高通量突变和定向进化.
研究的目的:
- 开发一种新的细菌直角DNA复制系统 (BacORep),用于持续进化.
- 为了设计易发生错误的正对角DNA聚合酶,并为细菌使用适应菌体复制机制.
- 证明BacORep在产生功能性生物分子和增强微生物特征方面的实用性.
主要方法:
- 利用温带菌体GIL16在Bacillus thuringiensis中的复制机制.
- 开发一种易发生错误的工程直角DNA聚合酶.
- 使用直角复制的线性等离子体进行高频突变发生.
- 应用BacORep用于促进体和代谢途径的定向进化.
主要成果:
- 与宿主基因组相比,BacORep实现了6700倍以上的突变率,而不会影响宿主的突变率.
- 所有12种类型的核酸替代被引入到15基基基因中.
- 在Bacillus subtilis和Escherichia coli中产生了功能强大的促进剂.
- 在Bacillus thuringiensis.中实现了甲醇同化增加7.4倍.
结论:
- 巴科雷普是一种强大而有效的工具,用于 prokaryotic 细胞的持续进化.
- 这个系统显著扩大了合成生物学和细菌进化工程的能力.
- 巴科雷普促进了快速生成改进的微生物菌株和新的生物功能.
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