开发一种基于DNA内核酶I-SceI的Cupriavidus necator无痕基因组编辑系统
Suk-Jin Oh1, Gaeun Lim1, Yebin Han1
1Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, Republic of Korea.
Journal of biotechnology
|July 28, 2025
概括
一个新的I-SceI同源重组 (HR) 系统简化了Cupriavidus necator中的基因工程,使得用于聚酸酸盐生产的精确基因编辑成为可能. 这种方法加速了用于合成生物学应用的菌株开发.
科学领域:
- 微生物学 微生物学
- 合成生物学 合成生物学
- 基因工程是一种基因工程.
背景情况:
- 库普里亚维杜斯 (Cupriavidus necator) 是一个关键的微生物,用于二氧化碳固定和聚酸酸盐 (PHA) 生产.
- 现有的基因工程工具,如基于 sacB 的同源重组 (HR) 和 CRISPR-Cas9,在 C. necator. 中存在局限性.
- 在C. necator.中需要精确且无痕迹的基因组编辑工具.
研究的目的:
- 开发和优化一种高效,无痕,精确的DNA内核酶I-SceI介导的同类重组 (HR) 系统,用于C. necator.
- 证明该系统在C. necator.中对基因删除和插入的实用性.
- 使用开发的系统创建一种新的PHA生产菌株.
主要方法:
- 设计了一个基于两个等离子体的I-SceI HR系统,利用特定的起源复制和感应系统.
- 基于结合的基因组集成是使用pOUO-1等离子体实现的,用于第一个HR.
- 使用pOH-4等离子体进行I-SceI表达,诱导第二次HR,在37°C时优化等离子体固化.
主要成果:
- 通过I-SceI HR系统,能够在C. necator.中有效地删除和插入基因.
- 该phaC1基因成功被淘汰,并在同一位置插入phaCBP-M-CPF4.
- 一种新型菌株产生了聚3-基基酸-co-5-基酸.
结论:
- 已建立的I-SceI HR技术显著简化了C. necator.的基因组工程.
- 这种方法将菌株发育所需的时间缩短到几周.
- 该系统促进了C.necator在合成生物学中的更广泛应用.
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