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Updated: Jul 1, 2025

A Rapid and Facile Pipeline for Generating Genomic Point Mutants in C. elegans Using CRISPR/Cas9 Ribonucleoproteins

A Rapid and Facile Pipeline for Generating Genomic Point Mutants in C. elegans Using CRISPR/Cas9 Ribonucleoproteins

Published on: April 30, 2018

高准确度,超精确度,进化突变物在CRISPR-Cas9中重新连接原子级通信

Erin Skeens¹, Souvik Sinha², Mohd Ahsan²

¹Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI, USA.

Science advances

|March 6, 2024

概括

高特异性的CRISPR-Cas9变体 (HF1,Hypa,Evo) 使用Rec3突变来减少非目标效应. 这些突变改变了Rec3的结构和动态,通过增强与催化HNH域的通信来改善Cas9的特异性.

科学领域:

分子生物学分子生物学
生物化学生化学
结构生物学结构生物学

背景情况:

克里斯普尔-Cas9技术提供了精确的基因编辑,但受到非目标效应的影响.
高保真性 (HF1),超精确性 (Hypa) 和进化 (Evo) Cas9 变种增强了特异性.
识别子域3 (Rec3) 突变在调解这种特异性的作用尚不清楚.

研究的目的:

阐明高特异性Cas9变体中的Rec3突变减轻非目标效应的结构和动态机制.
了解这些突变如何影响Cas9内核酶内的全信号传递.

主要方法:

解决方案核磁共振 (NMR) 光谱学. 解决方案核磁共振 (NMR) 光谱学.
分子动力学 (MD) 模拟.分子动力学 (MD) 模拟.
分析Rec3中的结构和动态变化及其相互作用.

主要成果:

确定了与RNA:DNA杂交物相互作用的Rec3区域的保存结构和动态变化.
证明 Rec3 突变调节了从 Rec3 到 HNH 催化域的全信号传播.
揭示了源自Rec3 α螺旋37的通信通路的重塑,增强了信号传导到活性部位.

结论:

高特异性的Cas9变体中的Rec3突变通过改变蛋白质动态和全信号来增强特异性.
这些发现为Cas9的特异性提供了机制性的见解,并为改进CRISPR工具的未来蛋白质工程策略提供了信息.

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