在CRISPR-Cas9中扩大PAM兼容性的设计规则从VQR,VRER和EQR变体中扩展
Francisco Vieyra1, Chinmai Pindi2, George P Lisi3,4
1Department of Inorganic, Analytical & Chemical Physics, University of Buenos Aires, Argentina.
bioRxiv : the preprint server for biology
|September 15, 2025
概括
扩大CRISPR-Cas9基因组编辑需要识别新的原生空间器相邻基因 (PAM). 这项研究揭示了PAM识别涉及局部DNA稳定和远程网络通信,而不仅仅是直接接触,指导未来的Cas9工程.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 基因组学就是基因组学.
背景情况:
- 在基因组编辑方面,CRISPR-Cas9技术至关重要.
- 扩大已知的Protospacer相邻图案 (PAMs) 的范围是更广泛应用的关键.
- 了解Cas9变种中PAM识别的分子机制至关重要.
研究的目的:
- 在三个Cas9变体 (VQR,VRER,EQR) 中剖析PAM识别的原则,以非正典PAM为目标.
- 阐明局部和远端相互作用在稳定Cas9-DNA结合中的作用.
- 为设计具有增强 PAM 兼容性的 Cas9 变体提供一个框架.
主要方法:
- 分子动力学模拟.分子动力学模拟.
- 图形理论和中心性分析.
- 对针对非正规PAM的Cas9变体 (VQR,VRER,EQR) 的分析.
主要成果:
- 有效的PAM识别取决于远程网络稳定PAM绑定域并与REC3.3保持通信.
- D1135V/E替代对于稳定的DNA结合和PAM参与至关重要.
- 只有R-to-Q替换的变体会破坏PAM结合裂的稳定,并破坏全信号传输.
结论:
- PAM识别是一个复杂的过程,涉及到局部稳定,远距离合和入调节,而不仅仅是特定基点的接触.
- 这些发现为设计具有扩展PAM兼容性和改进编辑效率的Cas9变体提供了指导原则.
- 这项研究促进了对精确基因组工程的CRISPR-Cas9机制的理解.
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