一种广泛的CRISPR-Cas9抑制剂
Lucas B Harrington1, Kevin W Doxzen2, Enbo Ma1
1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
Cell
|August 29, 2017
概括
两种抗CRISPR蛋白 (Acrs) 通过不同的机制抑制Cas9基因组编辑. 在很大程度上,AcrIIC1阻断了DNA切割,而AcrIIC3则阻止了目标结合,从而对Cas9活动进行了精确的控制.
科学领域:
- 分子生物学
- 遗传学
- 生物化学
背景情况:
- CRISPR-Cas9是一种来自细菌免疫系统的强大基因组编辑工具.
- 来自菌体的抗CRISPR蛋白 (Acrs) 可以抑制Cas9的活性.
- 了解ACR机制对于完善CAS9应用至关重要.
研究的目的:
- 阐明两种抗CRISPR蛋白AcrIIC1和AcrIIC3的独特抑制机制.
- 研究这些Acrs如何与Cas9相互作用以调节其基因组编辑功能.
- 探索Acrs在控制Cas9活动中的潜在应用.
主要方法:
- 生物化学测定以评估AcrIIC1和AcrIIC3对Cas9的抑制
- 结构生物学 (晶体学) 用于确定具有Cas9 HNH域的AcrIIC1复杂结构.
- 在AcrIIC3的存在下分析Cas9二元化和DNA结合.
主要成果:
- 通过与HNH催化域结合,AcrIIC1广泛地抑制了各种Cas9正态,将Cas9困在DNA结合的非活性状态中.
- 通过诱导二元化和防止向DNA结合,AcrIIC3 特别抑制一个Cas9正基因.
- 晶体结构揭示了AcrIIC1抑制Cas9的催化活性的机制.
结论:
- AcrIIC1和AcrIIC3使用正交策略来抑制Cas9.
- 这些独特的机制可以精确控制Cas9的DNA结合和分裂功能.
- 这些发现表明Acrs在先进的基因组编辑技术中的新应用.
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