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CRISPR-Cas13d的RNA导向核糖酶活动的结构基础
Cheng Zhang1, Silvana Konermann2, Nicholas J Brideau2
1Laboratory of Genetics, Salk Institute for Biological Studies, 10010 N. Torrey Pines Road, La Jolla, CA 92037, USA; Helmsley Center for Genomic Medicine, Salk Institute for Biological Studies, 10010 N. Torrey Pines Road, La Jolla, CA 92037, USA.
Cell
|September 23, 2018
概括
研究人员阐明了紧的Cas13d酶的结构和功能,这是CRISPR-Cas系统的关键组成部分. 这为先进的转录组工程提供了对RNA指导的洞察力.
科学领域:
- 分子生物学
- 生物化学
- 遗传学
背景情况:
- 克里斯普尔-卡斯系统在原核生物中提供了适应性免疫力,并在基因工程中广泛使用.
- 类型VI-DCRISPR系统具有小的,单效应的Cas13d酶,它们使用导向RNA来准和分裂特定的RNA分子.
研究的目的:
- 了解Cas13d函数及其紧结构的分子基础.
- 提供关于Cas13d的RNA指导,RNA向机制的见解.
- 为设计改进的转录组工程技术奠定基础.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 解析了Cas13d导向RNA二元和Cas13d导向RNA三元复合物的结构.
- 使用冷EM获得了Apo Cas13d的低分辨率重建.
- 使用交换质谱法 (HDX-MS) 来研究结构动力学.
- 进行了生物化学和细胞测试以进行功能性表征.
主要成果:
- Cas13d复合体的高分辨率冷EM结构揭示了分子结构.
- 对Apo Cas13d和HDX-MS数据的6.5 Å重建揭示了与RNA扫描相关的形状动态.
- 这项研究提供了Cas13d对RNA指导RNA向机制的详细见解.
结论:
- 解析的结构和动态信息提供了对Cas13d功能的分子理解.
- 这些发现为新型和增强的转录组工程工具的合理设计奠定了基础.
- 这项研究推进了基因应用的RNA向技术领域.
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