相关实验视频

Updated: Jul 4, 2025

DNAzyme-dependent Analysis of rRNA 2’-O-Methylation

DNAzyme-dependent Analysis of rRNA 2’-O-Methylation

Published on: September 16, 2019

水解内核解酶 (HYER) 可编程用于特定序列的DNA裂变

Zi-Xian Liu¹, Shouyue Zhang¹, Han-Zhou Zhu¹

¹Beijing Advanced Innovation Center for Structural Biology, State Key Laboratory of Membrane Biology, Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing 100084, China.

Science (New York, N.Y.)

|February 1, 2024

概括

研究人员发现了HYERs,一种可以切割DNA的催化RNA. 这些天然的 ribozymes 显示出精确的 DNA 操纵和基因组编辑应用的潜力.

科学领域:

分子生物学
生物化学
遗传学

背景情况:

ribozymes 是催化性RNA分子,在细胞过程中起着重要的作用.
自然的 ribozymes 越来越多地被认为具有超越 RNA 催化,包括 DNA 操纵的潜力.

研究的目的:

识别和描述作为序列特异性DNA内核酶的自然 ribozymes.
探索这些 ribozymes 作为新型的 DNA 操纵工具.

主要方法:

研究人员专注于细菌II-C组内蛋白, 选缺乏内蛋白编码的系统.
在体外测试中测试了已识别的核酶 (HYER) 与各种核酸基质的分裂活性.
使用冷电子显微镜确定HYER1的DNA结合和催化机制的结构基础.
应用了合理的设计策略来设计具有增强特异性和功能的HYER变体.

主要成果:

鉴定出了几种称为HYER的内离子系统,可以分裂RNA,单链DNA和双链DNA.
在实验室中,HYER1显示能够诱导哺乳动物基因组中的dDNA断裂.
低温电子显微镜显示HYER1具有Mg2+依赖的水解口袋和DNA结合的能力.
改造的HYER变种表现出更好的DNA操纵特异性和灵活性.

结论:

自然的核酶,特别是来自II-C组内核的HYER,具有DNA内核酶活性.
这些HYER可以被设计为精确的DNA分裂,为基因组编辑和生物技术提供了一个有前途的新平台.

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Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro

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