当前位置: X-MOL 学术Science › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A Cas9-guide RNA complex preorganized for target DNA recognition
Science ( IF 44.7 ) Pub Date : 2015-06-25 , DOI: 10.1126/science.aab1452
Fuguo Jiang 1 , Kaihong Zhou 2 , Linlin Ma 2 , Saskia Gressel 3 , Jennifer A Doudna 4
Affiliation  

An RNA seed poised to meet its target The CRISPR-Cas system in prokaryotes precisely identifies infecting parasitic DNAs and viruses and destroys them. The CRISPR-Cas system has been adapted for facile genome editing, heralding a new age in molecular biology. Jiang et al. show that the Cas9 nuclease adopts a distinct confirmation when it binds to the targeting guide RNA. The guide RNA then assumes a preordered shape. This RNA “seed region” is thus poised to initiate recognition of the DNA target sequence. Science, this issue p. 1477 The guide RNA in the CRISPR-Cas immune/editing system is poised to initiate recognition of target DNA. Bacterial adaptive immunity uses CRISPR (clustered regularly interspaced short palindromic repeats)–associated (Cas) proteins together with CRISPR transcripts for foreign DNA degradation. In type II CRISPR-Cas systems, activation of Cas9 endonuclease for DNA recognition upon guide RNA binding occurs by an unknown mechanism. Crystal structures of Cas9 bound to single-guide RNA reveal a conformation distinct from both the apo and DNA-bound states, in which the 10-nucleotide RNA “seed” sequence required for initial DNA interrogation is preordered in an A-form conformation. This segment of the guide RNA is essential for Cas9 to form a DNA recognition–competent structure that is poised to engage double-stranded DNA target sequences. We construe this as convergent evolution of a “seed” mechanism reminiscent of that used by Argonaute proteins during RNA interference in eukaryotes.

中文翻译:


预先组织用于目标 DNA 识别的 Cas9 引导 RNA 复合物



RNA 种子准备实现其目标原核生物中的 CRISPR-Cas 系统精确识别感染性寄生 DNA 和病毒并消灭它们。 CRISPR-Cas 系统已适应轻松的基因组编辑,预示着分子生物学的新时代。江等人。表明 Cas9 核酸酶在与靶向指导 RNA 结合时采用了独特的确认。然后引导 RNA 呈现预定的形状。因此,这个 RNA“种子区域”准备启动对 DNA 靶序列的识别。科学,本期第 14 页。 1477 CRISPR-Cas 免疫/编辑系统中的向导 RNA 准备启动对目标 DNA 的识别。细菌适应性免疫使用 CRISPR(成簇规则间隔短回文重复序列)相关 (Cas) 蛋白以及 CRISPR 转录本来降解外源 DNA。在 II 型 CRISPR-Cas 系统中,指导 RNA 结合后激活 Cas9 核酸内切酶进行 DNA 识别,其机制未知。与单引导 RNA 结合的 Cas9 的晶体结构揭示了与 apo 和 DNA 结合状态不同的构象,其中初始 DNA 询问所需的 10 核苷酸 RNA“种子”序列以 A 型构象预先排列。引导 RNA 的这段对于 Cas9 形成 DNA 识别结构至关重要,该结构准备与双链 DNA 靶序列结合。我们将其解释为“种子”机制的趋同进化,让人想起 Argonaute 蛋白在真核生物 RNA 干扰过程中使用的机制。
更新日期:2015-06-25
down
wechat
bug