Molecular organization of the type II-A CRISPR adaptation module and its interaction with Cas9 via Csn2.

Molecular organization of the type II-A CRISPR adaptation module and its interaction with Cas9 via Csn2.
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DOI:
10.1093/nar/gky702
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发表时间:
2018-10-12
影响因子:
14.9
通讯作者:
Bae E
Bae E
中科院分区:
生物学2区
文献类型:
--
作者:
Ka D;Jang DM;Han BW;Bae E

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成簇的规则间隔的短回文重复序列 (CRISPR) 和 CRISPR 相关 (Cas) 蛋白提供微生物针对入侵的外来核酸的适应性免疫。在 II-A 型 CRISPR-Cas 系统中,Cas1-Cas2 整合酶复合物和亚型特异性 Csn2 构成 CRISPR 适应模块,该模块与 Cas9 核酸酶效应子配合进行间隔区选择。在这里,我们报告了化脓性链球菌 II-A 型 CRISPR 适应模块的分子组织及其通过 Csn2 与 Cas9 的相互作用。我们确定了化脓性链球菌 II-A Cas2 型的晶体结构。色谱和量热分析揭示了由 Cas1、Cas2 和 Csn2 组成的 II-A 型适应模块的化学计量和拓扑结构。我们还证明了 Cas9 以直接和化学计量的方式与 Csn2 相互作用。我们的结果揭示了 II-A 型 Cas 蛋白之间的分子相互作用网络,并强调了 Csn2 在协调 Cas 组件(参与 CRISPR 介导的免疫的适应和干扰阶段)中的作用。
Clustered regularly interspaced short palindromic repeats (CRISPRs) and CRISPR-associated (Cas) proteins provide microbial adaptive immunity against invading foreign nucleic acids. In type II-A CRISPR–Cas systems, the Cas1–Cas2 integrase complex and the subtype-specific Csn2 comprise the CRISPR adaptation module, which cooperates with the Cas9 nuclease effector for spacer selection. Here, we report the molecular organization of the Streptococcus pyogenes type II-A CRISPR adaptation module and its interaction with Cas9 via Csn2. We determined the crystal structure of S. pyogenes type II-A Cas2. Chromatographic and calorimetric analyses revealed the stoichiometry and topology of the type II-A adaptation module composed of Cas1, Cas2 and Csn2. We also demonstrated that Cas9 interacts with Csn2 in a direct and stoichiometric manner. Our results reveal a network of molecular interactions among type II-A Cas proteins and highlight the role of Csn2 in coordinating Cas components involved in the adaptation and interference stages of CRISPR-mediated immunity.
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