循环四乙酸结合会诱导蛋白质二元体的二分化,以激活与CRISPR相关的PIN核酶
Fang Wang1, Pengpeng Zhao1, Xiaonan Bi1
1CRISPR and Archaea Biology Research Center, State Key Laboratory of Microbial Technology and Microbial Technology Institute, Shandong University, Qingdao 266237, China.
Nucleic acids research
|August 12, 2025
概括
研究人员描述了CaPN,这是一种新的CRISPR-Cas效应蛋白. 它感知循环四甲基乙酸 (cA4) 激活RNA裂变,调解古生物的抗病毒防御.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 第三类CRISPR-Cas系统使用循环橄基酸盐 (cOAs) 作为第二信使.
- 含有CARF域的蛋白质感知COA,以激活下游效应器以进行抗病毒防御.
- 许多CRISPR辅助因子仍然没有被描述.
研究的目的:
- 为了描述来自Saccharolobus islandicus的新型CRISPR相关蛋白CaPN.
- 阐明由CaPN传感cOA和效应器激活的机制.
- 了解CaPN激活的结构基础.
主要方法:
- 生物化学测试以确定酶活性和基质特异性.
- 基因测试以评估CaPN的体内功能.
- 用X射线结晶学来确定在apo和cA4结合状态下CaPN的结构.
主要成果:
- 在CaPN的CARF域中,可以感知循环四甲基乙酸 (cA4).
- cA4结合激活了CaPN的PIN域,从而实现了强大的RNA分裂.
- 在CA4感知时,CaPN调解宿主生长停止/细胞死亡.
- 结构分析显示,cA4结合会诱导形状变化,导致PIN域激活.
结论:
- CaPN是一种新的cA4激活的CRISPR-Cas辅助RNase.
- 通过CARF域感知cA4,全osterically激活PIN核酶域.
- 这项研究揭示了CRISPR信号通路激活的新分子机制.
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