在dsRNA上的ADAR1 dsRBD3-PKR激酶域相互作用抑制了PKR激活
Ketty Sinigaglia1, Anna Cherian1, Qiupei Du1
1Central European Institute for Technology at Masaryk University (CEITEC MU), Building E35, Kamenice 735/5, 625 00 Brno, Czechia; National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czechia.
Cell reports
|August 15, 2024
概括
作用于RNA 1 (ADAR1) 的腺胺酶抑制蛋白激酶R (PKR) 激活,防止小鼠的胚胎死亡. 这种相互作用对于通过调节干扰素反应来维持肠道完整性和长期生存至关重要.
科学领域:
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
- 遗传学 遗传学是一种遗传学.
背景情况:
- 异常的干扰素诱导导致阿达尔无突变小鼠的胚胎致死性.
- 缺乏Adar和Mav的小鼠表现出早期产后致死性,肠道损伤与蛋白激酶R (PKR) 激活有关.
研究的目的:
- 调查作用于RNA 1 (ADAR1) 的腺氨酸脱氨酶对PKR介导致死性的保护作用.
- 为了阐明ADAR1-介导PKR抑制的分子机制.
主要方法:
- 产生和分析Adar,Mavs和Eifak2 (PKR) 突变小鼠模型.
- 同免疫沉测试检测蛋白质相互作用.
- AlphaFold结构建模用于预测绑定接口.
- 在体外实验中,在A549细胞中使用人类ADAR1来评估PKR激活.
主要成果:
- 三重突变小鼠 (Adar Mavs Eifak2) 显示了被拯救的致命性和肠道缺陷,表明PKR的核心作用.
- ADAR1和PKR共同免疫,这表明它们之间存在直接的相互作用.
- 结构建模表明ADAR1的dsRBD3和PKR的激酶域之间存在抑制相互作用.
- 在人类细胞中,ADAR1表达抑制了内源PKR激活,这取决于dsRNA结合和特定的ADAR1-PKR接触.
结论:
- ADAR1直接与PKR激活相互作用并抑制它,防止致命的干扰素反应.
- 这种相互作用需要ADAR1 dsRNA的结合,以及涉及ADAR1 dsRBD3.3的特定接触接口.
- 这种机制突显了ADAR1在天生的免疫力和预防PKR驱动病理方面的关键作用.
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