在全长的RIG-I中对RNA驱动的结构变化进行表征,从而导致其对抗或对抗
Justyna Sikorska1, Yan Hou1, Paul Chiurazzi1
1Merck & Co., Inc., Rahway, NJ, USA.
Nucleic acids research
|July 24, 2023
概括
网红酸诱导基因-I (RIG-I) 检测病毒RNA以启动抗病毒免疫. 这项研究使用了NMR来显示RNA结合,而不是ATP,通过释放信号域驱动RIG-I激活.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- RIG-I是病毒RNA的关键细胞质传感器,通过I型干扰素诱导启动先天免疫反应.
- 它的机制涉及C端域 (CTD) 的RNA识别和通过CARD域发送信号,但ATP在CARD射出中的作用仍在争论中.
研究的目的:
- 用NMR光谱学研究ATP和RNA结合在RIG-I激活中的作用.
- 阐明RIG-I在结合不同RNA类型和核酸时发生的构造变化.
主要方法:
- 利用全长的NMR光谱,选择性地标有氨酸的RIG-I.
- 研究了与5'-三酸盐和5'-OH dsRNA在核酸的存在和缺席中的相互作用.
主要成果:
- 在CTD,酶和CARD域中发现了对RNA诱导的构造变化敏感的特定残留物.
- 结果支持一种模型,其中RNA结合,而不是ATP,是CARD域释放的主要驱动因素.
结论:
- RNA结合是触发RIG-I激活和下游信号的主要事件.
- 这澄清了RIG-I抗病毒免疫反应启动的机制.
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