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SARS-CoV-2 NSP1诱导了核糖体上的mRNA裂变
Yann Tardivat1, Piotr Sosnowski1, Antonin Tidu1
1Université de Strasbourg, Institut de Biologie Moléculaire et Cellulaire, Architecture et Réactivité de l'ARN, CNRS UPR9002, 2, allée Konrad Roentgen, F-67084 Strasbourg, France.
Nucleic acids research
|July 28, 2023
概括
严重急性呼吸道综合征冠状病毒2 (SARS-CoV-2) 蛋白质NSP1会以不同的方式分裂宿主和病毒信使RNA (mRNA). 这些独特的裂纹模式,由NSP1介导.
科学领域:
- 分子生物学分子生物学
- 病毒学 病毒学
- 生物化学 生物化学
背景情况:
- 严重急性呼吸道综合征冠状病毒2 (SARS-CoV-2) 利用非结构性蛋白1 (NSP1) 抑制宿主细胞转化.
- NSP1结合了核糖体的mRNA入口通道,阻碍了宿主mRNA的翻译.
- 病毒5'-未翻译区域 (UTR) 可以逃避NSP1-介导的抑制.
研究的目的:
- 为了研究NSP1介导的mRNA裂变的机制.
- 通过NSP1.1来描述宿主与病毒mRNA的独特裂变模式.
- 为了确定NSP1负责mRNA分裂活动的域.
主要方法:
- 核糖体结合的mRNA分裂试验. 核糖体结合的mRNA分裂试验.
- 在宿主和SARS-CoV-2RNA中分析裂变部位的特异性.
- 局部定向突变发生,以评估NSP1域.
- 检测RNA结构 (SL1头发针).
主要成果:
- 在宿主和病毒5'UTR中,NSP1会诱导明显的内核分解裂变模式.
- 主体mRNAs在5'帽 (6-11nt) 附近被切割,独立于序列.
- 在高NSP1度下,SARS-CoV-2RNAs在45位,46位和49位表现出序列特定的裂变.
- NSP1的N终端域对于裂变至关重要且足够.
- 在低NSP1度下,SL1发针保护病毒RNA免受降解.
结论:
- NSP1使用不同的mRNA分裂策略来对抗宿主和病毒RNA.
- 核糖体结合和特定的RNA结构影响NSP1分裂活动.
- NSP1的N端域包含了催化活性,由构造变化揭示出来.
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