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在SARS-CoV-2 Nsp8中,N端域自主折叠并与dSRNA结合
Miguel Á Treviño1, David Pantoja-Uceda1, Douglas V Laurents1
1"Blas Cabrera" Institute for Physical Chemistry, Spanish National Research Council, Serrano 119, Madrid 28006, Spain.
Nucleic acids research
|September 4, 2023
概括
这种SARS-CoV-2的NSP8蛋白质.
科学领域:
- 病毒学 病毒学
- 结构生物学 结构生物学
- 分子生物学分子生物学
背景情况:
- SARS-CoV-2 RNA复制酶复合体对于病毒复制是必不可少的.
- Nsp8蛋白的N端域 (NTD) 在定关键的复制酶组件中起着至关重要的作用.
- Nsp8 NTD的精确构造仍在争论中,与观察到的复杂依赖结构形成对比的疾病预测.
研究的目的:
- 为了阐明SARS-CoV-2 Nsp8 N-终端域 (NTD) 的结构构造.
- 调查与其他复制酶成分在Nsp8 NTD折叠中的相互作用的作用.
- 描述孤立的Nsp8 NTD的dsRNA结合能力.
主要方法:
- 核磁共振 (NMR) 光谱学被用来分析Nsp8 NTD结构.
- 研究了Nsp8 NTD中二级结构元素的自主折叠.
- 评估了dsrna与分离的nsp8ntd的结合.
主要成果:
- SARS-CoV-2 Nsp8 NTD 呈现出高度折叠的二次结构 (两个长α螺旋) 和内在无序的细分体的组合.
- 观察到α螺旋区域的自主折叠,这表明其他部分需要与复制酶伙伴相互作用才能进行适当的折叠.
- 孤立的Nsp8 NTD与双链RNA (dsRNA) 结合,同时保持结构障碍.
结论:
- Nsp8 NTD具有混合结构特征,具有明显的折叠和无序区域.
- 与其他SARS-CoV-2复制酶成分的相互作用可能是Nsp8 NTD.完全折叠所必需的.
- 即使在无序状态下,NSp8 NTD能够结合dsRNA,这突显了它在复制酶复合体内的功能多功能性.
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