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通过SARS-CoV-2识别受体的结构基础
Jian Shang1, Gang Ye1, Ke Shi2
1Department of Veterinary and Biomedical Sciences, University of Minnesota, Saint Paul, MN, USA.
Nature
|April 1, 2020
概括
了解SARS-CoV-2如何与人类的ACE2结合,对于抗击COVID-19至关重要. 结构分析揭示了SARS-CoV-2尖端蛋白的主要特征
科学领域:
- 病毒学
- 结构生物学
- 生物化学
背景情况:
- 新型冠状病毒SARS-CoV-2导致COVID-19大流行.
- 了解病毒进入机制,特别是受体识别,对于控制SARS-CoV-2至关重要.
- 无论是SARS-CoV-2还是SARS-CoV,都使用人类血管酶转化酶2 (ACE2) 作为细胞受体.
研究的目的:
- 确定与人类ACE2复合的SARS-CoV-2尖端蛋白的受体结合域 (RBD) 的晶体结构.
- 与SARS-CoV相比,阐明SARS-CoV-2增强的ACE2结合 afinity 的结构基础.
- 研究与SARS-CoV-2密切相关的蝙蝠冠状病毒RaTG13的ACE2识别机制.
主要方法:
- 进行X射线结晶学以确定SARS-CoV-2 RBD-ACE2复合物的结构.
- 在SARS-CoV-2 RBD和SARS-CoV RBD之间进行结构比较分析.
- 评估ACE2结合亲和力和受体使用的功能测试.
主要成果:
- 与SARS-CoV RBD相比,晶体结构显示SARS-CoV-2 RBD中的ACE2结合更为紧.
- 在SARS-CoV-2 RBD中的特定残留物变化稳定了RBD-ACE2接口的关键结合热点,增加了结合亲和力.
- 相关的蝙蝠冠状病毒RaTG13也使用人类的ACE2,这表明共享受体识别机制.
结论:
- SARS-CoV-2 RBD 的结构特征增强了它与人类 ACE2 的结合性,可能有助于其有效的传播.
- 在SARS-CoV-2,SARS-CoV和RaTG13中对ACE2识别的比较分析提供了潜在的动物源和物种间传播的见解.
- 这种结构性理解指导了针对SARS-CoV-2入侵的针对性干预策略的开发.
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