SARS-CoV-2 中和抗体结构为治疗策略提供了信息
Christopher O Barnes1, Claudia A Jette1, Morgan E Abernathy1
1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA.
Nature
|October 12, 2020
概括
研究人员分类了针对SARS-CoV-2尖端蛋白的人类中和抗体. 这种结构分析揭示了阻断病毒进入的抗体类别和机制,有助于对COVID-19的治疗开发.
科学领域:
- 免疫学
- 结构生物学
- 病毒学
背景情况:
- COVID-19 流行病需要有效的治疗方法,中和抗体针对 SARS-CoV-2 尖端蛋白的 ACE2 受体结合域 (RBD) 显示出显著的前景.
- 了解抗体中和的结构基础对于开发和优化这些疗法至关重要.
研究的目的:
- 通过人类抗体识别严重急性呼吸综合征冠状病毒-2 (SARS-CoV-2) 中和的结构相关性.
- 根据它们与SARS-CoV-2尖端蛋白和RBD的结构相互作用来分类不同类型的中和抗体.
主要方法:
- 解决了与SARS-CoV-2尖端剪切器或RBD复合的人类中和抗体的八个新晶体结构.
- 基于结合部位和相互作用对抗体进行结构比较和表位/表位映射.
- 对SARS-CoV-2突发突变的亲和度测量和分析,以评估抗体逃生机制.
主要成果:
- 根据它们与ACE2的结合 (上/下) 和表皮位位置 (ACE2位点与外部) 将抗体分为四类.
- 阻断ACE2的2类抗体表现出结合上下RBD和接触相邻RBD的能力,其中一个VH3-53抗体将尖端锁定在一个封闭的结构中.
- 观察到与宿主N- glycans的有限相互作用以及体质突变对表位接触的轻微贡献;尖端突变的分析揭示了潜在的病毒逃生途径.
结论:
- 这项研究提供了针对SARS-CoV-2 RBD的抗体的分类系统,有助于评估热情和指导治疗策略.
- 针对抗体与的相互作用的结构见解有助于开发有效的抗体组合用于临床应用.
- 了解这些分类和潜在的逃生机制为对抗SARS-CoV-2的免疫反应和下一代治疗方法的设计提供了宝贵的见解.
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