一个SARS-CoV-2尖峰S2子单元的结构在一个前融合,开放的构造
Eduardo Olmedillas1, Roshan R Rajamanickam1, Ruben Diaz Avalos1
1Center for Infectious Disease and Vaccine Research, La Jolla Institute for Immunology, La Jolla, CA 92037, USA.
bioRxiv : the preprint server for biology
|January 3, 2024
概括
科学家们从SARS-CoV-2尖端蛋白中设计了一个稳定的S2-only抗原. 这种抗原揭示了病毒.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
背景情况:
- SARS-CoV-2 尖端糖蛋白对于病毒进入至关重要,也是疫苗的目标.
- S2融合子单元是保存的,对病毒功能至关重要,使其成为广泛免疫的潜在目标.
- 由于S2亚单元的固有不稳定性和形状灵活性,阻碍了其作为免疫原体的发展.
研究的目的:
- 为了设计一种稳定的S2-only抗原,模仿融合前的病毒形状.
- 在高分辨率下可视化前融合S2形状.
- 识别和描述针对S2亚单元的人类抗体.
主要方法:
- 一个稳定的S2-only抗原的工程.
- 电子显微镜 (cryo-EM) 用于高分辨率的结构分析.
- 从接种疫苗和康复的个体中分离和表征单克隆抗体 (mAbs).
主要成果:
- 一种S2-only抗原成功地被设计成保持其融合前的形状.
- 获得了预注射S2子单元的高分辨率冷EM结构,揭示了"开放"的形状.
- 该结构阐明了稳定相互作用和在开放的S2构造中重新定位的融合.
- 确定了一组针对S2的自然人体抗体.
结论:
- 工程S2抗原为开发下一代冠状病毒增强免疫原提供了一个平台.
- 高分辨率结构阐明了冠状病毒尖端蛋白的动态"呼吸"机制.
- 了解S2结构和抗体反应可以为疫苗的设计提供信息,从而产生更广泛,更持久的免疫力.
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