SARS CoV-2 尖端采用了不同的形状组合 in situ
bioRxiv : the preprint server for biology
|March 17, 2025
概括
疫苗中使用的重组尖峰 (S) 蛋白与原生SARS-CoV-2 S有动态差异.类似病毒的颗粒显示原生S的动态发生了变化,影响了疫苗表皮图的显示.
科学领域:
- 病毒学 病毒学
- 结构生物学 结构生物学
- 疫苗学 疫苗学 疫苗学
背景情况:
- 工程重组的Spike (S) 蛋白对于疫苗开发和SARS-CoV-2的结构研究至关重要.
- 目前的疫苗,基于重组S,提供短期的保护,随着新出现的变种而减弱.
- 再组合S可能不能完全代表病毒表面上S的原生结构和动态.
研究的目的:
- 为了比较原生,嵌入膜的SARS-CoV-2Spike (S) 蛋白与工程重组S.的结构动态.
- 研究辅助病毒蛋白和膜环境对S动态的影响.
- 评估这些动态对疫苗设计和表位可访问性的影响.
主要方法:
- 使用病毒样颗粒 (VLP),在原生膜环境中显示全长S与辅助蛋白 (E,M,N).
- 采用胺/交换质谱法 (HDX-MS) 来分析蛋白质的结构动力学.
- 将VLP显示的S的HDX-MS数据与工程重组S的数据进行比较.
主要成果:
- 病毒样粒子 (VLP) 显示的S与重组S相比,由于辅助蛋白和膜定,显示了变化的蛋白质间接触.
- 在S2子单元和VLP S.中的protomer间接触点上观察到下降的构造动态.
- 在N终端域 (NTD) 和受体结合域 (RBD) 中,在VLP S和重组S之间发现了最小的动态差异.
结论:
- 工程重组S,虽然对结构确定有用,但可能不能准确地反映本土SARS-CoV-2S.的内在结构动态.
- 辅助蛋白和膜 anchoring 的存在显著影响 S 形状动态.
- 了解这些差异对于开发具有更广泛和更持久保护的下一代疫苗至关重要,潜在地针对超越NTD和RBD的表征.
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