切割与未切割:福林切割如何重塑SARS-CoV-2尖峰的形态格局
Natesan Mani1, Raghavendran Suresh1, Srirupa Chakraborty1
1Department of Chemical Engineering, Northeastern University, Boston, MA 02115; Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115.
bioRxiv : the preprint server for biology
|March 31, 2025
概括
SARS-CoV-2尖端蛋白的furin裂变通过改变蛋白质动态和灵活性来增强受体结合. 了解这种分裂对于有效的疫苗和治疗开发至关重要.
科学领域:
- 病毒学 病毒学
- 结构生物学 结构生物学
- 免疫学 免疫学 免疫学
背景情况:
- SARS-CoV-2 尖端蛋白质是疫苗的关键标,通常是通过氨酸突变 (2P) 和氨酸切割部位 (FCS) 变化进行修改的.
- 虽然修改增强了稳定性,但蛋白分裂在尖端蛋白动态和ACE2结合中的功能性作用尚未完全理解.
研究的目的:
- 调查素裂变对未结合的,融合前的SARS-CoV-2尖端蛋白的结构和动态性质的影响.
- 为了比较分离与未分离的尖端蛋白质中的构造性景观和性通信.
主要方法:
- 广泛的全原子分子动力学 (MD) 模拟.
- 主要组件分析 (PCA) 用于分析形状动态.
- 分析域间通信和甘氨酸聚类的分析.
主要成果:
- 氨酸裂变显著改变了受体结合域 (RBD) 和N端域 (NTD) 之间的全沟通.
- 切割的Spike蛋白质表现出更大的灵活性,不同的形状景观,以及更广泛的RBD倾斜角度.
- 裂变原始化S2子单元并影响甘氨酸的分布,表明适应性结构反应.
结论:
- 素分裂在尖端蛋白的动力学中起着功能性作用,可能促进ACE2受体的参与.
- 在免疫原设计中删除FCS可能会产生需要考虑的功能后果.
- 了解本地分裂状态对于开发有效的SARS-CoV-2疫苗和治疗方法至关重要.
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