关于SARS-CoV-2尖端蛋白对TLR4激活的结构性见解:对炎症反应调制的影响
Priya Prakasam1, Thripthi Nagesh Shenoy2, Abdul Ajees Abdul Salam3
1Department of Bioinformatics, Pondicherry University, Kalapet, Pondicherry, 605 014, India.
Molecular diversity
|September 13, 2025
概括
在SARS-CoV-2尖端蛋白S1亚单元与托尔类受体4 (TLR4) /MD2复合体结合. 单质尖蛋白比三元体具有更强的结合,这表明免疫过度激活的机制.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 结构生物学 结构生物学
背景情况:
- 与骨髓分化因子2 (MD2) 复合的托尔类受体4 (TLR4) 在病毒感染期间对天生的免疫力至关重要.
- 病毒葡萄糖蛋白,如SARS-CoV-2尖峰 (S) 蛋白,可能不适当地激活TLR4,可能导致细胞因子风暴.
研究的目的:
- 研究SARS-CoV-2尖端蛋白 (单体和三元体) 与TLR4/MD2受体复合体之间的分子相互作用.
- 阐明尖端蛋白对潜在异常TLR4激活的结构基础.
主要方法:
- 使用了全面的in silico框架,包括蛋白质-蛋白质对接.
- 进行了扩展的分子动力学模拟 (500 ns),相互作用分析,主要成分分析 (PCA) 和结合亲和度计算.
主要成果:
- S1子单元,特别是受体结合域 (RBD) 和N端域 (NTD),被确定为TLR4/MD2.2.的主要结合接口.
- 与三元体相比,尖峰单体与TLR4/MD2的相互作用更稳定,更强烈.
- 确定了特定的热点残留物和糖化位在调节受体相互作用中的潜在作用.
结论:
- SARS-CoV-2 尖端蛋白通过域特异性相互作用,主要通过其 S1 子单元,与 TLR4/MD2 接触.
- 这些相互作用,特别是与单体形式的相互作用,可能会导致异常的先天免疫信号和细胞因子风暴.
- 确定了调节TLR4介导免疫反应的潜在治疗点.
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