突变和ACE2诱导的Allosteric网络重新连接在delta和OmicronSARS-CoV-2尖端蛋白中
Mandira Dutta1, Gregory A Voth1
1Department of Chemistry, Chicago Center for Theoretical Chemistry, Institute for Biophysical Dynamics, and James Franck Institute, The University of Chicago, Chicago, IL 60637.
bioRxiv : the preprint server for biology
|November 26, 2025
概括
这项研究揭示了SARS-CoV-2变种Delta和Omicron如何在它们的尖端蛋白中使用不同的全性传播途径,影响病毒的进入和传染性. 了解这些网络有助于设计适应性抗病毒策略来对抗不断变化的变种.
科学领域:
- 病毒学和结构生物学
- 计算生物物理学的计算生物物理学
背景情况:
- 严重急性呼吸道综合征冠状病毒2 (SARS-CoV-2) 尖端蛋白通过其受体结合域 (RBD) 与宿主ACE2结合,促进病毒进入.
- 尖端蛋白变体中的突变改变了病毒感染力和形状动态.
- 尖端蛋白内长距离的全osteric 通信会影响病毒功能,对于抗病毒药物设计至关重要.
研究的目的:
- 为了划分SARS-CoV-2的三角形和奥米克朗尖尖蛋白中的全性通信网络.
- 为了确定关键的残留物和途径调解全信号传递.
- 了解ACE2结合和变异特异性突变如何影响这些网络的潜在抗病毒发展.
主要方法:
- 原子分子动力学 (MD) 模拟Delta和Omicron尖端蛋白 (ACE2结合和不结合).
- 线性相互信息 (LMI) 计算用于绘制通信通道的地图.
- 基于图形理论的分析,包括中间的中心性,以确定关键的中间体残留物.
主要成果:
- 结合ACE2显著增强了跨蛋白的全结合.
- 三个关键链接器 (NTD-RBD,RBD-SD1,SD2-FP) 被确定为主要的全介质.
- 德尔塔通过Link1/Link2显示更强的信号; 欧米克朗通过Link3重定向通信,形成更广泛的S1网络并建立远程S1-S2合.
- 在Omicron中,特定的突变 (N856K,T547K) 重构了全性通路,导致与Delta相比,不同的域级合.
结论:
- 在SARS-CoV-2尖端蛋白中的变异特异性全网络影响融合性和免疫逃避.
- 通过关键突变形成的Omicron独特的全网络与Delta的明显不同.
- 绘制这些网络的地图为开发针对新出现的SARS-CoV-2变种的广泛抗病毒策略提供了一个框架.
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