增强样本检测揭示了元稳定构造,导致K417N介导的I类抗体逃逸
Xu Pan1, Takashi Tadokoro1,2,3, Taishi Onodera4
1Laboratory of Biomolecular Science, Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan.
Journal of chemical information and modeling
|October 21, 2025
概括
像K417N这样的SARS-CoV-2突变通过改变抗体结合动态来逃避中和抗体. 改进的模拟显示了这些突变如何破坏关键相互作用,有助于开发新的抗体疗法.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 计算生物学 计算生物学
背景情况:
- 新出现的SARS-CoV-2变种具有突变,例如在受体结合域 (RBD) 中,这些突变降低中和抗体 (nAb) 的有效性并促进免疫逃避.
- 鉴定单点突变对抗体结合的影响是困难的,因为在传统的结构分析中,相亲关系较弱,存在挑战.
研究的目的:
- 研究K417N突变对I类抗体 (NT-193) 与SARS-CoV-2 RBD结合的结构和动态影响.
- 了解突变驱动抗体免疫逃避的分子机制.
主要方法:
- 使用增强采样分子动力学 (MD) 模拟与通用复制品交换与溶液化 (gREST).
- 进行了表面等离子体共振 (SPR) 实验,以验证模拟结果.
主要成果:
- 尽管K417N突变具有类似的稳定结合形状,但它显著改变了抗体-RBD相互作用的过渡性转移稳定状态.
- 用阿斯巴拉金替换氨酸会在转移稳定的状态中破坏关键的重链相互作用,从而导致更快的抗体解离.
- SPR实验证实了对K417N突变的显著增加的解离率和降低的结合亲和力.
结论:
- 捕捉短暂和转移稳定的构造对于理解突变驱动的免疫逃避至关重要.
- 该gREST方法有效地揭示了对弱相互作用的抗体-抗原复合体的洞察力.
- 这些发现有助于合理设计下一代抗体疗法,以克服病毒免疫逃逸.
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