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IgA 和 IgM 的结构适应性支持广泛的 SARS-CoV-2 变体中和

Yalcin Pisil¹, Hisatoshi Shida¹, Sandra Morales Ruiz¹

¹Laboratory of Primate Model, Research Center for Infectious Diseases, Institute for Life and Medical Science, Kyoto University, Kyoto, Japan.

Journal of medical virology

|January 15, 2026

概括

不同类型的抗体 (IgG,IgA,IgM) 对SARS-CoV-2变种的有效性各不相同. 由于空间适应性,IgA和IgM对IgG具有潜在的优势,有助于设计新的抗体疗法.

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:

新出现的SARS-CoV-2变种对抗体中和提出了挑战.
抗体的有效性取决于表位突变和抗原呈现.

研究的目的:

将抗RBD抗体 (8A5) 的IgG,IgA和IgM同型的中和能力与18种SARS-CoV-2变体进行比较.
调查影响差异抗体疗效的结构和空间因素.

主要方法:

使用8A5抗体的IgG,IgA和IgM同型对18种SARS-CoV-2变体进行中和评估.
进行突变分析以确定影响抗体结合的关键残留物.
利用负染色电子显微镜可视化维峰分布.
在不同的抗原密度下进行ELISA测定,以评估抗体结合.

主要成果:

确定了三个中和类:对所有异型敏感,对IgG耐药但对IgA/IgM敏感,对所有异型耐药.
特定突变 (S371L-S373P-S375F) 破坏了IgG的结合,而不是IgA/IgM.
L371F突变取消了所有抗体相互作用.
在低抗原密度下,IgG结合显著下降,而IgA和IgM由于其结构和多价值性而保持结合.
空间适应性和几何因素有助于差异中和效率.

结论:

IgA和IgM同型在中和SARS-CoV-2变种方面比IgG具有潜在的优势,特别是那些抗原呈现改变或表位稀疏的变种.
这些发现支持基于IgA和IgM的抗体疗法的合理设计,用于打击当前和未来的病毒威胁.

关键词:

在 IgA A 里面.在IgG IgG的基础上.的IgM IgM 的情况.在SARS-CoV-2中.mAbAb 在线播放中和化中和化中和化

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