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人类抗体的结构基础针对SARS-CoV-2核体蛋白质二分化领域,并干扰RNA结合
Shaojie Xue1, Suhua He2, Zhaoxia Huang1
1Molecular Imaging Center, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, Guangdong, China.
Communications biology
|August 19, 2025
概括
一种新的人类抗体,nCoV400Fab,阻止了SARS-CoV-2核囊蛋白.
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:
- 由于SARS-CoV-2转变为季节性病原体,因此需要持久的免疫保护.
- 核体 (N) 蛋白因其免疫性而成为疫苗和治疗药物的关键标.
- N-终端C终端域 (N-CTD) 对于病毒RNA结合和液态-液态相分离 (LLPS) 是至关重要的.
研究的目的:
- 阐明准N-CTDRNA结合表面的分子机制.
- 研究抗体作为N-CTD功能的抑制剂的潜力.
主要方法:
- 确定了SARS-CoV-2 N-CTD与nCoV400Fab抗体复合的晶体结构,分辨率为2.06 Å.
- 利用功能测试来评估nCoV400Fab对病毒核糖蛋白 (vRNP) 组装和LLPS的影响.
主要成果:
- 这种nCoV400Fab抗体与N-CTDRNA结合表面的基本残留物结合,从而形成固体阻塞.
- 这种阻塞有效地抑制了病毒RNA与N-CTD结合.
- nCoV400Fab破坏了vRNP组合和RNA诱导的凝结物形成.
结论:
- 人类抗体可以结构性地抑制SARS-CoV-2 N-CTD的RNA结合功能.
- 这种机制为开发向N蛋白的宏分子抑制剂提供了基础.
- 这些发现支持开发针对SARS-CoV-2的新疗法和疫苗.
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