中和抗体防止麻疹病毒融合蛋白的融合后转变
Dawid S Zyla1, Roberta Della Marca2,3,4, Gele Niemeyer1,5
1Center for Vaccine Innovation, La Jolla Institute for Immunology, La Jolla, CA 92037, USA.
Science (New York, N.Y.)
|June 27, 2024
概括
由于疫苗接种率下降,麻疹病毒 (MeV) 构成越来越大的威胁. 研究人员从结构上描述了中和抗体,揭示了它们如何阻断潜在的新型MeV疗法.
科学领域:
- 病毒学
- 结构生物学
- 免疫学
背景情况:
- 麻疹病毒 (MeV) 是一个严重的公共卫生问题,由于疫苗接种率的下降和免疫受损人口的增加而加剧.
- 目前没有有效的治疗方法来治疗MeV感染.
- 针对病毒融合 (F) 蛋白的中和抗体是一个有前途的治疗途径,但缺乏结构特征.
研究的目的:
- 在其注射前和注射后状态下对麻疹病毒融合 (F) 蛋白进行结构性表征.
- 通过针对MeV的保护性单克隆抗体 (mAb) 77阐明中和机制.
- 为开发新型MeV疗法提供结构性见解.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定MeV F蛋白的高分辨率结构.
- 解决了单独预注射F的结构,F与融合抑制复合,F与mAb77复合.
- 为了验证mAb 77结合的功能作用,进行了体外测试.
主要成果:
- 获得了融合前和融合后的MeV F蛋白的高分辨率冷EM结构 (2.1-2.7 Å分辨率).
- 显示单克隆抗体77与前输F蛋白结合.
- 观察到mAb77可以在中间状态下捕获F蛋白,防止其过渡到融合后的形状.
结论:
- 结构数据揭示了mAb 77通过稳定中间融合形态来中和MeV的机制.
- 这些发现为设计针对麻疹的融合抑制疗法提供了结构性基础.
- 这项研究强调了针对病毒融合蛋白来开发抗病毒药物的可能性.
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