人类中和抗体准H7N9血凝素头部的保护侧面补丁
Manxue Jia1, Hanjun Zhao2,3, Nicholas C Morano1,4
1Aaron Diamond AIDS Research Center, Columbia University Vagelos College of Physicians and Surgeons, New York, NY, 10032, USA.
Nature communications
|May 27, 2024
概括
研究人员发现了针对禽流感A型病毒H7N9.9的强有力的中和抗体. 这些抗体向血凝蛋白的保存区域,为新的H7N9治疗和预防策略提供了潜力.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
背景情况:
- 禽流感A型病毒H7N9构成严重威胁,人类死亡率高.
- 目前,对于H7N9感染,人类没有专门的预防或治疗方法.
研究的目的:
- 为了分离和表征对H7N9血凝素 (HA) 蛋白反应的单克隆抗体 (mAbs).
- 研究这些mAbs对H7N9.9的中和能力和保护作用.
- 阐明抗体介导病毒中和的结构基础.
主要方法:
- 从人类康复病例中分离了四种HA-反应单克隆抗体 (mAbs).
- 在体外中和化试验和体内保护研究在雌性小鼠.
- 电子显微镜 (Cryo-EM) 用于结构的确定.
- 序列分析以评估表位保护.
主要成果:
- 两个HA1导向的mAbs,H7.HK1和H7.HK2,强烈中和H7N9并保护小鼠免受致命的挑战.
- 低温电磁波检测显示,这些mAbs的目标是保存的横向HA1超位,破坏病毒的进入.
- 抗体对后来的H7N9分离物保持了有效性,表明了保存的表位.
- 一个HA2导向的mAb (H7.HK4) 在与H7.HK2.2结合时显示出增强的保护.
结论:
- 发现了针对保存的横向HA1超位的抗体,能够有效中和H7N9.
- 确定一种潜在的治疗策略,使用中和HA1 mAbs,可能增加HA2 mAbs.
- 结构性见解为开发广泛保护性流感治疗提供了基础.
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