在亨德拉病毒附着糖蛋白上的N-链接糖化酶的表征和功能分析
Yamei Feng1,2, Yaohui Li2, Zhang Zhang2
1School of Medicine, Zhejiang University, Hangzhou, 310058, China.
Virology journal
|February 7, 2026
概括
亨德拉病毒 (HeV) 附着糖蛋白 (G) N连接的糖化对病毒进入和膜融合至关重要. 了解这些糖化位点为开发HeV疫苗和治疗方法提供了新的途径.
科学领域:
- 病毒学 病毒学
- 葡萄糖生物学 葡萄糖生物学
- 免疫学 免疫学 免疫学
背景情况:
- 亨德拉病毒 (HeV) 是一种高度致病的动物性亨尼病毒,需要生物安全4级制.
- 病毒的进入是由HeV附着 (G) 和融合 (F) 糖蛋白介导的,G蛋白与受体结合.
- 目前没有批准的疫苗或治疗药物用于人类的肝炎病毒感染.
研究的目的:
- 为了全面描述HEV附着糖蛋白 (HEV-G) 的N连接糖化.
- 阐明N-链 glycans在 HeV G 蛋白功能中的特定位置的作用.
- 为开发新型HeV疫苗和治疗方法提供见解.
主要方法:
- 在Expi293F细胞中表达HeV-G细胞外域的表达.
- 质谱测量以确定糖化位和糖成分.
- 功能性检测包括病毒入口,受体结合,膜融合,抗体中和和免疫性研究.
主要成果:
- 在HeV-G.上发现了7个N结合和多个O结合的糖化位点.
- 茎残留物 (N72,N159) 的N-甘氨酸主要含有高曼诺斯,而头部域位 (N306,N378,N417,N481,N529) 主要是复杂型.
- 在N159,N306和N417处去除N-糖显著减少了膜融合;N159对于激发融合至关重要. N529Q突变降低了EB3结合和感染力. 消去N-甘氨酸对抗体中和 humoral 免疫有很小的影响.
结论:
- 这项研究提供了HeV-G糖化模式的详细表征.
- 特定的N-链接糖化位点在HeV G蛋白介导的病毒入口,受体结合和膜融合中发挥着关键作用.
- 这些发现为设计有效的肝炎病毒疫苗和治疗抗体提供了宝贵的见解.
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