在受体结合部位的N-糖化驱动着B型流感病毒系之间的受体结合特异性的差异
Caroline K Page1,2,3, M H M Mubassir2,4, Pradeep Chopra2,5
1Center for Vaccines and Immunology, University of Georgia, Athens, Georgia, USA.
Journal of virology
|November 5, 2025
概括
研究了B型流感病毒血凝素的特异性. 一个关键的N-糖化位点调节了与酸的结合,解释了血统差异和Yamagata血统的灭绝.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
背景情况:
- 流感B型病毒 (FLUBVs) 导致人类严重的呼吸系统疾病.
- 了解FLUBV血质素 (HA) 受体特异性对于宿主热带性和病原性至关重要.
- 与A型流感病毒相比,FLUBV HA受体特异性的决定因素的理解较少.
研究的目的:
- 为了全面定义FLUBVs在不同谱系和时间段的受体结合特征.
- 确定控制FLUBV HA受体特异性的分子决定因素.
- 阐明血统特异性热带主义和山口血统消失背后的机制.
主要方法:
- 利用糖甘微阵列来分析FLUBV受体结合的情况.
- 使用病毒-糖甘结合试验进行确认.
- 使用野生类型和逆遗传FLUBVs在HA受体结合部位 (RBS) 中发生突变.
- 纳入了HA-糖甘相互作用的结构建模.
主要成果:
- 定义的受体特异性为早期,维多利亚,和Yamagata血统FLUBVs超过50年.
- 确定了HA RBS中氨基酸196的N-糖化位点,作为酸结合宽度的主要决定因素.
- 维多利亚血统病毒与Yamagata血统病毒相比,表现出更广泛的受体特异性.
- 最近成功的维多利亚亚类失去了这种糖化位点,允许与人类和鸟类酸结合.
结论:
- 在HA氨基酸196处的N结合甘氨酸是FLUBV受体特异性的关键调节者.
- 这种糖化位点解释了维多利亚和雅马加塔血统之间的血统特定的结合差异.
- 维多利亚血统病毒中这种糖化位点的丧失可能会带来健身优势,并导致它们的特有活动增加和Yamagata血统的灭绝.
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