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人类感染H3N8流感A病毒受体结合适应的结构基础

Tianjiao Hao¹, Yufeng Xie^2,3, Yan Chai³

¹Beijing Life Science Academy, Beijing, China.

Journal of virology

|February 24, 2025

概括

感染人类的禽源H3N8流感病毒表现出双受体结合,突变增强了人类受体相互作用. 由于独特的抗原部位影响疫苗疗效,进一步监测至关重要.

科学领域:

病毒学病毒学
结构生物学结构生物学
公共卫生公共卫生

背景情况:

禽源H3N8流感A型病毒 (IAV) 正在感染人类,引发公共卫生问题.
IAV对新宿主的适应通常涉及血凝素 (HA) 的变化,但H3N8对人类的适应尚未完全理解.
以前的研究表明,人类分离的H3N8可以在之间传播,HA-G228S突变对空气传播至关重要.

研究的目的:

为了研究从人类分离物中获得的H3N8血凝素 (HA) 的受体结合特性.
阐明H3N8 HA中双受体结合的结构基础.
评估特定突变 (G228S,Q226L) 对H3N8 HA受体偏好和结合的影响.

主要方法:

对H3N8 HA蛋白序列的分析,包括对退行性编码子的识别.
使用鸟类和人类受体类似物对受体结合性质的研究.
低温电子显微镜 (Cryo-EM) 用于确定H3N8 HAs与受体类似物结合的结构.
突变性研究,以评估特定HA突变对受体结合的影响.

主要成果:

H3N8 HAs 具有双重受体结合特性,主要偏爱鸟类受体.
替代G228S稍微增强了与人类受体的结合,而Q226L则将偏好从鸟类转移到人类受体.
化EM结构揭示了H3N8 HA的双受体结合能力的分子基础.
与H3N2相比,H3N8 HA具有不同的抗原位点,这引发了人们对当前疫苗有效性的担忧.

结论:

目前的H3N8人类分离体显示适应潜力,但尚未有效适应人对人传播.
G228S突变在增强人类受体结合和病毒适应方面发挥作用.
独特的H3N8抗原性质需要持续监测,并可能挑战疫苗的疗效,需要持续监测和潜在的疫苗更新.

关键词:

这种病毒是H3N8病毒.禽流感病毒是禽流感病毒的一种病毒.双接收器结合双接收器结合主机跳跃主机跳跃主机跳跃感染人类感染人类.结构的结构结构的结构.

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