HHV-6B U20糖蛋白与ULBP1结合,使其无法被NKG2D识别,并干扰自然杀手细胞激活
Grant C Weaver1,2, Christine L Schneider3, Aniuska Becerra-Artiles2
1Immunology and Microbiology Graduate Program, Morningside Graduate School of Biomedical Sciences, UMass Chan Medical School, Worcester, MA, United States.
Frontiers in immunology
|July 2, 2024
概括
人类疹病毒6B U20蛋白与ULBP1结合,通过阻止NKG2D受体的参与,阻止自然杀手细胞的激活. 这种病毒机制有助于HHV-6B逃避免疫反应.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 结构生物学 结构生物学
背景情况:
- 人类疹病毒6B (HHV-6B) 通过降低MHC-I的调节来规避宿主免疫力,影响CD8+ T细胞和自然杀手 (NK) 细胞的反应.
- HHV-6B感染降低NKG2D受体连体MICB,ULBP1和ULBP3的调节,这对NK细胞激活至关重要.
- HHV-6A U20糖蛋白与ULBP1下调有关,但其机制尚不清楚.
研究的目的:
- 研究HHV-6B U20在调节NK细胞活性中的作用.
- 为了确定HHV-6B U20和NK细胞连接体/受体之间的相互作用.
- 评估U20对NK细胞激活的影响.
主要方法:
- 使用了复合HHV-6B U20蛋白和U20转的点细胞.
- 评估了与NK细胞配体 (ULBP1) 和受体 (NKG2D) 的结合相互作用.
- 采用小角度X射线散射和机器学习用于U20-ULBP1综合体的结构建模.
主要成果:
- HHV-6B U20直接与ULBP1结合,具有亚微分子亲和力.
- U20表达减少NKG2D与细胞表面ULBP1的结合,而不会改变ULBP1水平.
- 由ULBP1.1.介导的U20转导和HHV-6B感染阻断NK细胞激活由ULBP1.1.介导.
结论:
- HHV-6B U20直接干扰NKG2D-ULBP1相互作用,这是NK细胞激活的关键途径.
- 这种病毒机制使HHV-6B能够抑制NK细胞介导的杀死,促进病毒免疫逃避.
- 结构建模为U20-ULBP1复合体提供了洞察力,类似于其他病毒-连接体相互作用.
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