尽管存在多种病毒对抗剂,但Tetherin限制了SARS-CoV-2
Elena Hagelauer1, Rishikesh Lotke1, Dorota Kmiec2
1Institute for Medical Virology and Epidemiology of Viral Diseases, University Hospital Tübingen, 72076 Tübingen, Germany.
Viruses
|December 23, 2023
概括
在SARS-CoV-2中,使用Spike和ORF7a蛋白来抵消宿主限制因子Tetherin. 这些病毒对抗剂部分克服了Tetherin.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 铁是一种干扰素刺激的基因产物,可以限制包裹病毒的释放.
- 严重急性呼吸系统综合征相关的冠状病毒 (SARS-CoV) 和SARS-CoV-2编码的蛋白质对抗Tetherin.
- 斯派克 (S) 和ORF7a蛋白质是已知的SARS-CoV和SARS-CoV-2对Tetherin的对手.
研究的目的:
- 直接比较SARS-CoV和SARS-CoV-2Spike和ORF7a蛋白质在对抗Tetherin中的疗效和机制.
- 研究这些病毒抗剂对Tetherin水平和功能的影响.
- 评估内源性Tetherin在限制SARS-CoV-2复制中的作用.
主要方法:
- 流细胞计和西部斑点分析以量化细胞表面和Tetherin总水平.
- 在细胞系中表达来自SARS-CoV和SARS-CoV-2的ORF7a和Spike蛋白.
- 两种混合测试以确定病毒蛋白和Tetherin之间的直接相互作用.
- 泰林淘汰赛细胞系评估其在SARS-CoV-2复制中的作用.
主要成果:
- 在SARS-CoV-2中,Spike和ORF7a蛋白比HEK293T细胞中的SARS-CoV对应物更有效地降低了总Tetherin水平.
- 来自SARS-CoV和SARS-CoV-2的ORF7a改变了Tetherin的糖化.
- 斯派克蛋白降低泰林水平的能力在SARS-CoV-2变体 (α, γ, δ, ο) 中保持不变.
- 虽然SARS-CoV-2 Spike和ORF7a都与Tetherin共聚,但只有ORF7a与它直接相互作用.
- 尽管存在病毒对抗剂,但在缺乏Tetherin的Caco-2细胞中,SARS-CoV-2复制增强.
结论:
- 内源性Tetherin作为对SARS-CoV-2复制的限制因素.
- 在SARS-CoV-2中,Spike和ORF7a蛋白质具有独特且互补的机制来抵消Tetherin.
- 泰林的抗病毒活性只被这些病毒抗剂部分克服.
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