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SARS-CoV-2 Omicron XBB 血统尖峰结构,形状,抗原性,以及受体识别
Qianyi E Zhang1, Jared Lindenberger2, Ruth J Parsons1
1Duke University, Duke Human Vaccine Institute, Durham, NC 27710, USA; Duke University, Department of Biochemistry, Durham, NC 27710, USA.
像XBB这样的新型SARS-CoV-2变种显示出增强的免疫逃避和传播能力. 结构分析揭示了尖端蛋白突变如何稳定病毒,影响受体结合和免疫逃生.
科学领域:
- 病毒学 病毒学
- 结构生物学 结构生物学
- 免疫学 免疫学 免疫学
背景情况:
- 严重急性呼吸道综合征冠状病毒2 (SARS-CoV-2) Omicron变种XBB在2022年底出现,导致后代的血统增加了免疫逃避和传染能力.
- 了解这些适应的结构基础对于预测病毒演变和开发对策至关重要.
研究的目的:
- 从关键的XBB谱系变体 (XBB.1.5,XBB.1.16,EG.5和EG.5.1) 来确定SARS-CoV-2尖端 (S) ECTODOMAIN的冷电子显微镜 (冷-EM) 结构.
- 阐明这些变种增强的免疫逃避和传播能力背后的结构机制.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定来自SARS-CoV-2变种XBB.1.5,XBB.1.16,EG.5和EG.5.1.1的尖端外体结构.
- 分析的重点是受体结合域 (RBD) 构造,原原体间相互作用以及特定突变对S蛋白稳定性和呈现的影响.
主要成果:
- 结构显示强化闭合状态与受体无法访问的RBDs,通过类似于BA.1和BA.2的protomer间RBD相互作用进行介导.
- XBB.1.5和XBB.1.16表现出改善的RBD稳定性,弥补了早期的Omicron突变.
- 在EG.5中F456L的替代减少了RBD的稳定性,而S1子单元的突变影响了S2子单元的构造和表位表现.
结论:
- SARS-CoV-2 S 蛋白质的持续演变涉及稳定性,受体结合和免疫逃避的同时优化.
- 相对较少的残留物替代可以大大改变S蛋白的结构格局,影响病毒性质.
- 这些发现为推动最近SARS-CoV-2变种传播的结构适应提供了洞察力.
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