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蝙蝠沙贝科病毒WIV1-CoV携带一种适应性突变,改变了尖峰动态并增强了ACE2结合
Alexandra L Tse1, Gorka Lasso1, Jacob Berrigan1
1Department of Microbiology and Immunology, Albert Einstein College of Medicine, New York, New York, United States of America.
PLoS pathogens
|October 16, 2025
概括
像SHC014-CoV和WIV1-CoV这样的蝙蝠沙贝科病毒显示其尖端蛋白中的遗传适应,增强了ACE2结合和细胞进入. 这些变化可能会促进动物传播的蔓延,为SARS-CoV-2的出现提供了替代途径.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 进化生物学 进化生物学
背景情况:
- 蝙蝠sarbecoviruses构成了显著的动物感染威胁,但溢出的遗传机制尚未完全理解.
- 之前的研究已经确定了受体结合域 (RBD) 外的遗传通路,可以增强蝙蝠冠状病毒SHC014-CoV.的尖端开放,ACE2结合和细胞进入.
- 广泛研究的蝙蝠冠状病毒WIV1-CoV很可能是细胞培养适应的变种.
研究的目的:
- 研究蝙蝠萨尔贝科病毒的遗传适应,特别是WIV1-CoV,这些适应促进细胞进入和ACE2结合.
- 了解蝙蝠sarbecoviruses的进化途径和潜在的溢出机制.
- 为了比较WIV1-CoV的适应策略与以前研究的蝙蝠冠状病毒,如SHC014-CoV.
主要方法:
- 蝙蝠沙贝科病毒的序列分析,包括WIV1-CoV和RS3367-CoV.
- 伪型系统分析以评估尖端蛋白活性,ACE2结合和细胞进入.
- 研究了特定氨基酸替代的作用,例如S1子单元的"630循环".
- 评估了用素进行预分离对尖端蛋白质构造和功能的影响.
主要成果:
- WIV1-CoV的原始突起类似于RS3367-CoV的突起,这表明WIV1-CoV是一种细胞培养适应变异.
- 在S1子单元的"630循环"中单个氨基酸替代是WIV1-CoV隔离的关键适应,增强尖端开放,受体识别和细胞进入.
- 对SHC014-CoV和Rs3367-CoV尖端的合规约束可以通过试素预裂解来缓解,这表明替代物可能会绕过S1-S2裂解的需要.
- 这些适应性表明,在自然蝙蝠宿主中,有潜在的便口服生活方式和免疫逃避策略.
结论:
- 蝙蝠sarbecoviruses中的尖端开放替代物增强了ACE2结合和细胞进入,可能会在SARS-CoV-2中看到的分裂部位适应之前或取代.
- 这些发现表明蝙蝠沙贝科病毒的替代溢出场景,突出强调了解它们的进化适应的重要性.
- "锁定"的尖峰形状和依赖S1-S2裂变可能是蝙蝠sarbecoviruses的常见优化,影响它们的动物感染潜力.
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