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双重化和脂质结合的结合平衡调节SARS Cov 2 Orf9b相互作用和干扰素反应
C J San Felipe1, Jyoti Batra2,3,4, Monita Muralidharan2,3,4
1Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, United States.
eLife
|September 17, 2025
概括
SARS-CoV-2 Orf9b 蛋白通过结合 Tom70.0.b 抑制免疫反应,从而抑制免疫反应. 对Orf9b的脂质结合会改变其结构,影响病毒免疫逃避策略.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
背景情况:
- 开放阅读框架9b (Orf9b) 是一种SARS-CoV和SARS-CoV-2蛋白质.
- Orf9b与线粒体受体Tom70 (外膜转位酶70) 相互作用.
- 这种相互作用对于抑制先天免疫系统,特别是1型干扰素反应至关重要.
研究的目的:
- 开发一种生物物理模型来量化Orf9b的结构变化和Tom70结合.
- 为了研究SARS-CoV-2变种的脂质结合和突变如何影响Orf9b:Tom70平衡.
- 了解Orf9b介导免疫抑制背后的分子机制.
主要方法:
- 生物物理建模以量化构造性切换和结合动力学.
- 对Orf9b同极体和Orf9b:Tom70复杂结构的分析.
- 对Orf9b单体的脂质结合作用的表征:二元平衡.
- 对Orf9b与Tom70.0.的相互作用引起关注的变异突变的评估.
主要成果:
- 开发了一种生物物理模型来描述Orf9b在同体和单体状态之间的结构转换.
- 脂质与Orf9b同分体的结合显著稳定了二分体形式,使解离率降低了约100倍.
- 关注SARS-CoV-2变异的突变可以改变特定的速率常数,而不会显著影响Tom70结合亲和力.
- 偶联平衡中的扰乱会影响Orf9b对Tom70.0.的明显亲和力.
结论:
- Orf9b的结构动力学和Tom70结合是其免疫抑制的关键.
- 脂质相互作用和病毒突变可以通过改变其平衡动态来调节Orf9b的功能.
- 了解这些分子机制,可以深入了解冠状病毒病原和干扰素信号调节的潜在治疗点.
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