人类呼吸道同胞病毒转录调节器NS1与MED25相互作用的分子基础
Parismita Kalita1, Oam Khatavkar2, Grace Uwase2
1Department of Medicine, Washington University School of Medicine, St. Louis, MO, USA.
Nature communications
|March 25, 2025
概括
人类呼吸道同胞病毒NS1蛋白与MED25结合,调节宿主基因. 这种涉及ATF3的相互作用揭示了病毒在感染期间操纵宿主转录的策略.
科学领域:
- 分子生物学分子生物学
- 病毒学 病毒学
- 结构生物学是结构生物学.
背景情况:
- 调解者复合体对于基因转录至关重要,包括在病毒感染期间.
- 病毒蛋白经常准介质子单元来操纵宿主基因表达.
- MED25是一种已知被病毒激活剂准的中介子单元.
研究的目的:
- 阐明人类呼吸道同胞性病毒 (hRSV) 非结构性1 (NS1) 蛋白与MED25相互作用的分子机制.
- 了解hRSV NS1如何调节宿主基因转录.
主要方法:
- 进行X射线晶体学以确定NS1-MED25复合体的结构.
- 染色体免疫沉降测序 (ChIP-seq) 用于识别转录因子的结合.
- RNA测序 (RNA-seq) 用于分析宿主基因表达变化.
主要成果:
- 晶体结构显示,hRSV NS1与MED25激活器相互作用域 (ACID) 的两面结合.
- 与其他病毒激活剂相比,这种NS1-MED25相互作用在结构上是独一无二的.
- ChIP-seq和RNA-seq确定了ATF3转录因子,并将NS1/Mediator/ATF3复合体与hRSV感染期间宿主基因调节有关.
- 数据表明,病毒转录调节器在"模糊"接口上的形状灵活性.
结论:
- 这项研究为hRSV NS1介导的宿主基因转录调节提供了分子基础.
- 病毒利用转录激活器接口的结构灵活性来控制宿主基因表达.
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