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Uba7的冷-EM结构揭示了ISG15激活和E1-E2转移的分子基础
Mohammad Afsar1, GuanQun Liu2, Lijia Jia1
1Department of Biochemistry & Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, TX, 78229, USA.
Nature communications
|August 8, 2023
概括
结构洞察力揭示了Uba7如何激活和转移ISG15到UBE2L6,这对先天免疫至关重要. 这些发现揭示了ISG15结合的分子机制,影响抗病毒反应和细胞信号通路.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 免疫学 免疫学 免疫学
背景情况:
- 干扰素刺激的15基因 (ISG15) 对于天生的免疫力至关重要,调节抗病毒活性,信号转导,亡和自.
- ISG15的结合需要一个E1酶 (Uba7) 和一个E2酶 (UBE2L6),但由于缺乏结构数据,Uba7功能的分子基础是未知的.
研究的目的:
- 阐明ISG15激活和由Uba7转移到UBE2L6.6的分子机制.
- 确定Uba7对ISG15和UBE2L6.6的特异性的结构基础.
主要方法:
- 电子显微镜 (cryo-EM) 用于确定人类Uba7复合体的高分辨率结构.
- 生物化学分析验证酶活性和特异性.
- 基于人类细胞的实验,以评估功能相关性.
主要成果:
- 呈现了人类Uba7的冷-EM结构,其中包括UBE2L6,ISG15腺酸和ISG15酸中间体.
- 揭示了一种独特的复杂结构,与泛奎素结合路径不同,特别是ISG15二中介的位置.
- 阐明了Uba7的催化活动的分子基础及其对ISG15和UBE2L6.6的特定识别.
结论:
- 这项研究为Uba7-UBE2L6-ISG15结合系统提供了重要的结构和功能见解.
- 这些发现有助于我们更好地理解ISG15在先天免疫和细胞过程中的作用.
- 这些数据为进一步研究ISG15相关途径和潜在治疗点提供了基础.
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