使用蛋白质聚合物工程辅助原生质谱学解读聚比奎丁链与酶激活和招募域之间的相互作用机制
Bin Song1, Qingrong Chen2, Rongrong Dai2
1Shanghai Institute of Virology, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
Analytical chemistry
|September 13, 2025
概括
聚比奎丁链的长度和拓对于天生的免疫信号传递至关重要. 这项研究揭示了特定的聚比基链长度如何稳定抗病毒信号复合体,为细胞信号传导机制提供了洞察力.
科学领域:
- 生物化学和分子生物学
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
背景情况:
- 聚比奎丁 (polyUb) 链的拓结构决定了蛋白质构成和细胞信号传递.
- 由于原生链异质性,对多链的构造动态和拓学知之甚少.
- 与lys63 (K63) 结合的多比基链是先天免疫信号通路的关键调节者.
研究的目的:
- 为了研究K63-链接的多比基链的结构动力学和信号机制.
- 描述用于结合和稳定抗病毒信号复合体所需的最小聚比基链长度.
- 阐明聚比基链长度和石化计在调节先天免疫反应中的作用.
主要方法:
- 合成K63链接特定的聚比奎丁链梯.
- 原生质谱仪用于分析聚比奎链形状和复杂形成.
- 使用RNA传感器RIG-I,MDA5及其适配器MAVS进行复杂化研究.
主要成果:
- 观察到不同长度的聚比基链在单体,二体和三体状态中具有不同的构造.
- 至少有6个 (Ub6) 和11个 (Ub11) 的乌比奎单元被确定为稳定RIG-I和MDA5 CARD复合体所必需的,分别在1:4的静脉测量上.
- 组装了超过九层MAVS CARD丝的宏分子复合体,由K63-多比基因链调节.
结论:
- 聚比基链长度和固态度是抗病毒信号复合体组合和稳定性的关键决定因素.
- 特定的聚比基链长度可以精确调节信号复合物的形成,从而影响先天免疫力.
- 这项研究提供了分子层面的理解,如何聚比基链动态控制细胞信号转导在先天免疫.
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