收费类受体2的微晶电子衍射结构 TIR-domain-nucleated MyD88 TIR-domain高阶组合的Toll-like受体2 TIR-domain-nucleated MyD88
Y Li1, L C Pacoste2, W Gu3
1Institute of Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia.
Acta crystallographica. Section D, Structural biology
|September 13, 2024
概括
托尔/互白素-1受体 (TIR) 域通过相互作用中介信号传递. 这项研究表明,托尔类受体2 (TLR2) TIR域核化MyD88 TIR组件,类似于MAL TIR域,揭示了一个保存的信号机制.
科学领域:
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
背景情况:
- 托尔/介质素-1受体 (TIR) 域是真核生物中至关重要的信号模块.
- 在哺乳动物中,TIR域通过托尔类受体 (TLR) 和适应蛋白调解促炎信号.
- 之前的研究表明,MAL TIR域核化了MyD88 TIR组装成晶体阵列.
研究的目的:
- 调查TLR2,TLR1和TLR6 TIR域在MyD88 TIR组件中的作用.
- 为了确定TLR2 TIR诱导的MyD88 TIR组件的高分辨率结构.
- 为了比较TLR2 TIR和MAL TIR诱导的MyD88 TIR组件之间的结构和形状差异.
主要方法:
- 微晶电子衍射 (MicroED) 用于确定MyD88 TIR组件的结构.
- 为了更高的分辨率和完整性,采用了改进的数据收集协议.
- 对信号相关区域 (BB循环,CD循环) 进行了合规分析.
主要成果:
- TLR2 TIR 域,但不是 TLR1 TIR 或 TLR6 TIR,在体外诱导了 MyD88 TIR 的更高阶晶体组合.
- 确定了TLR2 TIR诱导的MyD88 TIR微晶的高分辨率 (2.85 Å) 的MicroED结构.
- 与单体结构相比,TLR2 TIR 和 MAL TIR 诱导的 MyD88 TIR 组件在信号关键环中显示出构造差异.
结论:
- TLR2 TIR和MAL TIR与MyD88 TIR以类似的方式相互作用.
- 无论是TLR2 TIR还是MAL TIR,都单向核化MyD88 TIR组件,这表明在促炎信号中存在一种保存的机制.
- 对TIR域互动的结构洞察力为了解TLR信号通路提供了基础.
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