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在T细胞受体中可塑性的结构基础是识别自我-MHC抗原的受体
K C Garcia1, M Degano, L R Pease
1Department of Molecular Biology and the Skaggs Institute of Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
T细胞受体 (TCRs) 通过经历形状变化来识别多种自我和外来抗原来表现出双重特异性. 这种结构可塑性允许TCR扫描-MHC复合体以检测病原体.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 分子生物学分子生物学
背景情况:
- T细胞受体 (TCRs) 对于适应性免疫至关重要,调解自我耐受性和病原体识别.
- TCRs固有的双重特异性允许它们与自身和外来抗原相互作用,这种现象在分子层面上尚不完全理解.
研究的目的:
- 使用结构和生物物理方法阐明TCR交叉反应的分子基础.
- 了解TCRs如何实现可塑性,以结合多种类型的质主要基因相容复合体 (pMHC) 抗原.
主要方法:
- 使用X射线晶体学来确定与自我-MHC复合体结合的全活性TCR的结构.
- 在3.0安格斯特罗姆分辨率下对晶体结构的分析为TCR--MHC接口和形状变化提供了洞察力.
主要成果:
- 晶体结构显示了-TCR接口的形状互补性差,TCRβ链CDR3与的相互作用最小.
- 在结合时,在三个TCR CDR循环中观察到显著的形状变化,表明结构可塑性.
- 广泛的TCR与pMHCα螺旋体的相互作用表明,TCR Valpha域介导的通用结合方向.
结论:
- 由于CDR循环的形状变化导致的TCR结构性可塑性,可以识别多种类型的抗原.
- 与pMHCα螺旋体之间的Valpha域介导相互作用促进了用于抗原歧视的扫描机制.
- 这种分子理解为免疫监测中T细胞受体的双重特异性提供了基础.
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