在高度可变的生殖线编码区域之间保持的生物物理兼容性塑造了TCR-MHC相互作用
Christopher T Boughter1, Martin Meier-Schellersheim1
1Computational Biology Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, United States.
eLife
|October 20, 2023
概括
与-MHC复合体的T细胞受体 (TCR) 相互作用对于适应性免疫至关重要. 这项研究全面分析了生殖系编码的接触,揭示了生物物理兼容性,而不是序列保存,可能决定了结合性方向.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 计算生物学 计算生物学
背景情况:
- T细胞是适应性免疫的关键参与者,通过与-MHC (pMHC) 复合体相互作用的T细胞受体 (TCR) 识别病原体.
- TCR-pMHC复合体的形成涉及生殖系编码和超变氨基酸,生殖系相互作用可能被广泛共享.
- 之前的实验研究只探索了广的TCR-pMHC相互作用空间的有限部分.
研究的目的:
- 对人类所有可能的生殖系编码的TCR-MHC接触者进行全面的计算分析.
- 描述这些在很大程度上是抗原独立的相互作用,并了解它们在TCR-pMHC复合体形成中的作用.
- 研究控制TCR-pMHC结合的特异性和动态的因素.
主要方法:
- 利用计算分析来检查所有潜在的生殖系编码的TCR-MHC接触.
- 评估了跨生殖系编码区域的序列保护,特别是TCR CDR1和CDR2循环和MHC分子.
- 研究了生物物理兼容性在定义TCR-pMHC复合体形成和对接方向方面的作用.
主要成果:
- 确定在生殖系编码的TCR-MHC相互作用中,序列级保存是罕见的.
- 在TCR CDR1和CDR2循环中发现的高氨基酸多样性有助于序列保存的稀有性.
- 提出TCR循环与MHC表面之间的生物物理兼容性,而不是序列保存,可能决定像对接方向这样的结合性质.
结论:
- 生殖系编码的TCR-MHC相互作用在序列水平上比以前假设的要少得多.
- TCR-pMHC结合接口的动态性质很可能受生物物理兼容性原则的约束.
- 这种全面的分析为T细胞识别和适应性免疫的基本机制提供了新的见解.
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