通过HLA-DR4呈现的T细胞受体识别鲁林化田素-C的分子基础
Hien Thy Dao1, Tiing Jen Loh1, Ravi K Sharma2
1Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Australia.
The Journal of biological chemistry
|June 4, 2025
概括
类风湿性关节炎 (RA) 涉及T细胞对素化表位体的自主反应. 这项研究揭示了T细胞受体 (TCR) 如何识别氨酸素-C (TNC) 和其特定的结合因子,从而提供了对RA病变的洞察力.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 类风湿病学 类风湿病学
背景情况:
- 类风湿性关节炎 (RA) 的发病与CD4+T细胞对由HLA-DRB1分子呈现的素化 (cit) 自体表位素的自主反应有关.
- 虽然T细胞受体 (TCRs) 识别了一些素化表位,但识别其他素化表位的分子基础,如素-C (TNC),仍然不清楚.
- 替代性素化位置对T细胞识别的影响也尚未完全阐明.
研究的目的:
- 为了研究TCRs,HLA-DRB1*04:01和具有双重素化的素化TNC (TNC1014,1016cit) 之间的分子相互作用.
- 了解跨国公司中特定的素化位置如何影响TCR识别和特异性.
- 在RA的背景下,提供分子洞察力,了解鲁林化在调节TCR识别中的作用.
主要方法:
- 在2.4 Å分辨率下确定了HLA-DRB1*04:01与TNC (1014,1016cit) 复合的晶体结构.
- 确定了类风湿性关节炎患者衍生的TCR (TRAV35+/TRBV10-2+) 结合HLA-DRB1*04:01TNC1014,1016cit的结晶结构,分辨率为3.2 Å.
- 使用了表面等离子体共振,四聚体染色和CD69激活试验来评估TCR结合和反应性.
主要成果:
- 晶体结构显示了HLA-DRB1*04:01TNC1014,1016cit的保存结合寄存器,两种素线都向上突出.
- TCR的CDR3α循环采用了二次螺旋形状,允许与TNC的P-1和P2基线进行广泛的相互作用.
- 研究的TCR对TNC1014,1016cit表现出严格的特异性,P-1-Cit,P2-Cit和P5-Tyr被确定为关键决定因素,并且没有与其他RA自身抗原交叉反应.
结论:
- 该研究提供了详细的分子洞察力,了解TCR如何在HLA-DRB1*04:01.的背景下识别素化表位体,特别是TNC.
- 这些发现凸显了素化位置和特定氨基酸残留在决定TCR特异性的关键作用.
- 这项工作有助于了解T细胞在类风湿性关节炎中自动反应的基础分子机制.
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