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一个基于DNA的T细胞受体揭示了受体聚合在连接体区分中的作用

Marcus J Taylor¹, Kabir Husain², Zev J Gartner³

¹Department of Cellular and Molecular Pharmacology, University of California San Francisco, San Francisco, CA 94143, USA; National Centre for Biological Sciences, Bangalore 560065, India; HHMI Summer Institute, Woods Hole, MA 02543, USA.

|March 25, 2017

概括

使用T细胞受体 (TCR) 的结合强度来检测威胁. 这项研究表明,T细胞通过形成受体集群来区分配体,这一过程取决于结合时间,从而增强信号输出.

科学领域:

免疫学
分子生物学
生物物理

背景情况:

通过感知T细胞受体 (TCR) 与-MHC复合体的结合亲和力,T细胞启动免疫反应.
没有完全理解T细胞将细胞外TCR- pMHC相互作用时间转化为细胞内信号的机制.

研究的目的:

研究T细胞如何区分连体结合强度.
阐明受体聚合在T细胞信号传递中的作用.

主要方法:

使用DNA杂交来模仿TCR-pMHC相互作用的合成信号系统的开发.
用单分子成像来观察受体动态.
分析信号通路的计算建模.

主要成果:

T细胞可以通过单个基对区分DNA连体.
通过结合受体的集群来启动受体的歧视.
受体聚类是一个时间依赖的过程,需要更长的连接物结合时间.
计算模型显示受体聚类作为动力校对,放大来自较长结合体的信号.

结论:

通过聚类对T细胞受体的空间重组对于配体的区分至关重要.
受体聚合提供了T细胞信号的动态校对机制,增强了对结合时间的敏感性.

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