Deconstructing the peptide-MHC specificity of T cell recognition.

Deconstructing the peptide-MHC specificity of T cell recognition.
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DOI:
10.1016/j.cell.2014.03.047
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发表时间:
2014-05-22
期刊:
影响因子:
64.5
通讯作者:
Garcia KC
Garcia KC
中科院分区:
生物学1区
文献类型:
--
作者:
Birnbaum ME;Mendoza JL;Sethi DK;Dong S;Glanville J;Dobbins J;Ozkan E;Davis MM;Wucherpfennig KW;Garcia KC

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为了调查其数量大大超过T细胞库的多样性的MHC呈递的肽抗原的范围,T细胞受体(TCR)被认为是交叉反应性的。然而,TCR交叉反应性的性质和程度尚未通过实验最终测量。我们开发了一个系统,以确定MHC提出的肽配体相结合的TCR选择的高度多样化的酵母展示的肽-MHC库与深度测序。虽然我们鉴定了数百种与五种不同的小鼠和人TCR中的每一种反应的肽,但所选肽具有与其已知抗原非常相似的TCR识别基序。TCR相互作用表面的这种结构保守性使我们能够利用深度测序信息来计算识别人类自身免疫性TCR的活化微生物和自身配体。本文所述的TCR交叉反应性的机制基础使得能够有效地监测不同的自身和外来抗原,但不需要非同源肽的简并识别。
In order to survey a universe of MHC-presented peptide antigens whose numbers greatly exceed the diversity of the T cell repertoire, T cell receptors (TCRs) are thought to be cross-reactive. However, the nature and extent of TCR cross-reactivity has not been conclusively measured experimentally. We developed a system to identify MHC-presented peptide ligands by combining TCR selection of highly diverse yeast-displayed peptide-MHC libraries with deep sequencing. While we identified hundreds of peptides reactive with each of five different mouse and human TCRs, the selected peptides possessed TCR recognition motifs that bore a close resemblance to their known antigens. This structural conservation of the TCR interaction surface allowed us to exploit deep sequencing information to computationally identify activating microbial and self-ligands for human autoimmune TCRs. The mechanistic basis of TCR cross-reactivity described here enables effective surveillance of diverse self and foreign antigens, but without necessitating degenerate recognition of non-homologous peptides.
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