αβ T cell receptors that do not undergo major histocompatibility complex-specific thymic selection possess antibody-like recognition specificities.

αβ T cell receptors that do not undergo major histocompatibility complex-specific thymic selection possess antibody-like recognition specificities.
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不经历主要组织相容性复合体特异性胸腺选择的αβT细胞受体具有抗体样识别特异性。

DOI:
10.1016/j.immuni.2011.11.013
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发表时间:
2012-01-27
期刊:
影响因子:
32.4
通讯作者:
Singer A
Singer A
中科院分区:
医学1区
文献类型:
--
作者:
Tikhonova AN;Van Laethem F;Hanada K;Lu J;Pobezinsky LA;Hong C;Guinter TI;Jeurling SK;Bernhardt G;Park JH;Yang JC;Sun PD;Singer A

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主要组织相容性复合体(MHC)限制是T细胞抗原识别的主要特征,并且被认为是αβ T细胞受体(TCR)结构固有的,因为种系编码的残基施加MHC特异性。在这里,我们分析了来自未经历MHC特异性胸腺选择的T细胞的TCR。这里研究的两种αβ TCR在识别天然自身蛋白CD 155上的糖基化依赖性构象表位方面类似于抗体,而不是识别肽-MHC复合物,并且它们以独立于MHC分子的高亲和力这样做。配体识别是通过αβTCR结合位点进行的,并且涉及相同的种系编码残基,这些残基被认为是唯一施加MHC特异性的,这表明这些残基不仅促进MHC结合。因此,这项研究表明,在没有MHC特异性胸腺选择的情况下,αβ TCR在识别MHC非依赖性配体上的构象表位方面可以类似于抗体。
Major histocompatibility complex (MHC)-restriction is the cardinal feature of T cell antigen recognition and is thought to be intrinsic to αβ T cell receptor (TCR) structure because of germline-encoded residues which impose MHC specificity. Here, we analyzed TCRs from T cells that had not undergone MHC-specific thymic selection. Instead of recognizing peptide-MHC complexes, the two αβTCRs studied here resembled antibodies in recognizing glycosylation-dependent conformational epitopes on a native self-protein, CD155, and they did so with high affinity independently of MHC molecules. Ligand recognition was via the αβTCR combining site and involved the identical germline-encoded residues that have been thought to uniquely impose MHC specificity, demonstrating that these residues do not only promote MHC binding. Thus, this study demonstrates that, without MHC-specific thymic selection, αβTCRs can resemble antibodies in recognizing conformational epitopes on MHC-independent ligands.
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