T cell receptor cross-reactivity expanded by dramatic peptide-MHC adaptability.

T cell receptor cross-reactivity expanded by dramatic peptide-MHC adaptability.
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DOI:
10.1038/s41589-018-0130-4
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发表时间:
2018-10
影响因子:
14.8
通讯作者:
Baker BM
Baker BM
中科院分区:
生物学1区
文献类型:
--
作者:
Riley TP;Hellman LM;Gee MH;Mendoza JL;Alonso JA;Foley KC;Nishimura MI;Vander Kooi CW;Garcia KC;Baker BM

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T细胞受体交叉反应性允许固定的T细胞库对更大范围的潜在抗原作出反应。最近的工作强调了肽结构和化学同源性的重要性,而不是序列相似性,在T细胞受体的交叉反应性。令人惊讶的是,T细胞受体也可以在几乎没有生理化学共性的配体之间发生交叉反应。研究临床相关的受体DMF5,我们表明,交叉识别这种不同的抗原可以发生通过机制,涉及迄今为止未预料到的重排肽和提出的MHC蛋白,包括结合诱导的肽寄存器移位和延伸的MHC肽结合槽。此外,即使这种戏剧性的重排没有转化为结构或化学分子模拟,交叉反应性也可以进行。除了证明T细胞受体交叉反应性的新原理外,我们的研究结果还对预测和控制T细胞特异性和交叉反应性的努力产生了影响,并突出了与预测T细胞反应性相关的挑战。
T cell receptor cross-reactivity allows a fixed T cell repertoire to respond to a much larger universe of potential antigens. Recent work has emphasized the importance of peptide structural and chemical homology, as opposed to sequence similarity, in T cell receptor cross-reactivity. Surprisingly though, T cell receptors can also cross-react between ligands with little physiochemical commonalities. Studying the clinically relevant receptor DMF5, we demonstrate that cross-recognition of such divergent antigens can occur through mechanisms that involve heretofore unanticipated rearrangements in the peptide and presenting MHC protein, including binding-induced peptide register shifts and extensions from MHC peptide binding grooves. Moreover, cross-reactivity can proceed even when such dramatic rearrangements do not translate into structural or chemical molecular mimicry. Beyond demonstrating new principles of T cell receptor cross-reactivity, our results have implications for efforts to predict and control T cell specificity and cross-reactivity, and highlight challenges associated with predicting T cell reactivities.
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