The discriminatory power of the T cell receptor.

The discriminatory power of the T cell receptor.
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T细胞受体的歧视能力。

DOI:
10.7554/elife.67092
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发表时间:
2021-05-25
期刊:
影响因子:
7.7
通讯作者:
Dushek O
Dushek O
中科院分区:
生物学1区
文献类型:
--
作者:
Pettmann J;Huhn A;Abu Shah E;Kutuzov MA;Wilson DB;Dustin ML;Davis SJ;van der Merwe PA;Dushek O

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T细胞使用它们的T细胞受体(tcr)来区分在主要组织相容性复合体(pMHC)抗原上呈现的低亲和力的自身肽和高亲和力的非自身肽。尽管人们普遍认为TCR的歧视性权力近乎完美,但技术上的困难阻碍了对其进行精确量化的努力。在这里,我们描述了一种测量非常低的TCR/pMHC亲和力的方法,并用它来测量TCR的区分能力及其影响因素。我们发现,虽然与传统的细胞表面受体相比,TCR辨别能力增强,但并不完美:原代人T细胞对pMHC的反应亲和度低至KD ~ 1 mM。动力学校对机制符合我们的数据,提供了时间延迟(2.8 s)和生化步骤数(2.67)的首次估计,这与抗原识别的非凡敏感性一致。我们的研究结果解释了为什么自身pMHC经常诱导自身免疫性疾病和抗肿瘤反应,并提出了改变TCR歧视的方法。
T cells use their T cell receptors (TCRs) to discriminate between lower-affinity self and higher-affinity non-self peptides presented on major histocompatibility complex (pMHC) antigens. Although the discriminatory power of the TCR is widely believed to be near-perfect, technical difficulties have hampered efforts to precisely quantify it. Here, we describe a method for measuring very low TCR/pMHC affinities and use it to measure the discriminatory power of the TCR and the factors affecting it. We find that TCR discrimination, although enhanced compared with conventional cell-surface receptors, is imperfect: primary human T cells can respond to pMHC with affinities as low as KD ∼ 1 mM. The kinetic proofreading mechanism fit our data, providing the first estimates of both the time delay (2.8 s) and number of biochemical steps (2.67) that are consistent with the extraordinary sensitivity of antigen recognition. Our findings explain why self pMHC frequently induce autoimmune diseases and anti-tumour responses, and suggest ways to modify TCR discrimination.
DOI: 10.1016/j.molimm.2010.02.013
发表时间: 2010-05
影响因子: 3.6
作者:
Persaud SP;Donermeyer DL;Weber KS;Kranz DM;Allen PM
通讯作者: Allen PM
DOI: 10.4049/jimmunol.1003755
发表时间: 2011-05-01
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
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发表时间: 2009-07-15
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
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