THEMIS enhances TCR signaling and enables positive selection by selective inhibition of the phosphatase SHP-1.

THEMIS enhances TCR signaling and enables positive selection by selective inhibition of the phosphatase SHP-1.
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DOI:
10.1038/ni.3692
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发表时间:
2017-04
期刊:
影响因子:
30.5
通讯作者:
Love PE
Love PE
中科院分区:
医学1区
文献类型:
--
作者:
Choi S;Warzecha C;Zvezdova E;Lee J;Argenty J;Lesourne R;Aravind L;Love PE

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Themis是一种T细胞特异性蛋白,在CD4+CD8+胸腺细胞中高表达,在阳性选择和T细胞发育中起着至关重要的作用。Themis缺乏明确的催化结构域,但包含一个功能未知的独特(CABIT)模块的两个串联重复序列。在这里,我们发现THEMIS直接调节蛋白酪氨酸磷酸酶SHP-1的催化活性。这一作用是由CABIT模块介导的,CABIT模块与SHP-1磷酸酶结构域结合,促进或稳定SHP-1催化半胱氨酸的氧化,抑制SHP-1酪氨酸磷酸酶活性。SHP-1的降低减轻了−/−胸腺细胞的发育障碍。因此,THEMIS通过增强T细胞抗原受体对低亲和力配体的信号反应,促进胸腺细胞阳性选择。
THEMIS, a T cell specific protein that is highly expressed in CD4+CD8+ thymocytes, has a crucial role in positive selection and T cell development. THEMIS lacks defined catalytic domains but contains two tandem repeats of a distinctive (CABIT) module of unknown function. Here, we show that THEMIS directly regulated the catalytic activity of the protein tyrosine phosphatase SHP-1. This action was mediated by the CABIT modules, which bound to the SHP-1 phosphatase domain and promoted or stabilized oxidation of the SHP-1 catalytic cysteine, inhibiting SHP-1 tyrosine phosphatase activity. Reduction of SHP-1 alleviated the developmental block in Themis−/− thymocytes. Thus, THEMIS facilitates thymocyte positive selection by enhancing the T cell antigen receptor signaling response to low affinity ligands.
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