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
影响因子:
30.5
通讯作者:
Love PE
中科院分区:
文献类型:
--
作者:
Choi S;Warzecha C;Zvezdova E;Lee J;Argenty J;Lesourne R;Aravind L;Love PE
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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