The cytoplasmic tail of the T cell receptor CD3 epsilon subunit contains a phospholipid-binding motif that regulates T cell functions.
The cytoplasmic tail of the T cell receptor CD3 epsilon subunit contains a phospholipid-binding motif that regulates T cell functions.
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DOI:
10.4049/jimmunol.0900404
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发表时间:
2009-07-15
期刊:
影响因子:
--
通讯作者:
van Oers NS
中科院分区:
文献类型:
--
作者:
Deford-Watts LM;Tassin TC;Becker AM;Medeiros JJ;Albanesi JP;Love PE;Wülfing C;van Oers NS
The CD3 ε subunit of the TCR complex contains two defined signaling domains, a proline-rich sequence and an ITAM. We identified a third signaling sequence in CD3 ε, termed the basic-rich stretch (BRS). Herein, we show that the positively charged residues of the BRS enable this region of CD3 ε to complex a subset of acidic phospholipids, including PI(3)P, PI(4)P, PI(5)P, PI(3,4,5)P3, and PI(4,5)P2. Transgenic mice containing mutations of the BRS exhibited varying developmental defects, ranging from reduced thymic cellularity to a complete block in T cell development. Peripheral T cells from BRS-modified mice also exhibited several defects, including decreased TCR surface expression, reduced TCR-mediated signaling responses to agonist peptide-loaded APCs, and delayed CD3 ε localization to the immunological synapse. Overall, these findings demonstrate a functional role for the CD3 ε lipid-binding domain in T cell biology.
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