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:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
van Oers NS
van Oers NS
中科院分区:
其他
文献类型:
--
作者:
Deford-Watts LM;Tassin TC;Becker AM;Medeiros JJ;Albanesi JP;Love PE;Wülfing C;van Oers NS

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TCR复合物的CD3 ε亚基包含两个确定的信号传导结构域,一个富含脯氨酸的序列和一个ITAM。我们确定了CD3 ε中的第三个信号序列,称为富碱段(BRS)。在本文中,我们表明BRS的带正电荷的残基使得CD3 ε的该区域能够复合酸性磷脂的子集,包括PI(3)P、PI(4)P、PI(5)P、PI(3,4,5)P3和PI(4,5)P2。含有BRS突变的转基因小鼠表现出不同的发育缺陷,从胸腺细胞减少到T细胞发育完全阻断。来自BRS修饰小鼠的外周T细胞也表现出几种缺陷,包括TCR表面表达降低,TCR介导的对激动剂肽负载的APC的信号传导应答降低,以及延迟的CD3 ε定位于免疫突触。总之,这些发现证明了CD3 ε脂质结合结构域在T细胞生物学中的功能作用。
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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