Lck promotes Zap70-dependent LAT phosphorylation by bridging Zap70 to LAT.

Lck promotes Zap70-dependent LAT phosphorylation by bridging Zap70 to LAT.
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DOI:
10.1038/s41590-018-0131-1
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发表时间:
2018-07
期刊:
影响因子:
30.5
通讯作者:
Weiss A
Weiss A
中科院分区:
医学1区
文献类型:
--
作者:
Lo WL;Shah NH;Ahsan N;Horkova V;Stepanek O;Salomon AR;Kuriyan J;Weiss A

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T细胞抗原受体(TCR)信号传导需要激酶Lck和Zap70的连续活性。在TCR刺激后,Lck使TCR磷酸化,导致Zap70的募集、磷酸化和活化。Lck使用其SH2结构域结合并稳定磷酸化Zap70,Zap70磷酸化协调下游信号传导的关键衔接子LAT和SLP76。目前还不清楚这些衔接子的磷酸化是通过被动扩散还是主动募集发生的。我们报告发现了一个保守的脯氨酸丰富的基序在LAT介导有效的LAT磷酸化。Lck通过其SH3结构域与该基序结合,并通过其SH2结构域与磷酸化Zap70结合,从而充当分子桥梁以促进Zap70和LAT的共定位。这种富含脯氨酸的基序的消除损害了TCR信号传导和T细胞发育。这些结果证明了Lck的显著的多功能性,其中其每个结构域已经进化为在TCR信号传导中协调不同的步骤。
T cell antigen receptor (TCR) signaling requires the sequential activities of the kinases Lck and Zap70. Upon TCR stimulation, Lck phosphorylates the TCR, leading to the recruitment, phosphorylation, and activation of Zap70. Lck binds to and stabilizes phosho-Zap70 using its SH2 domain, and Zap70 phosphorylates the critical adaptors LAT and SLP76, which coordinate downstream signaling. It is unclear whether phosphorylation of these adaptors happens through passive diffusion or active recruitment. We report the discovery of a conserved proline-rich motif in LAT that mediated efficient LAT phosphorylation. Lck associated with this motif via its SH3 domain, and with phospho-Zap70 via its SH2 domain, thereby acting as molecular bridge to facilitate the co-localization of Zap70 and LAT. Elimination of this proline-rich motif compromised TCR signaling and T cell development. These results demonstrate the remarkable multi-functionality of Lck, where each of its domains has evolved to orchestrate a distinct step in TCR signaling.
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