Revisiting the putative TCR Cα dimerization model through structural analysis.

Revisiting the putative TCR Cα dimerization model through structural analysis.
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DOI:
10.3389/fimmu.2013.00016
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发表时间:
2013
影响因子:
7.3
通讯作者:
Reinherz EL
Reinherz EL
中科院分区:
医学2区
文献类型:
--
作者:
Wang JH;Reinherz EL

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尽管在T细胞受体(TCR)生物学和结构方面取得了重大进展,但肽-MHC复合物(pMHC)配体如何触发αβ TCR活化仍然没有得到解决。存在两种观点。一个模型假设单体TCR-pMHC连接事件是足够的,而第二个模型提出通过Cα结构域相互作用加上pMHC结合的TCR-TCR顺式二聚化是关键的。我们仔细检查了22个已知的TCR/pMHC复合物晶体结构,在这些晶体中没有发现任何预测的分子Cα-Cα接触,这将允许生理TCR二聚化。此外,Cα结构域外表面上保守聚糖加合物的存在排除了通过Cα结构域的假定TCR二聚化。观察到的Cα突变的功能后果可能是间接的,免疫突触处的TCR微簇由TCR跨膜/胞质相互作用通过信号分子、支架蛋白和/或细胞骨架元件驱动。
Despite major advances in T cell receptor (TCR) biology and structure, how peptide–MHC complex (pMHC) ligands trigger αβ TCR activation remains unresolved. Two views exist. One model postulates that monomeric TCR–pMHC ligation events are sufficient while a second proposes that TCR–TCR dimerization in cis via Cα domain interaction plus pMHC binding is critical. We scrutinized 22 known TCR/pMHC complex crystal structures, and did not find any predicted molecular Cα–Cα contacts in these crystals that would allow for physiological TCR dimerization. Moreover, the presence of conserved glycan adducts on the outer face of the Cα domain preclude the hypothesized TCR dimerization through the Cα domain. Observed functional consequences of Cα mutations are likely indirect, with TCR microclusters at the immunological synapse driven by TCR transmembrane/cytoplasmic interactions via signaling molecules, scaffold proteins, and/or cytoskeletal elements.
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