Structural basis of the CD8 alpha beta/MHC class I interaction: focused recognition orients CD8 beta to a T cell proximal position.

Structural basis of the CD8 alpha beta/MHC class I interaction: focused recognition orients CD8 beta to a T cell proximal position.
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DOI:
10.4049/jimmunol.0901276
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发表时间:
2009-08-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Margulies DH
Margulies DH
中科院分区:
其他
文献类型:
--
作者:
Wang R;Natarajan K;Margulies DH

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在免疫系统中,B细胞、树突状细胞、NK细胞和T淋巴细胞都对通过配体结合受体和辅助受体而接收的信号作出反应。虽然T细胞识别的特异性是由T细胞受体与MHC/肽复合物的相互作用决定的,但胸腺中T细胞的发育及其对抗原的敏感性也依赖于辅助受体分子CD 8(对于MHCI)和CD 4(对于MHCII)。CD 8 αβ异源二聚体是T细胞活化的有效辅助受体,但由于忽视其与MHCI相互作用的结构细节,全面了解其功能的努力受到阻碍。在这里,我们描述了CD 8 αβ与鼠MHCI分子H-2Dd复合物的结构,分辨率为2.6 nm。CD 8 αβ相互作用的焦点是H-2Dd α3结构域的酸性环(残基222-228)。β亚基占据T细胞膜近端位置,定义了CD 8 α和CD 8 β亚基的相对位置。与CD 8 αα同源二聚体不同,CD 8 αβ不接触MHCIα2或β2-微球蛋白结构域。CD 8 α互补决定区-(CDR)2和CD 8 β CDR 1和CDR 2环的移动以及H-2Dd CD环的柔性促进单价相互作用。该结构解决了关于CD 8 αβ/MHCI相互作用的拓扑结构的不确定数据,表明CD 8 β在CD 8 αβ异二聚体的定向中至关重要,为理解CD 8 αβ在淋巴细胞信号传导中的机制作用提供了框架,并为设计用于肿瘤和病毒免疫治疗的结构改变的辅助受体提供了切实的背景。
In the immune system, B cells, dendritic cells, NK cells, and T lymphocytes all respond to signals received via ligand binding to receptors and coreceptors. While the specificity of T cell recognition is determined by interaction of T cell receptors with MHC/peptide complexes, the development of T cells in the thymus and their sensitivity to antigen are also dependent on coreceptor molecules CD8 (for MHCI) and CD4 (for MHCII). The CD8αβ heterodimer is a potent coreceptor for T cell activation, but efforts to understand its function fully have been hampered by ignorance of structural details of its interactions with MHCI. Here we describe the structure of CD8αβ in complex with the murine MHCI molecule H-2Dd at 2.6 Å resolution. The focus of the CD8αβ interaction is the acidic loop (residues 222-228) of the α3 domain of H-2Dd. The β subunit occupies a T cell membrane-proximal position, defining the relative positions of the CD8α and CD8β subunits. Unlike the CD8αα homodimer, CD8αβ does not contact MHCIα2 or β2-microglobulin domains. Movements of the CD8α complementarity determining region-(CDR) 2 and CD8β CDR1 and CDR2 loops as well as flexibility of the H-2Dd CD loop facilitate the monovalent interaction. The structure resolves inconclusive data on the topology of the CD8αβ/MHCI interaction, indicates that CD8β is crucial in orienting the CD8αβ heterodimer, provides a framework for understanding the mechanistic role of CD8αβ in lymphoid cell signaling, and offers a tangible context for design of structurally altered coreceptors for tumor and viral immunotherapy.
CD8BETA通过将T细胞受体/CD3与筏相关的CD8/p56(LCK)配合物耦合,使CD8具有有效的共感受器功能。
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影响因子: --
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