A single T cell receptor bound to major histocompatibility complex class I and class II glycoproteins reveals switchable TCR conformers.

A single T cell receptor bound to major histocompatibility complex class I and class II glycoproteins reveals switchable TCR conformers.
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DOI:
10.1016/j.immuni.2011.04.017
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发表时间:
2011-07-22
期刊:
影响因子:
32.4
通讯作者:
Kappler JW
Kappler JW
中科院分区:
医学1区
文献类型:
--
作者:
Yin L;Huseby E;Scott-Browne J;Rubtsova K;Pinilla C;Crawford F;Marrack P;Dai S;Kappler JW

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主要组织相容性复合体I类(MHCI)和MHCII蛋白在结构和序列上不同。为了了解T细胞受体(TCR)如何使用同一组可变区来结合这两种蛋白质,我们首次比较了与MHCI和MHCII配体结合的单个TCR。TCR在两种配体上采用相似的取向,其中TCR氨基酸被认为对于MHC相互作用是进化上保守的,占据MHCI和MHCII螺旋上的相似位置。然而,TCR抗原结合环在与每个配体相互作用时使用不同的构象。最重要的是,我们观察到交替TCR核心构象。当与MHCI结合而不是与MHCII结合时,Vα从Jα β链脱离,相对于Vβ转换Vα的位置。在其他几种结构中,Vα或Vβ都经历了同样的变化。因此,两个TCR V结构域可以在交替构象之间切换,可能扩展它们与不同MHC肽配体反应的能力。
Major histocompatibility complex class I (MHCI) and MHCII proteins differ in structure and sequence. To understand how T cell receptors (TCRs) can use the same set of variable regions to bind both proteins, we have presented the first comparison of a single TCR bound to both MHCI and MHCII ligands. The TCR adopts similar orientations on both ligands with TCR amino acids thought to be evolutionarily conserved for MHC interaction occupying similar positions on the MHCI and MHCII helices. However, the TCR antigen-binding loops use different conformations when interacting with each ligand. Most importantly, we observed alternate TCR core conformations. When bound to MHCI, but not MHCII, Vα disengages from the Jα β-strand, switching Vα’s position relative to Vβ. In several other structures either Vα or Vβ undergoes this same modification. Thus, both TCR V-domains can switch among alternate conformations, perhaps extending their ability to react with different MHC-peptide ligands.
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