Disparate epitopes mediating protective heterologous immunity to unrelated viruses share peptide-MHC structural features recognized by cross-reactive T cells.

Disparate epitopes mediating protective heterologous immunity to unrelated viruses share peptide-MHC structural features recognized by cross-reactive T cells.
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DOI:
10.4049/jimmunol.1300852
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发表时间:
2013-11-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Stern LJ
Stern LJ
中科院分区:
其他
文献类型:
--
作者:
Shen ZT;Nguyen TT;Daniels KA;Welsh RM;Stern LJ

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密切相关的肽表位可以被相同的T细胞识别,并有助于针对编码这些表位的病原体的免疫应答,但有时交叉反应性表位几乎没有同源性。交叉反应性T细胞受体识别这些不同配体所需的结构同源性程度仍不清楚。在这里,我们研究了不相关的和致病性病毒,淋巴细胞性脉络丛脑膜炎病毒(LCMV)和牛痘病毒(VV)的表位之间的交叉反应性T细胞反应的机制基础。我们的研究结果表明,LCMV交叉反应性T细胞对VV的反应是由一个共享的天冬酰胺残基,连同其他共享的结构元件保守的晶体结构的Kb-VV-A11 R和Kb-LCMV-GP 34。基于对交叉反应性T细胞应答的晶体结构和特异性决定因素的分析,我们能够操纵T细胞应答的交叉反应性程度,并预测和产生对空卵清蛋白衍生肽的变体的LCMV交叉反应性应答。这些结果表明,保护性异源免疫反应可以发生来自无关病毒的不同表位。
Closely related peptide epitopes can be recognized by the same T cells and contribute to the immune response against pathogens encoding those epitopes, but sometimes cross-reactive epitopes share little homology. The degree of structural homology required for such disparate ligands to be recognized by cross-reactive T cell receptors remains unclear. Here, we examined the mechanistic basis for cross-reactive T cell responses between epitopes from unrelated and pathogenic viruses, lymphocytic choriomeningitis virus (LCMV) and vaccinia virus (VV). Our results show that the LCMV-cross-reactive T cell response towards VV is dominated by a shared asparagine residue, together with other shared structural elements conserved in the crystal structures of Kb-VV-A11R and Kb-LCMV-GP34. Based on analysis of the crystal structures and the specificity determinants for the cross-reactive T cell response, we were able to manipulate the degree of cross-reactivity of the T cell response, and to predict and generate a LCMV-cross-reactive response towards a variant of a null ovalbumin-derived peptide. These results indicate that protective heterologous immune responses can occur for disparate epitopes from unrelated viruses.
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