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:
影响因子:
--
通讯作者:
Stern LJ
中科院分区:
文献类型:
--
作者:
Shen ZT;Nguyen TT;Daniels KA;Welsh RM;Stern LJ
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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DOI:
10.4049/jimmunol.1003150
发表时间:
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期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
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发表时间:
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期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
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