Preferential binding of unusually long peptides to MHC class I and its influence on the selection of target peptides for T cell recognition.

A classic feature of antigen presentation for CD8+ T cell recognition is that MHC class I molecules generally present peptides of 8-10 amino acids in length. However, recent studies have demonstrated that peptides of >10 residues play a significant role in immune surveillance by T cells restricted by some HLA class I alleles. In the present study, we describe several examples of unusually long viral peptides of 11 or 12 residues, recognized by CTLs in the context of HLA-B35. Interestingly, all these immunogenic peptides completely encompass shorter canonical length sequences that conform to the HLA-B35 binding motif, but which fail to stimulate detectable T cell responses. The mechanism for this phenomenon appears to involve the preferential binding to HLA-B35 of the atypically long CD8+ T cell target peptides over the overlapping canonical length sequences. These data suggest that the peptide length specificity of some HLA class I alleles is broad, allowing peptides of >10 residues to sometimes dominate over canonical length class I ligands as targets for T cell recognition.

• Publication year

  2008

• Venue

  Molecular Immunology

• Publication date

  2008-03-01

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1016/J.MOLIMM.2007.09.026PMID 17981331
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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