1sje Citations

A hairpin turn in a class II MHC-bound peptide orients residues outside the binding groove for T cell recognition.

Proc. Natl. Acad. Sci. U.S.A. 101 13279-84 (2004)
Cited: 33 times
EuropePMC logo PMID: 15331779

Abstract

T cells generally recognize peptide antigens bound to MHC proteins through contacts with residues found within or immediately flanking the seven- to nine-residue sequence accommodated in the MHC peptide-binding groove. However, some T cells require peptide residues outside this region for activation, the structural basis for which is unknown. Here, we have investigated a HIV Gag-specific T cell clone that requires an unusually long peptide antigen for activation. The crystal structure of a minimally antigenic 16-mer bound to HLA-DR1 shows that the peptide C-terminal region bends sharply into a hairpin turn as it exits the binding site, orienting peptide residues outside the MHC-binding region in position to interact with a T cell receptor. Peptide truncation and substitution studies show that both the hairpin turn and the extreme C-terminal residues are required for T cell activation. These results demonstrate a previously unrecognized mode of MHC-peptide-T cell receptor interaction.

Articles - 1sje mentioned but not cited (5)



Reviews citing this publication (4)

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  16. Folding of an MHC class II-restricted tumor antigen controls its antigenicity via MHC-guided processing. Mimura Y, Mimura-Kimura Y, Doores K, Golgher D, Davis BG, Dwek RA, Rudd PM, Elliott T. Proc. Natl. Acad. Sci. U.S.A. 104 5983-5988 (2007)
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