Divergent T-cell receptor recognition modes of a HLA-I restricted extended tumour-associated peptide

Kok Fei Chan, Benjamin S. Gully, Stephanie Gras, Dennis X. Beringer, Lars Kjer-Nielsen, Jonathan Cebon, James McCluskey, Weisan Chen, Jamie Rossjohn

Research output: Contribution to journalArticleResearchpeer-review

8 Citations (Scopus)

Abstract

Human leukocyte antigen (HLA)-I molecules generally bind short peptides (8-10 amino acids), although extended HLA-I restricted peptides (>10 amino acids) can be presented to T cells. However, the function of such extended HLA-I epitopes in tumour immunity, and how they would be recognised by T-cell receptors (TCR) remains unclear. Here we show that the structures of two distinct TCRs (TRAV4+TRAJ21+-TRBV28+TRBJ2-3+ and TRAV4 + TRAJ8+-TRBV9+TRBJ2-1+), originating from a polyclonal T-cell repertoire, bind to HLA-B∗07:02, presenting a 13-amino-acid-long tumour-associated peptide, NY-ESO-160-72. Comparison of the structures reveals that the two TCRs differentially binds NY-ESO-160-72-HLA-B∗07:02 complex, and induces differing extent of conformational change of the NY-ESO-160-72 epitope. Accordingly, polyclonal TCR usage towards an extended HLA-I restricted tumour epitope translates to differing TCR recognition modes, whereby extensive flexibility at the TCR-pHLA-I interface engenders recognition.

Original languageEnglish
Article number1026
Number of pages13
JournalNature Communications
Volume9
Issue number1
DOIs
Publication statusPublished - 1 Dec 2018

Keywords

  • adaptive immunity
  • antigen processing and presentation
  • tumour immunology
  • x-ray crystallography

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