An HLA-A2-restricted T-cell epitope mapped to the BNLF2a immune evasion protein of Epstein-Barr virus that inhibits TAP

J Virol. 2009 Mar;83(6):2783-8. doi: 10.1128/JVI.01724-08. Epub 2009 Jan 7.

Abstract

The early lytic cycle protein of Epstein-Barr virus (EBV), BNLF2a, has recently been shown to play a critical role in immune evasion by inhibiting the peptide transporter associated with antigen processing (TAP), thereby blocking antigen-specific CD8(+) T-cell recognition of many lytic cycle antigens. Surprisingly, we now show that a peptide ((50)VLFGLLCLL(58)) from the hydrophobic C-terminal region of this small (60-amino-acid) EBV protein is efficiently presented by the common class I allele HLA-A2 for recognition by cytotoxic T lymphocytes. The mechanism for this unexpected finding was revealed by experiments showing that this epitope is processed and presented independently of TAP.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antigen Presentation
  • Epitopes, T-Lymphocyte / immunology*
  • HLA-A2 Antigen / immunology
  • Herpesvirus 4, Human / immunology*
  • Protein Structure, Tertiary
  • T-Lymphocytes, Cytotoxic / immunology
  • Viral Matrix Proteins / immunology*

Substances

  • BNLF21 protein, human herpesvirus 4
  • Epitopes, T-Lymphocyte
  • HLA-A2 Antigen
  • Viral Matrix Proteins