Relationship between peptide selectivities of human transporters associated with antigen processing and HLA class I molecules

Soizic Daniel, Vladimir Brusic, Sophie Caillat-Zucman, Nicolai Petrovsky, Leonard Harrison, Daniela Riganelli, Francesco Sinigaglia, Fabio Gallazzi, Jürgen Hammer, Peter M. Van Endert

Research output: Journal PublicationArticlepeer-review

94 Citations (Scopus)


Efficiency of presentation of a peptide epitope by a MHC class I molecule depends on two parameters: its binding to the MHC molecule and its generation by intracellular Ag processing. In contrast to the former parameter, the mechanisms underlying peptide selection in Ag processing are poorly understood. Peptide translocation by the TAP transporter is required for presentation of most epitopes and may modulate peptide supply to MHC class I molecules. To study the role of human TAP for peptide presentation by individual HLA class I molecules, we generated artificial neural networks capable of predicting the affinity of TAP for random sequence 9-mer peptides. Using neural network-based predictions of TAP affinity, we found that peptides eluted from three different HLA class I molecules had higher TAP affinities than control peptides with equal binding affinities for the same HLA class I molecules, suggesting that human TAP may contribute to epitope selection. In simulated TAP binding experiments with 408 HLA class I binding peptides, HLA class I molecules differed significantly wit respect to TAP affinities of their ligands. As a result, some class I molecules, especially HLA-B27, may be particularly efficient in presentation of cytosolic peptides with low concentrations, while most class I molecules may predominantly present abundant cytosolic peptides.

Original languageEnglish
Pages (from-to)617-624
Number of pages8
JournalJournal of Immunology
Issue number2
Publication statusPublished - 15 Jul 1998
Externally publishedYes

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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