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Species-specific differences in proteasomal processing and tapasin-mediated loading influence peptide presentation by HLA-B27 in murine cells.

Laura Sesma·Iñaki Alvarez·Miguel Marcilla·Alberto Paradela·José A López de Castro
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Abstract

Expression of HLA-B27 in murine cells has been used to establish animal models for human spondyloarthritis and for antigen presentation studies, but the effects of xenogeneic HLA-B27 expression on peptide presentation are little known. The issue was addressed in this study. HLA-B27-bound peptide repertoires from human and murine cells overlapped by 75-85%, indicating that many endogenous HLA-B27 ligands are generated and presented in both species. Of 20 differentially presented peptides that were sequenced, only 40% arose from obvious inter-species protein polymorphism, suggesting that differences in antigen processing-loading accounted for many species-specific ligands. Digestion of synthetic substrates with human and murine 20 S proteasomes revealed cleavage differences that accounted for or correlated with differential expression of particular peptides. One HLA-B27 ligand found only in human cells was similarly generated in vitro by human and murine proteasomes. Differential presentation correlated with significantly decreased amounts of this ligand in human tapasin-deficient cells reconstituted with murine tapasin, indicating that species-specific interactions between HLA-B27, tapasin, and/or other proteins in the peptide-loading complex influenced presentation of this peptide. Our results indicate that differences in proteasomal specificity and in interactions involving tapasin determine differential processing and presentation of a significant number of HLA-B27 ligands in human and murine cells.

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Amino Acid SequenceAnimalsAntigen PresentationAntiportersCell LineCysteine EndopeptidasesHLA-B27 AntigenHumansImmunoglobulinsLigandsMembrane Transport ProteinsMiceMultienzyme ComplexesPeptidesProteasome Endopeptidase ComplexSequence HomologySpecies SpecificityTransfectionJournal ArticleResearch Support, Non-U.S. Gov't

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Laura Sesma, Iñaki Alvarez, Miguel Marcilla, Alberto Paradela, José A López de Castro. 2003-09-08. Species-specific differences in proteasomal processing and tapasin-mediated loading influence peptide presentation by HLA-B27 in murine cells.. https://doi.org/10.1074/jbc.m308816200

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