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Allelic differences in the relationship between proteasome activity and MHC class I peptide loading.

Benham, A.M.; Grommé, M.; Neefjes, J.

Authors

M. Grommé

J. Neefjes



Abstract

MHC class I molecules are cell surface glycoproteins that play a pivotal role in the response to intracellular pathogens. The loading of MHC class I molecules with antigenic substrates takes place in the endoplasmic reticulum. This requires a functional TAP transporter, which translocates peptides into the endoplasmic reticulum from the cytosol. The generation of antigenic peptides from polypeptide precursors is thought to be mediated in the cytosol by the proteasome. Previously, we have demonstrated that inhibiting the proteasome with the specific covalent inhibitor lactacystin results in a direct reduction of peptide-loaded MHC class I molecules. This indicates that the proteasome is the limiting step in the MHC class I pathway. In this study we use isoelectric focusing to demonstrate that two related MHC class I alleles, HLA-A3 and HLA-A11, as well as HLA-B35 do not follow this behavior. In contrast to other class I alleles expressed by the same cells, these alleles are loaded with peptides and mature normally when proteasome activity is severely inhibited. Our observations highlight a new level of diversity in the MHC class I system and indicate that there are allele-specific differences in the linkage between proteasome activity and MHC class I peptide loading.

Citation

Benham, A., Grommé, M., & Neefjes, J. (1998). Allelic differences in the relationship between proteasome activity and MHC class I peptide loading. The Journal of Immunology, 161(1), 83-89

Journal Article Type Article
Acceptance Date Jan 27, 1998
Online Publication Date Jul 1, 1998
Publication Date 1998-07
Journal Journal of Immunology
Print ISSN 0022-1767
Electronic ISSN 1550-6606
Publisher American Association of Immunologists
Peer Reviewed Peer Reviewed
Volume 161
Issue 1
Pages 83-89
Publisher URL http://www.jimmunol.org/content/161/1/83