Endoplasmic reticulum aminopeptidase 1 (ERAP1) trims MHC class I-presented peptides in vivo and plays an important role in immunodominance
UMass Chan Affiliations
Department of PathologyDocument Type
Journal ArticlePublication Date
2006-06-07Keywords
Adoptive TransferAmino Acid Sequence
Aminopeptidases
Animals
CD8-Positive T-Lymphocytes
Cells, Cultured
Epitopes
Fibroblasts
*Genes, MHC Class I
Immune System
Mice
Mice, Inbred C57BL
Mice, Knockout
Peptides
Spleen
Viruses
Life Sciences
Medicine and Health Sciences
Metadata
Show full item recordAbstract
CD8(+) T cells respond to short peptides bound to MHC class I molecules. Although most antigenic proteins contain many sequences that could bind to MHC class I, few of these peptides actually stimulate CD8(+) T cell responses. Moreover, the T cell responses that are generated often follow a very reproducible hierarchy to different peptides for reasons that are poorly understood. We find that the loss of a single enzyme, endoplasmic reticulum aminopeptidase 1 (ERAP1), in the antigen-processing pathway results in a marked shift in the hierarchy of immunodominance in viral infections, even when the responding T cells have the same T cell receptor repertoire. In mice, ERAP1 is the major enzyme that trims precursor peptides in the endoplasmic reticulum and, in this process, can generate or destroy antigenic peptides. Consequently, when ERAP1 is lost, the immune response to some viral peptides is reduced, to others increased, and to yet others unchanged. Therefore, many epitopes must be initially generated as precursors that are normally trimmed by ERAP1 before binding to MHC class I, whereas others are normally degraded by ERAP1 to lengths that are too short to bind to MHC class I. Moreover, peptide trimming and the resulting abundance of peptide-MHC complexes are dominant factors in establishing immunodominance.Source
Proc Natl Acad Sci U S A. 2006 Jun 13;103(24):9202-7. Epub 2006 Jun 5. Link to article on publisher's site
DOI
10.1073/pnas.0603095103Permanent Link to this Item
http://hdl.handle.net/20.500.14038/38916PubMed ID
16754858Related Resources
ae974a485f413a2113503eed53cd6c53
10.1073/pnas.0603095103