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The Journal of Immunology, Vol 157, Issue 10 4464-4473, Copyright © 1996 by American Association of Immunologists
ARTICLES |
S Malarkannan, F Gonzalez, V Nguyen, G Adair and N Shastri
Department of Molecular and Cell Biology, University of California, Berkeley 94720, USA.
The identity and abundance of self-peptide/MHC class I complexes that serve as ligands for alloreactive T cells remain largely unknown. Using the Kb-restricted, alloreactive T cells as a probe, the Ag precursor gene, adenosine phosphoribosyl transferase (APRT), was isolated by expression cloning. Its naturally processed product was identified as the SLVELTSL (SEL8) octapeptide. The SEL8 peptide shared five residues with the previously identified SVVEFSSL (JAL8) peptide that stimulated the same T cell, but lacked the critical phenylalanine/tyrosine residue at the primary p5 anchor position. Despite the absence of this key conserved anchor residue, SEL8 was bound tightly by Kb MHC and yet was expressed at less than 10 copies/cell. Mutations in the donor APRT gene in the APC caused a concomitant loss in the ability of APCs to stimulate T cells. The results confirm that the display of peptide/MHC complexes in cells exceeds the predictions based upon consensus motifs, and that CD8+ alloreactive and conventional Ag-specific T cells are indistinguishable in their ability to recognize unique and rare peptide/MHC class I complexes.
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