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• W2031057215 abstract "The HLA-B*4402 and B*4403 molecules differ only at residue 156, which borders the peptide binding site. Strong in vivo allogeneic reactions mediated by cytolytic T lymphocytes (CTLs) were reported in patients who received a bone marrow graft mismatched for these B44 subtypes, indicating that HLA-B*4402 and B*4403 molecules present distinct antigens. This could be due either to the presentation of different sets of antigenic peptides or to the recognition by CTLs of conformational epitopes formed by the MHC molecules alone or in association with antigenic peptides. To address this question, we compared the two B44 subtypes in their presentation to tumor-specific CTLs of three peptides, encoded by genes MAGE-3, MUM-1 and Tyrosinase. The peptides bound with similar affinities to B*4402 or B*4403 molecules, as assessed by lytic competition assays. One HLA-B*4402-restricted and one HLA-B*4403-restricted CTL clone were derived against each peptide. When tested for lysis of B*4402 and B*4403 cells incubated with the antigenic peptides, most CTLs showed a marked preference for one of the two B44 subtypes. Using variant peptides incorporating single alanine substitutions, we compared a given CTLs’ recognition of its antigenic peptide presented by both B44 subtypes. Some substitutions, which had no effect on the binding of the peptide, affected its recognition by the same CTL differently on B*4402 and B*4403 molecules. These results imply that the conformations adopted by the same peptide on the two HLA-B44 subtypes are different. We conclude that the B44 subtype specificity of T cells results mostly from distinct conformations adopted by the same peptides in the two B44 molecules. This does not exclude the possibility that in some cases the B44 subtype specificity results from the selective binding of a peptide to one subtype. We found several peptides, different from the three mentioned above, that contain the canonical HLA-B44 binding motif and bind to B*4403 but not to B*4402 molecules." @default.
• W2031057215 created "2016-06-24" @default.
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• W2031057215 date "1999-02-01" @default.
• W2031057215 modified "2023-10-03" @default.
• W2031057215 title "Differences in the recognition by CTL of peptides presented by the HLA-B*4402 and the HLA-B*4403 molecules which differ by a single amino acid" @default.
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• W2031057215 doi "https://doi.org/10.1034/j.1399-0039.1999.530201.x" @default.
• W2031057215 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10090611" @default.
• W2031057215 hasPublicationYear "1999" @default.
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