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• W2043485104 abstract "Peptide fragments of self-proteins bound to major histocompatibility complex molecules within the thymus are important for positively selecting T cell receptor (TCR)-bearing CD4+CD8+ double positive (DP) thymocytes for further maturation. The relationship between naturally processed thymic self-peptides and TCR-specific cognate peptides is unknown. Here we employ HPLC purification of peptides released from H-2Kb molecules of the C57BL/6 thymus in conjunction with mass spectrometry (MS) and functional profiling to identify a naturally processed Kb-bound peptide positively selecting the N15 TCR specific for the vesicular stomatitis virus octapeptide (VSV8) bound to Kb. The selecting peptide was identified in 1 of 80 HPLC fractions and shown by tandem MS (MS/MS) sequencing to correspond to residues 68–75 of the MLRQ subunit of the widely expressed mitochondrial NADH ubiquinone oxidoreductase (NUbO68–75). Of note, the peptide differs at six of its eight residues from the cognate peptide VSV8 and functions as a weak agonist for mature CD8 single positive (SP) N15 T cells, with activity 10,000-fold less than VSV8. In N15 transgenic (tg) recombinase activating gene 2−/− transporter associated with antigen processing 1−/− fetal thymic organ culture, NUbO68–75 induces phenotypic and functional differentiation of N15 TCR bearing CD8 SP thymocytes. Failure of NUbO68–75 to support differentiation of a second Kb-restricted TCR indicates that its inductive effects are not general." @default.
• W2043485104 created "2016-06-24" @default.
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• W2043485104 date "2001-09-24" @default.
• W2043485104 modified "2023-10-18" @default.
• W2043485104 title "A Naturally Processed Mitochondrial Self-Peptide in Complex with Thymic Mhc Molecules Functions as a Selecting Ligand for a Viral-Specific T Cell Receptor" @default.
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• W2043485104 doi "https://doi.org/10.1084/jem.194.7.883" @default.
• W2043485104 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2193488" @default.
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• W2043485104 hasPublicationYear "2001" @default.
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