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Original Article |
Correspondence to: Victor H. Engelhard, Beirne Carter Center for Immunology Research, Medical Research Building 4, Box 801386, Charlottesville, VA 22908. Tel:804-924-2423 Fax:804-924-1221 E-mail:vhe{at}virginia.edu.
Posttranslational modification of peptide antigens has been shown to alter the ability of T cells to recognize major histocompatibility complex (MHC) class Irestricted peptides. However, the existence and origin of naturally processed phosphorylated peptides presented by MHC class I molecules have not been explored. By using mass spectrometry, significant numbers of naturally processed phosphorylated peptides were detected in association with several human MHC class I molecules. In addition, CD8+ T cells could be generated that specifically recognized a phosphorylated epitope. Thus, phosphorylated peptides are part of the repertoire of antigens available for recognition by T cells in vivo.
Key Words: MHC class I, posttranslational protein processing, phosphopeptides, mass spectrometry, cytotoxic T lymphocytes
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