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Department of Microbiology and Immunology, Emory University; and
Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322
The OVA323339 epitope recognized by DO11.10 (H-2d) and OT-II (H-2b) T cells was investigated using amino- and carboxy-terminal truncations to locate the approximate ends of the epitopes and single amino acid substitutions of OVA323339 to identify critical TCR contact residues of the OVA323339 peptide. DO11.10 and OT-II T cells are both specific for a C-terminal epitope whose core encompasses amino acids 329337. Amino acid 333 was identified as the primary TCR contact residue for both cells, and amino acid 331 was found to be an important secondary TCR contact residue; however, the importance of other secondary TCR contact residues and peptide flanking residues differ between the cells. Additional OVA323339-specific clones were generated that recognized epitopes found in the N-terminal end or in the center of the peptide. These findings indicate that OVA323339 can be presented by I-Ad in at least three binding registers. This study highlights some of the complexities of peptide Ags such as OVA323339, which contain a nested set of overlapping T cell epitopes and MHC binding registers.
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