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The Journal of Immunology, 1998, 160: 802-809.
Copyright © 1998 by The American Association of Immunologists

Degenerate Recognition of Alloantigenic Peptides on a Positive-Selecting Class I Molecule1

Michelle D. Tallquist2,*, Arthur J. Weaver{ddagger} and Larry R. Pease3,*,{dagger}

Departments of * Immunology and {dagger} Molecular Biology and Biochemistry, Mayo Clinic, Rochester, MN 55905; and {ddagger} hkl Research, Inc., Rochester, MN 55902

The well-defined 2C T cell was used to investigate alloreactive degeneracy. A panel of class I molecules that are known ligands for the 2C TCR were sensitized with three known peptide ligands, p2Ca (LSPFPFDL), dEV-8 (EQYKFYSV), and SIYR-8 (SIYRYYGL). The peptide p2Ca was originally identified as the allopeptide seen in the Ld class I molecule by 2C T cells, 2C recognizes the dEV-8 peptide as the ligand in the Kbm3 class I molecule, and SIYR-8 was recently identified as a peptide ligand for 2C in the context of the Kb class I molecule. Strong recognition of all three Ag-presenting molecules occurred in the context of their respective allopeptides, but 2C recognized all three peptides to a measurable extent in the context of Kb. Molecular modeling of these Kb/peptide complexes revealed a high degree of similarity between dEV-8 and SIYR-8, but very little conformational similarity of either of these peptides with p2Ca. Furthermore, the structural changes in the mutant Kbm3 binding site resulted in generalized changes in the conformation of each of five bound peptides compared with those of the same peptides bound to Kb. The finding that degenerate recognition occurs on Kb, the restriction element responsible for selecting 2C T cells, suggests a unique relationship between a TCR and the Ag-presenting molecule that mediates its positive selection.




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