- PMID:
10894169 , Related PDB id: 1F3J
- Authors:
- Latek RR, Suri A, Petzold SJ, Nelson CA, Kanagawa O, Unanue ER, Fremont DH
- Title:
- Structural basis of peptide binding and presentation by the type I diabetes-associated MHC class II molecule of NOD mice.
- Journal:
- Immunity. 2000 Jun;12(6):699-710.
- Abstract:
- We have determined the crystal structure of I-Ag7, an integral component in murine type I diabetes development. Several features distinguish I-Ag7 from other non-autoimmune-associated MHC class II molecules, including novel peptide and heterodimer pairing interactions. The binding groove of I-Ag7 is unusual at both terminal ends, with a potentially solvent-exposed channel at the base of the P1 pocket and a widened entrance to the P9 pocket. Peptide binding studies with variants of the hen egg lysozyme I-Ag7 epitope HEL(11-25) support a comprehensive structure-based I-Ag7 binding motif. Residues critical for T cell recognition were investigated with a panel of HEL(11-25)-restricted clones, which uncovered P1 anchor-dependent structural variations. These results establish a framework for future experiments directed at understanding the role of I-Ag7 in autoimmunity.