1iak
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HISTOCOMPATIBILITY ANTIGEN I-AK
OverviewOverview
We have determined the structure of murine MHC class II I-Ak in complex, with a naturally processed peptide from hen egg lysozyme (HEL residues, 50-62) at 1.9 A resolution. These results provide a structural basis for, the I-Ak peptide-binding motif. Binding is established by the deep burial, of five anchor side chains into specific pockets of the I-Ak binding, groove, with a zen-like fit of an aspartic acid in the P1 pocket. We also, show that in the I-Ak alpha chain, a bulge occurs in the first strand of, the peptide-binding platform, an insertion probably common to all I-A and, HLA-DQ alleles. The I-Ak beta chain has a deletion in the helical region, adjacent to the P7 pocket and an insertion in the helical region, neighboring the P1 pocket. As a result of these structural features, the, extended HEL peptide dips low into the center of the I-Ak groove and, reaches toward solvent at its C-terminal end.
About this StructureAbout this Structure
1IAK is a Protein complex structure of sequences from Mus musculus with NAG as ligand. Full crystallographic information is available from OCA.
ReferenceReference
Crystal structure of I-Ak in complex with a dominant epitope of lysozyme., Fremont DH, Monnaie D, Nelson CA, Hendrickson WA, Unanue ER, Immunity. 1998 Mar;8(3):305-17. PMID:9529148
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