Primary Citation of Related Structures: 1IAO, 2IAD
PubMed Abstract:
We have determined the structures of I-Ad covalently linked to an ovalbumin peptide (OVA323-339) and to an influenza virus hemagglutinin peptide (HA126-138). The floor of the peptide-binding groove contains an unusual beta bulge, not seen in I-E and DR structures, that affects numerous interactions between the alpha and beta chains and bound peptide ...
We have determined the structures of I-Ad covalently linked to an ovalbumin peptide (OVA323-339) and to an influenza virus hemagglutinin peptide (HA126-138). The floor of the peptide-binding groove contains an unusual beta bulge, not seen in I-E and DR structures, that affects numerous interactions between the alpha and beta chains and bound peptide. Unlike other MHC-peptide complexes, the peptides do not insert any large anchor residues into the binding pockets of the shallow I-Ad binding groove. The previously identified six-residue "core" binding motif of I-Ad occupies only the P4 to P9 pockets, implying that specificity of T cell receptor recognition of I-Ad-peptide complexes can be accomplished by peptides that only partially fill the MHC groove.
Related Citations:
Erratum. Crystal Structures of Two I-Ad-Peptide Complexes Reveal that High Affinity Can be Achieved without Large Anchor Residues Scott, C.A., Peterson, P.A., Teyton, L., Wilson, I.A. (1998) Immunity 8: 531
Engineering Protein for X-Ray Crystallography: The Murine Major Histocompatibility Complex Class II Molecule I-Ad Scott, C.A., Garcia, K.C., Stura, E.A., Peterson, P.A., Wilson, I.A., Teyton, L. (1998) Protein Sci 7: 413
Role of Chain Pairing for the Production of Functional Soluble Ia Major Histocompatibility Complex Class II Molecules Scott, C.A., Garcia, K.C., Carbone, F.R., Wilson, I.A., Teyton, L. (1996) J Exp Med 183: 2087
Organizational Affiliation:
Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.
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