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The structure of the human MHC class I molecule HLA-B53 complexed to two nonameric peptide epitopes (from the malaria parasite P. falciparum and the HIV2 gag protein) has been determined by X-ray crystallography at 2.3 angstrom resolution. The structures reveal the architecture of a Pro-specific B pocket common to many HLA-B alleles. Relative to other alleles, the B53 peptide-binding groove is widened by a significant (up to 1.25 angstrom) shift in the position of the alpha 1 helix. Within this groove, bound water molecules, acting in concert with the side chains of polymorphic residues, provide the functional malleability of the MHC, which enables the high affinity/low specificity binding of multiple peptide epitopes.

Type

Journal article

Journal

Immunity

Publication Date

03/1996

Volume

4

Pages

215 - 228

Keywords

Amino Acid Sequence, Amino Acids, Base Sequence, Crystallography, X-Ray, HLA Antigens, Humans, Models, Molecular, Molecular Sequence Data, Peptides, Polymorphism, Genetic, Protein Binding, Protein Conformation, Structure-Activity Relationship, Water