Epitopes described in "Crystal structure of the complex between human CD8alpha(alpha) and HLA-A2."

Article Authors:G F Gao; J Tormo; U C Gerth; J R Wyer; A J McMichael; D I Stuart; J I Bell; E Y Jones; B K Jakobsen
Article Title:Crystal structure of the complex between human CD8alpha(alpha) and HLA-A2.
Reference Detail
Reference ID:1025033
Abstract:The dimeric cell-surface glycoprotein CD8 is crucial to the positive selection of cytotoxic T cells in the thymus. The homodimer CD8alpha(alpha) or the heterodimer alpha beta stabilizes the interaction of the T-cell antigen receptor (TCR) with major histocompatibility complex (MHC) class I/peptide by binding to the class I molecule. Here we report the crystal structure at 2.7 A resolution of a complex between CD8alpha(alpha) and the human MHC molecule HLA-A2, which is associated with peptide. CD8alpha(alpha) binds one HLA-A2/peptide molecule, interfacing with the alpha2 and alpha3 domains of HLA-A2 and also contacting beta2-microglobulin. A flexible loop of the alpha3 domain (residues 223-229) is clamped between the complementarity-determining region (CDR)-like loops of the two CD8 subunits in the classic manner of an antibody-antigen interaction, precluding the binding of a second MHC molecule. The position of the alpha3 domain is different from that in uncomplexed HLA-A2, being most similar to that in the TCR/Tax/HLA-A2 complex, but no conformational change extends to the MHC/peptide surface presented for TCR recognition. Although these shifts in alpha3 may provide a synergistic modulation of affinity, the binding of CD8 to MHC is clearly consistent with an avidity-based contribution from CD8 to TCR-peptide-MHC interactions.
Affiliations:Molecular Immunology Group, Nuffield Department of Clinical Medicine, Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, UK.
Reference Type:Literature
PubMed ID:9177355
Journal Volume:387
Article Pages:630-4
Journal ISSN:0028-0836
Article Chemical List:Antigens, CD8;HLA-A2 Antigen;Recombinant Proteins
Article MeSH List:Antigens, CD8(chemistry; metabolism); Cloning, Molecular; Crystallography, X-Ray; Escherichia coli; HLA-A2 Antigen(chemistry; metabolism); Humans; Models, Biological; Molecular Sequence Data; Protein Binding; Protein Conformation; Recombinant Proteins(chemistry)
Curation Last Updated:2014-10-03 22:46:58