title: MHC class II interaction with CD4 mediated by a region analogous to the MHC class I binding site for CD8.
abstract: Interactions between major histocompatibility complex (MHC) molecules and the CD4 or CD8 coreceptors have a major role in intrathymic T-cell selection. On mature T cells, each of these two glycoproteins is associated with a class-specific bias in MHC molecule recognition by the T-cell receptor. CD4+ T cells respond to antigen in association with MHC class II molecules and CD8+ T cells respond to antigen in association with MHC class I molecules. Physical interaction between the CD4/MHC class II molecules and CD8/MHC class I molecules has been demonstrated by cell adhesion assay, and a binding site for CD8 on class I has been identified. Here we demonstrate that a region of the MHC class II beta-chain beta 2 domain, structurally analogous to the CD8-binding loop in the MHC class I alpha 3 domain, is critical for function with both mouse and human CD4.
authors.affiliation: Lymphocyte Biology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892.
authors.forename: R
authors.initials: R
authors.lastname: König
authors.forename: L Y
authors.initials: LY
authors.lastname: Huang
authors.forename: R N
authors.initials: RN
authors.lastname: Germain
mesh_terms: D000818:Animals; D001483:Base Sequence; D001665:Binding Sites / Q000502:physiology; D015704:CD4 Antigens / Q000276:immunology*; D016827:CD8 Antigens / Q000276:immunology*; D003198:Computer Simulation; D004306:Dose-Response Relationship, Immunologic; D015395:Histocompatibility Antigens Class I / Q000276:immunology*; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006801:Humans; D006825:Hybridomas; D066298:In Vitro Techniques; D051379:Mice; D008969:Molecular Sequence Data; D009841:Oligonucleotides / Q000235:genetics; D014162:Transfection
chemical_list: D015704:CD4 Antigens; D016827:CD8 Antigens; D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II; D009841:Oligonucleotides