title: High-affinity binding of staphylococcal enterotoxins A and B to HLA-DR.
abstract: Staphylococcal enterotoxins A-E (refs 1-3), toxic shock toxin (TST-1) (ref. 1), a product of Mycoplasma arthritidis and the Mls antigens provoke dramatic T-cell responses. All are extremely potent polyclonal mitogens stimulating a large proportion of both murine and human CD4+ and CD8+T cells although activity is tightly restricted by major histocompatibility complex (MHC) class II antigens. The murine T-cell response to staphylococcal enterotoxin B (SEB) has recently been shown to involve only those T cells expressing T-cell receptor V beta 3, 8.1, 8.2 and 8.3 domains, a situation which closely mimics the response to Mls antigens. This paper examines the initial events in SEA and SEB T-cell activation and shows that MHC restriction results from a direct high affinity binding by intact SEA and SEB to the same site on MHC class II HLA-DR antigens.
authors: Department of Immunobiology, School of Medicine, University of Auckland, New Zealand.
authors: J D
authors: JD
authors: Fraser
mesh_terms: D001665:Binding Sites; D002460:Cell Line; D004768:Enterotoxins / Q000378:metabolism*; D006684:HLA-DR Antigens / Q000378:metabolism*; D006801:Humans; D008213:Lymphocyte Activation; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D004768:Enterotoxins; D006684:HLA-DR Antigens; C026066:enterotoxin A, Staphylococcal; C031818:enterotoxin B, staphylococcal