title: Antibody-coated protein A-bearing Staphylococcus aureus: a versatile and stable immune reagent.
abstract: The human beta2-microglobulin antigen-antibody system was used as a model to illustrate the versatility of a microradioimmunoassay technique using protein A-bearing Staphylococcus aureus Cowan I strain (SACI) bacteria as a non-specific immunoadsorbent in place of a second antibody. Experimental conditions are described for a sensitive microassay which makes it possible to process large numbers of samples more rapidly and with minimum handling. Furthermore, SACI coated with specific antibodies by mixing with unfractionated antisera are a versatile reagent not only for radioimmunoassays but also for use as molecular probes to characterize cell surface antigens. Antibody-coated SACI could be lyophilized and proved extremely stable in storage thus providing a unique advantage for use in binding inhibition assays and as versatile reagent for clinical and investigative immunology.
mesh_terms: D000818:Animals; D000918:Antibody Specificity; D000937:Antigen-Antibody Reactions; D001666:Binding Sites, Antibody; D001667:Binding, Competitive; D006801:Humans; D007106:Immune Sera / Q000494:pharmacology; D011817:Rabbits; D011863:Radioimmunoassay; D013205:Staphylococcal Protein A / Q000276:immunology*; D013211:Staphylococcus aureus / Q000276:immunology*; D001613:beta 2-Microglobulin / Q000276:immunology
chemical_list: D007106:Immune Sera; D013205:Staphylococcal Protein A; D001613:beta 2-Microglobulin