title: Binding of canine IgM and IgG to protein A of Staphylococcus aureus: a simple method for the isolation of canine immunoglobulins from serum and the lymphocyte surface.
abstract: The binding of normal canine serum IgG and IgM to staphylococcal protein A is described. Virtually all (greater than 99%) of IgG and up to 90% of IgM could be removed from canine serum, utilizing this phenomenon. The nature of the bound material was confirmed by immunodiffusion in agar, radioimmunoassay, and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Attempts to elute differentially IgG and IgM from protein A-Sepharose columns, using gradients of pH or the chaotropic agent sodium thiocyanate, were unsuccessful. This phenomenon provides a basis for the isolation of canine IgM from serum. Lymphocyte surface IgM, studied by lactoperoxidase-catalyzed membrane radioiodination and solubilization in nonionic detergent, also showed the property of binding to staphylococcal protein A.
mesh_terms: D000818:Animals; D002846:Chromatography, Affinity; D002850:Chromatography, Gel; D004285:Dogs / Q000276:immunology*; D005779:Immunodiffusion; D007074:Immunoglobulin G / Q000302:isolation & purification* / Q000378:metabolism; D007075:Immunoglobulin M / Q000302:isolation & purification* / Q000378:metabolism; D008214:Lymphocytes / Q000276:immunology*; D011485:Protein Binding; D011947:Receptors, Antigen, B-Cell / Q000302:isolation & purification* / Q000378:metabolism; D013205:Staphylococcal Protein A / Q000276:immunology* / Q000378:metabolism
chemical_list: D007074:Immunoglobulin G; D007075:Immunoglobulin M; D011947:Receptors, Antigen, B-Cell; D013205:Staphylococcal Protein A