title: Differential binding properties of protein A and protein G for dog immunoglobulins.
abstract: We studied the binding of dog immunoglobulins G, A, M and E to protein A and protein G. Passive cutaneous anaphylaxis (PCA) testing was used for the measurement of dog IgE and enzyme-linked immunosorbent assays (ELISA) were used for the measurements of dog IgG, IgA and IgM. Protein A from lyophilized cells of Staphylococcus aureus bound 97% of IgE, 98% of IgG, 81% of IgA, and 97% of IgM. Protein A-Sepharose CL-4B bound 87% of IgE, 100% of IgG and IgA, and 98% of IgM. In a stepwise elution with varying pH, a small amount of IgE was eluted at pH 5 and pH 6 and all the remaining Igs were eluted at pH 3 from the protein A column. In contrast to protein A, dog IgE was not bound to Protein G-Sepharose, while 100% of IgG, 95% of IgA, and 44% of IgM were bound to Protein G-Sepharose.
authors.affiliation: Department of Pediatrics, University of Manitoba, Winnipeg, Canada.
authors.forename: Z K
authors.initials: ZK
authors.lastname: Peng
authors.forename: F E
authors.initials: FE
authors.lastname: Simons
authors.forename: A B
authors.initials: AB
authors.lastname: Becker
mesh_terms: D000818:Animals; D001426:Bacterial Proteins / Q000276:immunology*; D002846:Chromatography, Affinity; D004285:Dogs / Q000276:immunology*; D007070:Immunoglobulin A / Q000378:metabolism; D007073:Immunoglobulin E / Q000378:metabolism; D007074:Immunoglobulin G / Q000378:metabolism; D007075:Immunoglobulin M / Q000378:metabolism; D007136:Immunoglobulins / Q000378:metabolism*; D011485:Protein Binding; D013205:Staphylococcal Protein A / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; C034284:IgG Fc-binding protein, Streptococcus; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D007136:Immunoglobulins; D013205:Staphylococcal Protein A; D007073:Immunoglobulin E