Non-immune immunoglobulin binding by "Haemophilus somnus".
In-vitro culture of Haemophilus somnus in liquid or solid media supplemented with bovine blood or serum resulted in non-immune binding of immunoglobulin (Ig) by the organism. This binding was independent of the antigen-combining site of the Ig molecule, since binding of an IgG preparation specific for the hapten dinitrophenol was unaffected by the presence of the homologous antigen. Quantitative comparison of the binding of Ig fragments Fab and Fc demonstrated that the non-immune binding occurred in the Fc region of bovine IgG. The isotypes of Ig that became bound to H. somnus included both bovine IgG subclasses (IgG1 and IgG2), which were bound equally, and bovine IgM.
Widders
P R
PR
Department of Veterinary Microbiology and Pathology, Washington State University, Pullman 99164-7040.
Smith
J W
JW
Yarnall
M
M
McGuire
T C
TC
Corbeil
L B
LB
D000818:Animals; D000907:Antibodies, Bacterial / Q000378:metabolism; D000918:Antibody Specificity; D002417:Cattle; D004140:Dinitrophenols / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D006190:Haemophilus / Q000378:metabolism*; D007140:Immunoglobulin Fab Fragments / Q000378:metabolism; D007141:Immunoglobulin Fc Fragments / Q000378:metabolism; D007074:Immunoglobulin G / Q000378:metabolism; D007075:Immunoglobulin M / Q000378:metabolism; D007136:Immunoglobulins / Q000378:metabolism*; D011485:Protein Binding; D012710:Serum Albumin, Bovine / Q000276:immunology
D000907:Antibodies, Bacterial; D004140:Dinitrophenols; D007140:Immunoglobulin Fab Fragments; D007141:Immunoglobulin Fc Fragments; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D007136:Immunoglobulins; D012710:Serum Albumin, Bovine