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Artifactual immunofluorescent labelling in yeast, demonstrated by affinity purification of antibody
Author(s) -
Lillie S. H.,
Brown S. S.
Publication year - 1987
Publication title -
yeast
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.923
H-Index - 102
eISSN - 1097-0061
pISSN - 0749-503X
DOI - 10.1002/yea.320030202
Subject(s) - yeast , biology , antibody , staining , nitrocellulose , antigen , microbiology and biotechnology , affinity chromatography , immune system , saccharomyces cerevisiae , immunology , biochemistry , enzyme , genetics , membrane
In the course of making antibodies against various yeast ( S. cerevisiae ) proteins, we have noted that it is common to observe reactivity of rabbit sera with a number of extraneous bands on Western transfers of yeast proteins. The pattern of reactive bands can change within a period of weeks, even when the rabbit has not been injected with antigen. A simple method of affinity purification, using antigen bound to nitrocellulose, is employed to remove the reactivity with these extraneous bands from immune sera. The importance of affinity purification is demonstrated by our attempts to immunolocalize a 55 kd yeast protein (p55). Immune serum stains yeast cells to give a striking pattern of spots and blotches not seen with preimmune serum. However, affinity purification of anti‐p55 antibody shows that this pattern is not due to staining by anti‐p55 antibody; rather the pattern is due to staining left in the serum depleted of anti‐p55 antibody.