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- W1969470151 abstract "Cytochrome P-450 isozymes P-450(16 alpha), P-450(15 beta), and P-450DEa are immunochemically related, as indicated by mutual cross-reactivity with polyclonal antibody preparations. We have isolated five monoclonal antibodies to P-450(15 beta) and one antibody to P-450(16 alpha) that show selectivity for the respective antigens. High frequencies of cross-reactivity were observed, indicating a high degree of homology among P-450(16 alpha), P-450(15 beta), and P-450DEa. All of the P-450(15 beta-specific antibodies bound to the same epitope, or closely grouped epitopes, supporting this conclusion. The specificity of each monoclonal antibody was characterized by enzyme-linked immunosorbent assay. Western immunoblotting, and antibody-Sepharose immunoadsorption of solubilized rat liver microsomes. Antibodies F22 and F23, which were apparently identical, were specific for P-450(15 beta) by these criteria. However, the apparent specificities of antibodies F3 and F20 for P-450(15 beta), and of M16 for P-450(16 alpha), were highly dependent on the analytical technique used. The five anti-P-450(15 beta) antibodies all inhibited the catalytic activity of microsomal P-450(15 beta), by a maximum of 70%. However, they also produced a similar inhibition of microsomal P-450(16 alpha-specific antibody M16 and F23 have a low-affinity interaction with an epitope on P-450(16 alpha). The P-450(16 alpha)-specific antibody M16 was not inhibitory. The results indicate that the apparent specificity of a monoclonal antibody for an antigen determined by, e.g., Western blotting does not allow the conclusive identification of a protein in another system, e.g., immunoprecipitation of in vitro translation reaction products.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W1969470151 date "1987-07-14" @default.
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- W1969470151 title "Preparation and characterization of monoclonal antibodies recognizing unique epitopes on sexually differentiated rat liver cytochrome P-450 isozymes" @default.
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- W1969470151 doi "https://doi.org/10.1021/bi00388a003" @default.
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