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- W1498560711 abstract "To facilitate the isolation of externally exposed plasma membrane proteins we have improved a method that utilizes the non-permeant alkylating reagent trinitrobenzene sulfonate (TNBS). Biosynthetically labeled cells were incubated with TNBS using conditions which minimized penetration into the cells and cell damage (10 mM TNBS, pH 7.8 in PBS; 30 min at 4 °C). The viable cells were incubated with rabbit anti-dinitrophenyl (DNP) IgG. After removal of the excess IgG, the cells were lysed in non-ionic detergent and the anti-DNP IgG-TNP-protein complexes were isolated by adsorption with fixed Staphylococcus aureus or protein-A Sepharose. Proteins thus isolated were analysed by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). When the cells were first treated with TNBS and then metabolically labeled, a hitherto unsuspected major contamination by adsorbed non-derivatized proteins was observed. Under these conditions the TNBS-derivatized proteins should not be metabolically labeled. The contaminating proteins were not removed by washing the immunoadsorbent with deoxycholate, digitonin, saponin, pH 11 carbonate buffer, or 1.5 M ammonium thiocyanate. However, the non-specifically adsorbed proteins were removed by washing with an SDS/NP-40 mixture (0.1% SDS, 0.05% NP-40, 0.6 M NaCl, 10 mM Tris-HCl, pH 8.6). After having assessed and reduced the extent of contamination by non-derivatized proteins, we compared metabolically labeled TNP-proteins isolated by this procedure with anti-macrophage antiserum immunoprecipitates. [35S]Methionine-labeled proteins isolated by the TNBS method were also compared with total 125I surface labeled proteins, and with 125I-labeled surface proteins isolated after TNBS derivatization and immunoprecipitation. Analysis of autoradiograms of SDS-PAGE gels showed that all of these methods resulted in the identification of remarkably similar sets of proteins. There was consistent agreement between 125I-labeled surface proteins and [35S]methionine-labeled proteins isolated from different cell types, including thioglycollate-elicited macrophages, the J774 macrophage cell line, mouse L cells, and Chinese hamster ovary cells (CHO). Proteins of thioglycollate-elicited macrophages labeled with [35S]methionine, [1-14C]mannose, and [1-14C]-glucosamine were isolated after TNBS derivatization and gave identical gel profiles, suggesting that most if not all of the surface proteins isolated by this method were glycosylated." @default.
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- W1498560711 date "1981-05-01" @default.
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- W1498560711 title "Studies on externally disposed plasma membrane proteins" @default.
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- W1498560711 doi "https://doi.org/10.1016/0014-4827(81)90361-x" @default.
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