title: Ribonucleoprotein (RNP) soluble nuclear antigen: demonstration of its reaction with serum antibodies by counter-immunoelectrophoresis and further partial characterization.
abstract: The soluble ribonucleoprotein nuclear antigen reactive with specific antibodies present in sera from patients with Mixed Connective Tissure disease has alpha 2-beta 1 electrophoretic mobility, thus enabling its reaction with specific serum antibodies to be studied by counter-immunoelectrophoresis. Its molecular weight determined by elution from a calibrated Sephadex G-200 gel column is about 175,000. Its purification has been attempted by successive DEAE cellulose chromatography, Sephadex G-200 gel filtration and Hydroxyapatite chromatography. Polyacrylamide gel electrophoresis of RNP antigen-containing fractions showed persistent heterogeneity which could be due either to inadequate purification or to dissociation of the RNP-antigen during electrophoresis.
mesh_terms: D000974:Antibodies, Antinuclear; D000937:Antigen-Antibody Reactions; D000941:Antigens / Q000032:analysis* / Q000302:isolation & purification; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D003378:Counterimmunoelectrophoresis; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D006882:Hydroxyapatites; D007122:Immunoelectrophoresis; D009698:Nucleoproteins / Q000276:immunology*; D012261:Ribonucleoproteins / Q000276:immunology*; D012995:Solubility
chemical_list: D000974:Antibodies, Antinuclear; D000941:Antigens; D006882:Hydroxyapatites; D009698:Nucleoproteins; D012261:Ribonucleoproteins