Isolation and characterization of twenty-three ribosomal proteins from large subunits of yeast

Abstract
The proteins of large ribosomal subunits from S. cerevisiae were separated into 25 fractions by chromatography on columns, of carboxymethylcellulose (CMC). Proteins (23) were then purified from the 12 CMC fractions by filtration through Sephadex G-75, Sephadex G-100 and Sephacryl S-200 and/or by phosphocellulose column chromatography. The isolated proteins are YP 1, YP 2, YP 9, YP 11, YP 13'', YP 16, YP 18, YP 26, YP 39, YP 41, YP 42, YP 42'', YP 44, YP 45, YP 47'', YP 52a, YP 53, YP 55, YP 59, YP 6, YP 68, YP A1 and YP A2. The molecular weight and amino acid composition of these proteins are presented.