P5/P5' the acidic ribosomal phosphoproteins from Saccharomyces cerevisiae.

P5/P5', the most acidic and exchangeable phosphoproteins from the large ribosomal subunit in the yeast Saccharomyces cerevisiae, were purified from the rest of the ribosomal proteins by means of polyacrylamide gel electrophoresis. Antibodies against the pure P5/P5' proteins cross-reacted with polypeptides from the cytoplasm suggesting that a cytoplasmic pool of P5/P5' exist. The cytoplasmic polypeptides immunologically related to P5/P5' are not phosphorylated.