J. Biol. Chem., Vol. 256, Issue 2, 583-585, Jan, 1981
HeLa ribosomal protein S6. Insulin and dibutyryl cyclic AMP affect different phosphopeptides
SM Lastick and EH McConkey
Tryptic phosphopeptides from HeLa ribosomal protein S6 have been separated
by chromatography, followed by electrophoresis. Three phosphopeptides were
found in S6 from cells treated in vivo with dibutyryl cAMP and at least
four different phosphopeptides were found from cells treated with insulin
plus the essential amino acids. Only phosphoserine was found in S6 isolated
from insulin-treated cells.