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A synthetic peptide, KKKKRFSFKKSFKLSGFSFKK, containing the phosphorylation sites of the acidic 80-87 kDa protein kinase C substrate was used to identify phosphopeptides in enzyme digests of this protein from mouse fibroblast C3H/10T1/2 cells. Stimulation of phosphorylation occurred, in vivo, with TPA at Ser7, Ser11 and Ser18, and, with two less potent phorbol esters, at Ser7 and Ser18. Okadaic acid effected a net phosphorylation of Ser7 and/or Ser11. Solid-phase sequencing showed that, in vitro, the order of initial rate of phosphorylation was Ser11 greater than Ser7 greater than Ser18, while Ser18 was preferentially phosphorylated when either Ser7 or Ser11 was occupied. No significant phosphorylation of Ser15 was detected.

Original publication




Journal article


Febs lett

Publication Date





285 - 291


Amino Acid Sequence, Animals, Cell Line, Chromatography, High Pressure Liquid, Electrophoresis, Polyacrylamide Gel, Fibroblasts, Mice, Mice, Inbred C3H, Molecular Sequence Data, Phosphopeptides, Phosphorylation, Protein Kinase C, Spectrometry, Mass, Fast Atom Bombardment, Substrate Specificity