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Protein kinase C, purified to near homogeneity from the brain, has been tested toward a variety of synthetic peptide substrates including different phosphorylatable residues. While it proved totally inactive toward the tyrosyi peptide Asp-Ala-Glu-Tyr-Ala-Ala-Arg-Arg-Arg-Gly, as well as toward several more or less acidic seryl peptides, it phosphorylates with a Ca 2+ /phospholipid-dependent...
The synthetic hexapeptide Ser-Glu-Glu-Glu-Val-Glu and its N-acetylated derivative are readily and specifically phosphorylated by rat liver casein kinase TS (type-2), while the derived heptapeptide with an additional N-terminal Arg is a very poor substrate. Conversely, the substitution of Glu for Val 5 in the synthetic peptide Arg-Arg-Ser-Thr-Val-Ala, which is a good substrate for cAMP-dependent...
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