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  • Title: Regulation of yeast phosphorylase by phosphorylase kinase and cAMP-dependent protein kinase.
    Author: Wingender-Drissen R, Becker JU.
    Journal: FEBS Lett; 1983 Oct 31; 163(1):33-6. PubMed ID: 6354752.
    Abstract:
    Yeast phosphorylase is phosphorylated and activated by a cyclic AMP-independent protein kinase (called phosphorylase kinase) and a cyclic AMP-dependent protein kinase. Only in the presence of both kinases is phosphorylase fully activated and phosphorylated. No evidence was found for the presence of two phosphorylation sites as an identical phosphopeptide pattern of phosphorylase is obtained after phosphorylation by either one or both kinases. The kinases probably phosphorylate identical sites but recognize different subunits of phosphorylase. Phosphorylase kinase phosphorylates the high-Mr subunit while cAMP-dependent protein kinase phosphorylates the low-Mr subunit.
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