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  • Title: Phosphorylation of the glycogen-binding subunit of protein phosphatase-1G in response to adrenalin.
    Author: MacKintosh C, Campbell DG, Hiraga A, Cohen P.
    Journal: FEBS Lett; 1988 Jul 04; 234(1):189-94. PubMed ID: 2839360.
    Abstract:
    The glycogen-binding (G) subunit of protein phosphatase-1 is phosphorylated in vivo. In rabbits injected with propranolol the serine residue termed site-1 was phosphorylated in 56% of the molecules isolated, and phosphorylation increased to 82% after administration of adrenalin. It is concluded that the G-subunit is a physiological substrate for cyclic AMP-dependent protein kinase. The G-subunit remained largely bound to glycogen even after injection of adrenalin, whereas half of the protein phosphatase-1 activity associated with glycogen was released into the cytosol. The results indicate that adrenalin induces dissociation of the catalytic subunit from the G-subunit in vivo.
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