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The dissociated regulatory subunit (R II ) of autophosphorylated cAMP-dependent protein kinase II was dephosphorylated by the catalytic subunits of protein phosphatase-1 and -2A (phosphatase-1 c and -2A c ) and by a high-M r , polycation-dependent form of phosphatase-2A (2A 0 ) with K m values of 5,0.3 and 1 μM, respectively. Dissociation of protein...
Heparin inhibited the dephosphorylation of rabbit skeletal muscle or liver phosphorylase a by protein phosphatase-1. Other glycosaminoglycans (chondroitin sulfates) and their constituents were found to be without effect. The chromatography of a partially purified phosphatase preparation on heparin-Sepharose CL-6B resulted in a fraction that did not bind to the matrix and its activity was not inhibited...
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