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- W2075280179 abstract "Skeletal muscle glycogen a4-synthase (EC 2.4.1.11) has been purified free of all synthase kinase and phosphatase activities by chromatography on a Glc-N-6-P-Sepharose affinity column and then on a phosphocellulose column. This preparation of glycogen synthase was tested as a substrate for purified skeletal muscle phosphorylase kinase (ATP:phosphorylase-b phosphotransferase, EC 2.7.1.38). Phosphorylase kinase (1-10 microgram/ml or 0.03-0.3 microM) catalyzes rapid phosphorylation of glycogen synthase (4.5 microM) associated with conversion of the active a form to the less active b form. In the reaction, greater than 95% of the 32P incorporation from [gamma-32P]ATP goes into the synthase subunit almost exclusively in the trypsin-insensitive region which is responsible for synthase a-to-b conversion. Synthase phosphorylation or inactivations catalyzed by phosphorylase kinase is blocked by ethylene glycol bis(beta-aminoethyl ether)-N,N,N',N'-tetraacetic acid, is ATP dependent, is 10-fold more rapid at pH 8.6 than at pH 6.8, and is increased 10-fold by prior activation of the phosphorylase kinase with MgATP and cyclic AMP. With activated phosphorylase kinase at pH 8.2 the apparent Km and Vmax are approximately 70 microM and 4 mumol/min per mg with glycogen synthase and 70 microM and 9 mumol/min per mg with phosphorylase as substrate. It is concluded that glycogen synthase is a substrate in vitro for phosphorylase kinase, a Ca2+-dependent enzyme. The possible physiological significance of this reaction is discussed." @default.
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- W2075280179 date "1979-06-01" @default.
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- W2075280179 title "Phosphorylation and inactivation of glycogen synthase by phosphorylase kinase." @default.
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- W2075280179 doi "https://doi.org/10.1073/pnas.76.6.2536" @default.
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