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Phosphorylation of muscle phosphofructokinase by the catalytic subunit of cyclic AMP-dependent protein kinase.
Authors:P T Riquelme  M M Hosey  F Marcus  R G Kemp
Institution:Department of Biochemistry, University of Health Sciences/ The Chicago Medical School, Chicago, IL 60612 USA
Abstract:The catalytic subunit of cyclic AMP-dependent protein kinase catalyzes the phosphorylation of rabbit skeletal muscle phosphofructokinase. The reaction is inhibited by the specific inhibitor of protein kinase and proceeds at about 2% the rate observed with phosphorylase kinase but more rapidly than with rat liver fructose bisphosphatase as substrate. Maximum extent of incorporation (0.43 to 0.85 moles per mole of protomer) plus the covalently-bound phosphate present in the isolated enzyme (0.20 to 0.34 moles per mole) approaches one mole per mole.
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