the camp-dependent protein kinase catalyzes the phosphorylation of the alpha- and beta-subunits of the cardiac isozyme of phosphorylase kinase . beta-subunit phosphorylation achieves a maximum level of between 1 to 2 mol of phosphate/mol of phosphorylase kinase , a value less than the stoichiometric content of beta-subunits in the enzyme .
C0022173
isozyme
C0014442
enzyme