the current evidence suggests that the regulation of phosphorylase kinase by ca2+ in vivo is achieved through the interaction of this divalent cation with calmodulin ( the delta subunit ) and troponin c , and that the relative importance of these two calcium binding proteins depends on the state of phosphorylation of the enzyme [ figure 1 ] .
C0077400
troponin c
C0006732
calcium binding proteins