Fig. 5: The regulation of hPhK by Ca2+.
From: Molecular basis for the regulation of human phosphorylase kinase by phosphorylation and Ca2+

a Structure overlay of the γ subunit and CaM (δ) complex in the apo state and the Ca2+ binding state. b EM map of the γ subunit and CaM in two states (left, without Ca2+, right: with Ca2+). In the presence of Ca2+, only one lobe of CaM density is observable.