Figure 3From: Structural basis of regulation and substrate specificity of protein kinase CK2 deduced from the modeling of protein-protein interactionsThe charge density distribution on the 3-D structures of (a) calmodulin and (b) PKCK2α. The catalytic subunit is largely positively charged at the substrate binding region (blue) and calmodulin is negatively charged (red) on their surface. Figure generated using GRASP [59].Back to article page