Casein kinases are operationally defined by their preferential utilization of acidic proteins such as caseins as substrates. The alpha and alpha' chains contain the catalytic site. Participates in Wnt signaling. CK2 phosphorylates 'Ser-389' of p53/TP53 following UV irradiation.
Specificity
Natural and recombinant Mouse Casein kinase II subunit alpha
Tetramer composed of an alpha chain, an alpha' and two beta chains. Interacts with RNPS1. Also component of a CK2-SPT16-SSRP1 complex composed of SSRP1, SUPT16H, CSNK2A1, CSNK2A2 and CSNK2B, the complex associating following UV irradiation.