Purity: > 95% by SDS - PAGE Format: Liquid. 20mM Tris pH8.0, 10% glycerol, 0.2M NaCl, 1mM DTT, 1mM EDTA. Casein Kinase 2 (CK2, also called PKCK2) is a ubiquitous Ser/Thr kinase expressed in all eukaryotes. CK2 is a tetramer composed of two catalytic kinase domains, alpha subunits, and two identical regulatory beta subunits. It has been implicated in cell cycle control, DNA repair, regulation of the circadian rhythm, and other cellular processes. The beta subunit itself does not have kinase activity, but confers stability to the CK2 alpha subunit and is involved in activity and substrate specificity. Recombinant human CK2beta was expressed in E.coli and purified by using conventional chromatography techniques.