Casein kinases are operationally defined by their preferential utilization of acidic proteins such as caseins as substrates. Can phosphorylate a large number of proteins. Participates in Wnt signaling. Phosphorylates DVL1. Central component of the circadian clock. May act as a negative regulator of circadian rhythmicity by phosphorylating PER1 and PER2. Retains PER1 in the cytoplasm. Inhibits cytokine-induced granuloytic differentiation.
[1]"Isolation and characterization of human casein kinase I epsilon (CKI), a novel member of the CKI gene family."Fish K.J., Cegielska A., Getman M.E., Landes G.M., Virshup D.M.J. Biol. Chem. 270:14875-14883(1995) [2]"Casein kinase I epsilon from HeLa ce