The CK1 kinases (Casein Kinase 1 family) share a highly conserved kinase domain. CK1 kinases are serine/threonine kinases with a preference for acidic substrates. The highly variable C-terminal domains are involved in regulating subcellular localization and activity. (Adapted from FBrf0132098, PMID:24825444 and PMID:15722192).
Notes on Group
Casein is not the physiological substrate for this family (PMID:24825444).