title: Identifying interaction motifs in CK2beta--a ubiquitous kinase regulatory subunit.
abstract: Casein kinase 2 (CK2) is probably the most ubiquitous serine/threonine kinase found in eukaryotes: it phosphorylates >300 cellular proteins, ranging from transcription factors to proteins involved in chromatin structure and cell division. CK2 is a heterotetrameric enzyme that induces neoplastic growth when overexpressed. The beta subunit of CK2 (CK2beta) functions as the regulator of the catalytic CK2alpha and CK2alpha' subunits, enhancing their stability, activity and specificity. However, CK2beta also functions as a multisubstrate docking platform for several other binding partners. Here, we discuss the organization and roles of interaction motifs of CK2beta, postulate new protein-interaction sites and map these to the known interaction motifs, and show how the resulting complexity of interactions mediated by CK2 gives rise to the versatile functions of this pleiotropic protein kinase.
authors.affiliation: Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, UK. victor@cryst.bioc.cam.ac.uk
authors.forename: Victor Martin
authors.initials: VM
authors.lastname: Bolanos-Garcia
authors.forename: Juan
authors.initials: J
authors.lastname: Fernandez-Recio
authors.forename: Jorge E
authors.initials: JE
authors.lastname: Allende
authors.forename: Tom L
authors.initials: TL
authors.lastname: Blundell
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D000818:Animals; D047390:Casein Kinase II / Q000737:chemistry* / Q000502:physiology*; D020134:Catalytic Domain; D002843:Chromatin / Q000737:chemistry; D019281:Dimerization; D006801:Humans; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011485:Protein Binding; D011487:Protein Conformation; D017434:Protein Structure, Tertiary; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity
chemical_list: D002843:Chromatin; D047390:Casein Kinase II