Title: Regulation of casein kinase 2 by phosphorylation/dephosphorylation
Authors: Agostinis, Patrizia ×
Goris, Jozef
Pinna, L A
Merlevede, Wilfried #
Issue Date: Mar-1988
Series Title: The Biochemical journal. vol:248 issue:3 pages:785-9
Abstract: The effects of various polycation-stimulated (PCS) phosphatases and of the active catalytic subunit of the ATPMg-dependent (AMDc) protein phosphatase on the activity of casein kinase 2 (CK-2) were investigated by using the synthetic peptide substrate Ser-Glu-Glu-Glu-Glu-Glu, whose phosphorylated derivative is entirely insensitive to these protein phosphatases. Previous dephosphorylation of native CK-2 enhances its specific activity 2-3-fold. Such an effect, accounted for by an increase in Vmax, is more readily promoted by the PCS phosphatases than by the AMDc phosphatase. The phosphate incorporated by autophosphorylation could not be removed by the protein phosphatases, suggesting the involvement of phosphorylation site(s) other than the one(s) affected by intramolecular autophosphorylation. The activation of CK-2 by the phosphatase pretreatment is neutralized during the kinase assay; the mechanism of this phenomenon, which is highly dependent on the kinase concentration, is discussed.
ISSN: 0264-6021
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Biochemistry Section (Medicine) (-)
Laboratory of Protein Phosphorylation and Proteomics
Laboratory of Cell Death Research & Therapy
× corresponding author
# (joint) last author

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