In Vitro Cell-Free Assay: In a final reaction volume of 50 μl, CK2 ααββ (4 ng, 8.5 mU) was incubated with various concentrations of test compounds in DMSO (1 ul, 2% by volume), 20 mM MOPS pH 7.2, 10 mM EGTA, 0.15 M NaCl, 10 mM DTT, 0.002% Brij-35, 200 μM RRRDDDSDDD (SEQ ID NO.: 4), 10 mM MgAcetate, ATP 15 uM and 0.33% (by volume) (hr-3311ATP: Stock 1 mCi/100 μl; 3000 Ci/mmol (Perkin Elmer)). Reactions were maintained for 40 min at 23° C. The reactions were quenched with 100 ul of 0.75% Phosphoric acid, then transferred to and filtered through a Phosphocellulose filter plate (Millipore, MSPH-N6B-50). After washing each well 4 times with 0.75% Phosphoric acid, scintillation fluid (20 uL) was added to each well and the residual radioactivity was measured using a Wallac luminescence counter.
Inhibition of CK2alpha1/beta (unknown origin) at 0.1 uM pretreated for 30 mins followed by substrate addition measured after 5 hrs in presence of 1 mM ATP relative to control
Inhibition of CK2alpha (unknown origin) (2 to 329 residues) expressed in Escherichia coli BL21 (DE3) interaction with CK2beta (unknown origin) using fluorescein tagged RLYGFKIHPMAYQLQ probe after 10 mins by fluorescence polarization assay
Inhibition of [35S]methionine-labelled human recombinant His6-tagged CK2alpha/MBP-tagged CK2beta (unknown origin) interaction incubated for 1 hr by scintillation counting method
Inhibition of human CK2-alpha/beta expressed in Escherichia coli BL21(DE3) at 10 uM using RRRDDDSDDD peptide as substrate after 15 mins by capillary electrophoresis method relative to control
Inhibition of human CK2-alpha/beta expressed in Escherichia coli BL21(DE3) using RRRDDDSDDD peptide as substrate after 15 mins by capillary electrophoresis method
ATP-competitive inhibition of human CK2-alpha/beta expressed in Escherichia coli BL21(DE3) using RRRDDDSDDD peptide as substrate after 15 mins in presence of varying levels of ATP by capillary electrophoresis method