TTP 22 is a high affinity, ATP-competitive casein kinase 2 (CK2) inhibitor with IC50/Ki of 0.1 uM/40 nM, and shows selectivity >250-fold for CK2 over JNK3, ROCK1, and MET(IC50> 10 uM).

CK2:0.1 μM

PI3K biochemical assay (ATP depletion assay): BKM120 is dissolved in DMSO and directly distributed into a black 384-well plate at 1.25 μL per well. To start the reaction, 25 μL of 10 nM PI3 kinase and 5 μg/mL 1-α-phosphatidylinositol (PI) in assay buffer (10 mM Tris pH 7.5, 5 mM MgCl2, 20 mM NaCl, 1 mM DTT and 0.05% CHAPS) are added into each well followed by 25 μL of 2 μM ATP in assay buffer. The reaction is performed until approx 50% of the ATP is depleted and then stopped by the addition of 25 μL of KinaseGlo solution. The stopped reaction is incubated for 5 minutes and the remaining ATP is then detected via luminescence.