Figure 1. PKCtheta kinase activity was measured in a radiometric assay using the following reaction conditions: 60 mM HEPES-NaOH, pH 7.5, 5 mM MgCl2, 1.32 mM CaCl2, 1 mM EDTA, 1.25 mM EGTA, 0.25 μg/50 μl Phosphatidylserine, 50 ng/50 μl 1.2 Dioleyl-glycerol, 1.2 mM DTT, ATP (variable), 2.5 μg/50 μl PEG 20.000, Substrate: Histone H2B, 2 μg/50 μl and recombinant PKCtheta: 200 ng/50 µl.