Chelerythrine is potent, cell-permeable inhibitor of protein kinase C (IC50 = 660 nM). competitive with respect to the phosphate acceptor and non-competitive with respect to ATP. Chelerythrine has a wide range of biological activities, including antiplatelet, anti-inflammatory, antibacterial and antitumor effects. Activates MAPK pathways, independent of PKC inhibition. Inhibits binding of BclXL to Bak (IC50 = 1.5 μM) or Bad proteins and stimulates apoptosis.