Phosphorylates myosin light chains (By similarity). Acts as a positive regulator of apoptosis. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Interacts with CHP1; the interaction induces CHP1 to translocate from the Golgi to the nucleus. Colocalizes with STK17B at the plasma membrane. Highly expressed in placenta, lung, pancreas. Lower levels in heart, brain, liver, skeletal muscle and kidney. Autophosphorylated. Belongs to the protein kinase superfamily. CAMK Ser/Thr protein kinase family. DAP kinase subfamily.