Acts as a positive regulator of apoptosis. Phosphorylates myosin light chains (By similarity). 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. Autophosphorylated. Belongs to the protein kinase superfamily. CAMK Ser/Thr protein kinase family. DAP kinase subfamily.