Protein kinase essential for cell division. Plays a key role in initiation of septum formation and cytokinesis. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Interacts with spg1. Seems to interact with cdc11. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family. CDC7 subfamily.