Part of a chromosomal passenger complex. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Interacts with icpA. Forms a complex at the central spindle. When cells entered mitosis, found at spindle poles during prometaphase. With the onset of anaphase, localized at the central spindle and remained there during telophase and early cytokinesis. At the end of cytokinesis, localized at the cytoplasmic bridge and eventually to breaking points. Also found at the cleavage furrow, late in cytokinesis, when the furrow becomes a thin cytoplasmic bridge. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family. Aurora subfamily.