Mitotic kinesin required for chromosome passenger complex (CPC)-mediated cytokinesis. Following phosphorylation by PLK1, involved in recruitment of PLK1 to the central spindle. Interacts with guanosine triphosphate (GTP)-bound forms of RAB6A and RAB6B. May act as a motor required for the retrograde RAB6 regulated transport of Golgi membranes and associated vesicles along microtubules. Has a microtubule plus end-directed motility. Localizes to the spindle midzone during anaphase and telophase. Phosphorylated by PLK1 at Ser-527 during mitosis, creating a docking site for PLK1 and recruiting PLK1 at central spindle. Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Kinesin family.