Microtubule-associated force-producing protein that plays a role in organelle transport. Its motor activity is directed toward the microtubule's plus end (By similarity). Required for cytokinesis. May be involved in a vesicle-mediated transport of myosin II, the Aurora kinase (aurK) and other proteins along mitotic extracellular microtubules toward the center of the cell and the cleavage furrow in order to ensure cell division coupled to mitosis. Concentrates in the nucleus in interphase cells, translocates to the cytoplasm at the onset of mitosis, appears in the centrosomes and spindle, and later is concentrated in the spindle midbody. Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Kinesin family.