Kinesin family member that is involved in spindle formation and the movements of chromosomes during mitosis and meiosis. Binds to microtubules and to DNA. Plays a role in congression of laterally attached chromosomes in NDC80-depleted cells. Interacts with FAM83D and SIAH1. Ubiquitinated; mediated by SIAH1 and leading to its subsequent proteasomal degradation. Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Kinesin family.