AURKB/AurB

Aurora B is the enzymatic core of the chromosomal passenger complex, in which it partners with INCENP, survivin and borealin to travel from chromosome arms in early mitosis to inner centromeres and then to the central spindle. It phosphorylates histone H3 and multiple kinetochore substrates to destabilize erroneous microtubule attachments, enforcing the fidelity requirements of the spindle assembly checkpoint, and it is required for cytokinesis. AURKB overexpression is common in tumors and correlates with aneuploidy, and selective inhibitors such as barasertib have been tested in acute myeloid leukemia, underscoring its mitosis-specific therapeutic appeal.