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Aurora-C is a member of a novel family of serine/threonine kinases that have been identified as key regulators of the mitotic cell division process (1). Studies show that human Aurora-C is a chromosomal passenger protein that forms complexes with Aurora-B and inner centromere protein (INCENP), which are known passenger proteins. INCENP binds and activates Aurora-C in vivo and in vitro. Aurora-C co-expressed with INCENP elicits the phosphorylation of endogenous histone H3 in mammalian cells, even though this phosphorylation is not sufficient to establish chromosome condensation in interphase cells (2). Over-expression of an inactive mutant of Aurora C impaired the localization of Aurora C to the spindle midzone resulting in multinucleation which demonstrates that Aurora C is required for cytokinesis (3).
