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Mad2, a key component of the spindle checkpoint, is closely associated with chromosomal instability and poor prognosis in cancer. p31 comet  is a Mad2-interacting protein that serves as a spindle checkpoint silencer at mitosis. In this study, we showed that p31 comet -induced apoptosis and senescence occur  via  counteraction of Mad2 activity. Upon retroviral transduction of p31 comet , the majority of human cancer cell lines tested lost the ability to form colonies in a low-density seeding assay. Cancer cells with p31 comet  overexpression underwent distinct apoptosis and/or senescence, irrespective of p53 status, confirming the cytotoxicity of p31 comet . Interestingly, both cytotoxic and Mad2 binding activities were eliminated upon deletion of the C-terminal 30 amino acids of p31 comet . Point mutation or deletion of the region affecting Mad2 binding additionally abolished cytotoxic activity. Consistently, wild-type Mad2 interacting with p31 comet , but not its non-binding mutant, inhibited cell death, indicating that the mechanism of p31 comet -induced cell death involves Mad2 inactivation. Our results clearly suggest that the regions of p31 comet  affecting interactions with Mad2, including the C-terminus, are essential for induction of cell death. The finding that p31 comet -induced cell death is mediated by interactions with Mad2 that lead to its inactivation is potentially applicable in anticancer therapy.

p31comet-Induced Cell Death Is Mediated by Binding and Inactivation of Mad2