P31(comet) inactivates the chemically induced Mad2-dependent spindle assembly checkpoint and leads to resistance to anti-mitotic drugs.

ABSTRACT: Mad2 is a key component of the spindle assembly checkpoint (SAC) that delays the onset of anaphase until all kinetochores are attached to the spindle. It binds to Cdc20 and prevents it from promoting destruction of an anaphase inhibitor, Securin. Previously, we showed that a Mad2-binding protein, p31(comet), formed a complex with Mad2 upon the completion of spindle attachment. Here, we showed that the overexpression of p31(comet) can abolish the Mad2-dependent SAC that is induced by anti-mitotic drugs, including nocodazole, taxol, and monastrol; these drugs, except monastrol, cause aneuploidy in HeLa cells. In the absence of Eg5, which is a target of monastrol, overexpression of p31(comet) caused premature destruction of Securin and premature sister chromatid separation, but it did not cau

SUBMITTER: Habu T 

PROVIDER: S-EPMC3824705 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature