Abstract
Faithful chromosome segregation during mitosis depends on the spindle assembly checkpoint (SAC), which monitors kinetochore attachment to the mitotic spindle. Unattached kinetochores generate mitotic checkpoint proteins complexes (MCCs) that bind and inhibit the anaphase-promoting complex, or cyclosome (APC/C). How the SAC proficiently inhibits the APC/C but still allows its rapid activation when the last kinetochore attaches to the spindle is important for the understanding of how cells maintain genomic stability. We show that the APC/C subunit APC15 is required for the turnover of the APC/C co-activator CDC20 and release of MCCs during SAC signalling but not for APC/C activity per se. In the absence of APC15, MCCs and ubiquitylated CDC20 remain ‘locked’ onto the APC/C, which prevents the ubiquitylation and degradation of cyclin B1 when the SAC is satisfied. We conclude that APC15 mediates the constant turnover of CDC20 and MCCs on the APC/C to allow the SAC to respond to the attachment state of kinetochores.
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Acknowledgements
We thank S. Taylor for the HeLa FRT cell line, A. Musacchio for the anti-MAD2 and anti-p31comet antibodies and for communicating results before publication, T. Hunt for the anti-APC3 antibody, members of our laboratory for discussions and O. Nashchekina, F. Walton, E. Russe and S. Wieser for help with somatic cell knock-ins, mass spectrometry, statistical and flow cytometry analyses, respectively. J.M. was supported by FEBS and EMBO fellowships. This work was supported by a project grant from the BBSRC and by a Programme grant from Cancer Research UK to J.P. and core grant support to the Sanger Institute (M.O.C. and J.S.C.) from The Wellcome Trust (grant number 079643/Z/06/Z).
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J.M. carried out all of the experiments, P.C. generated the RPE1 cyclin-A2– and B1–Venus knock-in cell lines, M.O.C. and J.S.C. carried out the mass spectrometry that identified APC15 and the CDC20 ubiquitylation site. J.M. and J.P. designed the experiments and wrote the paper. All authors contributed to the interpretation of the results.
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Mansfeld, J., Collin, P., Collins, M. et al. APC15 drives the turnover of MCC-CDC20 to make the spindle assembly checkpoint responsive to kinetochore attachment. Nat Cell Biol 13, 1234–1243 (2011). https://doi.org/10.1038/ncb2347
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DOI: https://doi.org/10.1038/ncb2347
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