TRIP13 and APC15 drive mitotic exit by turnover of interphase- and unattached kinetochore-produced MCC

Dong Hyun Kim, Joo Seok Han, Peter Ly, Qiaozhen Ye, Moira A. McMahon, Kyungjae Myung, Kevin D. Corbett () and Don W. Cleveland ()
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Dong Hyun Kim: San Diego Branch
Joo Seok Han: Institute for Basic Science (IBS)
Peter Ly: San Diego Branch
Qiaozhen Ye: University of California-San Diego
Moira A. McMahon: San Diego Branch
Kyungjae Myung: Institute for Basic Science (IBS)
Kevin D. Corbett: University of California-San Diego
Don W. Cleveland: San Diego Branch

Nature Communications, 2018, vol. 9, issue 1, 1-11

Abstract: Abstract The mitotic checkpoint ensures accurate chromosome segregation through assembly of the mitotic checkpoint complex (MCC), a soluble inhibitor of the anaphase-promoting complex/cyclosome (APC/C) produced by unattached kinetochores. MCC is also assembled during interphase by Mad1/Mad2 bound at nuclear pores, thereby preventing premature mitotic exit prior to kinetochore maturation and checkpoint activation. Using degron tagging to rapidly deplete the AAA+ ATPase TRIP13, we show that its catalytic activity is required to maintain a pool of open-state Mad2 for MCC assembly, thereby supporting mitotic checkpoint activation, but is also required for timely mitotic exit through catalytic disassembly of MCC. Strikingly, combining TRIP13 depletion with elimination of APC15-dependent Cdc20 ubiquitination/degradation results in a complete inability to exit mitosis, even when MCC assembly at unattached kinetochores is prevented. Thus, mitotic exit requires MCC produced either in interphase or mitosis to be disassembled by TRIP13-catalyzed removal of Mad2 or APC15-driven ubiquitination/degradation of its Cdc20 subunit.

Date: 2018
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DOI: 10.1038/s41467-018-06774-1

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