Nuclear pores protect genome integrity by assembling a premitotic and mad1-dependent anaphase inhibitor

Veronica Rodriguez-Bravo, John Maciejowski, Jennifer Corona, Håkon Kirkeby Buch, Philippe Collin, Masato T. Kanemaki, Jagesh V. Shah, Prasad V. Jallepalli

Research output: Contribution to journalArticlepeer-review


The spindle assembly checkpoint (SAC) delays anaphase until all chromosomes are bioriented on the mitotic spindle. Under current models, unattached kinetochores transduce the SAC by catalyzing the intramitotic production of a diffusible inhibitor of APC/CCdc20 (the anaphase-promoting complex/cyclosome and its coactivator Cdc20, a large ubiquitin ligase). Here we show that nuclear pore complexes (NPCs) in interphase cells also function as scaffolds for anaphase-inhibitory signaling. This role is mediated by Mad1-Mad2 complexes tethered to the nuclear basket, which activate soluble Mad2 as a binding partner and inhibitor of Cdc20 in the cytoplasm. Displacing Mad1-Mad2 from nuclear pores accelerated anaphase onset, prevented effective correction of merotelic errors, and increased the threshold of kinetochore-dependent signaling needed to halt mitosis in response to spindle poisons. A heterologous Mad1-NPC tether restored Cdc20 inhibitor production and normal M phase control. We conclude that nuclear pores and kinetochores both emit "wait anaphase" signals that preserve genome integrity.

Original languageEnglish (US)
Pages (from-to)1017-1031
Number of pages15
Issue number5
StatePublished - Feb 27 2014

ASJC Scopus subject areas

  • General Biochemistry, Genetics and Molecular Biology


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