An Inhibitor of PIDDosome Formation

Ruth Thompson, Richa B. Shah, Peter H. Liu, Yogesh K. Gupta, Kiyohiro Ando, Aneel K. Aggarwal, Samuel Sidi

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


The PIDDosome-PIDD-RAIDD-caspase-2 complex-is a proapoptotic caspase-activation platform of elusive significance. DNA damage can initiate complex assembly via ATM phosphorylation of the PIDD death domain (DD), which enables RAIDD recruitment to PIDD. In contrast, the mechanisms limiting PIDDosome formation have remained unclear. We identify the mitotic checkpoint factor BubR1 as a direct PIDDosome inhibitor, acting in a noncanonical role independent of Mad2. Following its phosphorylation by ATM at DNA breaks, "primed" PIDD relocates to kinetochores via a direct interaction with BubR1. BubR1 binds the PIDD DD, competes with RAIDD recruitment, and negates PIDDosome-mediated apoptosis after ionizing radiation. The PIDDosome thus sequentially integrates DNA damage and mitotic checkpoint signals to decide cell fate in response to genotoxic stress. We further show that by sequestering PIDD at the kinetochore, BubR1 acts to delay PIDDosome formation until the next cycle, defining a new mechanism by which cells evade apoptosis during mitosis.

Original languageEnglish (US)
Pages (from-to)767-779
Number of pages13
JournalMolecular Cell
Issue number5
StatePublished - Sep 18 2014
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology


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