IAP antagonists induce autoubiquitination of c-IAPs, NF-kappaB activation, and TNFalpha-dependent apoptosis

Eugene Varfolomeev, John W Blankenship, Sarah M Wayson, Anna V Fedorova, Nobuhiko Kayagaki, Parie Garg, Kerry Zobel, Jasmin N Dynek, Linda O Elliott, Heidi J A Wallweber, Johan Flygare, Wayne J Fairbrother, Kurt Deshayes, V Dixit

Research output: Contribution to journalArticlepeer-review

Abstract

Inhibitor of apoptosis (IAP) proteins are antiapoptotic regulators that block cell death in response to diverse stimuli. They are expressed at elevated levels in human malignancies and are attractive targets for the development of novel cancer therapeutics. Herein, we demonstrate that small-molecule IAP antagonists bind to select baculovirus IAP repeat (BIR) domains resulting in dramatic induction of auto-ubiquitination activity and rapid proteasomal degradation of c-IAPs. The IAP antagonists also induce cell death that is dependent on TNF signaling and de novo protein biosynthesis. Additionally, the c-IAP proteins were found to function as regulators of NF-kappaB signaling. Through their ubiquitin E3 ligase activities c-IAP1 and c-IAP2 promote proteasomal degradation of NIK, the central ser/thr kinase in the noncanonical NF-kappaB pathway.
Original languageEnglish
Pages (from-to)669
JournalCell
Volume131
Issue number4
DOIs
Publication statusPublished - 2007
Externally publishedYes

Subject classification (UKÄ)

  • Hematology

Fingerprint

Dive into the research topics of 'IAP antagonists induce autoubiquitination of c-IAPs, NF-kappaB activation, and TNFalpha-dependent apoptosis'. Together they form a unique fingerprint.

Cite this