E2F1 binds to the peptide-binding groove within the BIR3 domain of cIAP1 and requires cIAP1 for chromatin binding - Université de Bourgogne Accéder directement au contenu
Article Dans Une Revue PLoS ONE Année : 2018

E2F1 binds to the peptide-binding groove within the BIR3 domain of cIAP1 and requires cIAP1 for chromatin binding

Jennifer Allègre
  • Fonction : Auteur
Jessy Cartier
  • Fonction : Auteur
Valérie Glorian
  • Fonction : Auteur
Baptiste Dumetier
  • Fonction : Auteur
Cémile Kayaci
  • Fonction : Auteur
Jean Berthelet
  • Fonction : Auteur
Simon Gemble
  • Fonction : Auteur
Céline Vuillier
  • Fonction : Auteur
Laurent Maillet
  • Fonction : Auteur
Carmen Garrido
  • Fonction : Auteur

Résumé

The cellular inhibitor of apoptosis 1 (cIAP1) is an E3-ubiquitin ligase that regulates cell signaling pathways involved in fundamental cellular processes including cell death, cell proliferation, cell differentiation and inflammation. It recruits ubiquitination substrates thanks to the presence of three baculoviral IAP repeat (BIR) domains at its N-terminal extremity. We previously demonstrated that cIAP1 promoted the ubiquitination of the E2 factor 1 (E2F1) transcription factor. Moreover, we showed that cIAP1 was required for E2F1 stabilization during the S phase of cell cycle and in response to DNA damage. Here, we report that E2F1 binds within the cIAP1 BIR3 domain. The BIR3 contains a surface hydrophobic groove that specifically anchors a conserved IAP binding motif (IBM) found in a number of intracellular proteins including Smac. The Smac N-7 peptide that includes the IBM, as well as a Smac mimetic, competed with E2F1 for interaction with cIAP1 demonstrating the importance of the BIR surface hydrophobic groove. We demonstrated that the first alpha-helix of BIR3 was required for E2F1 binding, as well as for the binding of Smac and Smac mimetics. Overexpression of cIAP1 modified the ubiquitination profile of E2F1, increasing the ratio of E2F1 conjugated with K11- and K63-linked ubiquitin chains, and decreasing the proportion of E2F1 modified by K48-linked ubiquitin chains. ChIP-seq analysis demonstrated that cIAP1 was required for the recruitment of E2F1 onto chromatin. Lastly, we identified an E2F-binding site on the cIAP1-encoding birc2 gene promoter, suggesting a retro-control regulation loop.
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halshs-04468274 , version 1 (19-03-2024)

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Jennifer Allègre, Jessy Cartier, Valérie Glorian, Nathalie Droin, Baptiste Dumetier, et al.. E2F1 binds to the peptide-binding groove within the BIR3 domain of cIAP1 and requires cIAP1 for chromatin binding. PLoS ONE, 2018, 13 (10), pp.e0206253. ⟨10.1371/journal.pone.0206253⟩. ⟨halshs-04468274⟩
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