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The E3 ubiquitin ligase complex component COP1 regulates PEA3 group member stability and transcriptional activity

Oncogene volume 29, pages 1810–1820 (2010)Cite this article

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Abstract

In this study, we report that the PEA3 group members interact with the mammalian really interesting new gene (RING) E3 ubiquitin ligase constitutive photomorphogenetic 1 (COP1), which mediates ubiquitylation and subsequent proteasome degradation of the p53 and c-Jun transcription factors. This interaction is mediated by the central region of COP1 including the coiled-coil domain and two COP1-interacting consensus motifs localized in the well-conserved N-terminal transactivation domain of the PEA3 group members. At the transcriptional level, COP1 reduces the transcriptional activity of ERM and the two other PEA3 group proteins on Ets-responsive reporter genes; this effect being dependent on the RING domain of COP1 and the two COP1-interacting motifs of ERM. Reduced transcriptional activity was, however, not related to COP1-induced changes in ERM stability. In fact, increased ubiquitylation and subsequent proteasome-mediated degradation of ERM is achieved only when COP1 is expressed with DET1, a key COP1 partner within the ubiquitylation complex. Conversely, we show that the depletion of COP1 or DET1 by small interference RNA (siRNA) in U2OS cells stabilizes endogenous ERM whereas only COP1 knockdown enhances expression of ICAM-1, a gene regulated by this transcription factor. These results indicate that COP1 is a complex regulator of ERM and the two other PEA3 group members.

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Acknowledgements

This work was carried out thanks to grants awarded by the ‘Ligue Nationale Contre le Cancer’ (Comité Nord, France), the ‘Association pour la Recherche contre le Cancer’ (France), the ‘Conseil Régional Nord/Pas-de-Calais’ (France) and the European Regional Development Fund (Intergenes program). We thank E Bianchi and VM Dixit for kind gifts of plasmids.

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Authors and Affiliations

  1. CNRS UMR 8161, Institut de Biologie de Lille, Université de Lille—Nord de France, Institut Pasteur de Lille, Lille Cedex, France

    J-L Baert, D Monte, K Verreman, C Degerny, L Coutte & Y de Launoit

  2. CNRS FRE 2944, Institut André Lwoff, Université Paris Sud, Villejuif, France

    C Degerny

  3. Laboratoire de Biologie Animale Bâtiment 470, Faculté des Sciences d’Orsay, Université Paris Sud, Orsay, France

    L Coutte

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  1. J-L Baert
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  2. D Monte
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  4. C Degerny
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  5. L Coutte
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  6. Y de Launoit
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Correspondence to J-L Baert or Y de Launoit.

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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc)

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Baert, JL., Monte, D., Verreman, K. et al. The E3 ubiquitin ligase complex component COP1 regulates PEA3 group member stability and transcriptional activity. Oncogene 29, 1810–1820 (2010). https://doi.org/10.1038/onc.2009.471

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