Proteomic screen reveals Fbw7 as a modulator of the NF-κB pathway

Azadeh Arabi, Karim Ullah, Rui M. M. Branca, Johan Johansson, Daniel Bandarra, Moritz Haneklaus, Jing Fu, Ingrid Ariës, Peter Nilsson, Monique L. Den Boer, Katja Pokrovskaja, Dan Grandér, Gutian Xiao, Sonia Rocha, Janne Lehtiö, Olle Sangfelt

    Research output: Contribution to journalArticlepeer-review

    74 Citations (Scopus)


    Fbw7 is a ubiquitin-ligase that targets several oncoproteins for proteolysis, but the full range of Fbw7 substrates is not known. Here we show that by performing quantitative proteomics combined with degron motif searches, we effectively screened for a more complete set of Fbw7 targets. We identify 89 putative Fbw7 substrates, including several disease-associated proteins. The transcription factor NF-?B2 (p100/p52) is one of the candidate Fbw7 substrates. We show that Fbw7 interacts with p100 via a conserved degron and that it promotes degradation of p100 in a GSK3 2 phosphorylation-dependent manner. Fbw7 inactivation increases p100 levels, which in the presence of NF-?B pathway stimuli, leads to increased p52 levels and activity. Accordingly, the apoptotic threshold can be increased by loss of Fbw7 in a p100-dependent manner. In conclusion, Fbw7-mediated destruction of p100 is a regulatory component restricting the response to NF-?B2 pathway stimulation.
    Original languageEnglish
    Article number976
    JournalNature Communications
    Publication statusPublished - 2012


    • Cell Cycle Proteins
    • Cell Line
    • Cell Line, Tumor
    • Computational Biology
    • F-Box Proteins
    • Glycogen Synthase Kinase 3
    • Humans
    • Immunoblotting
    • Immunoprecipitation
    • NF-kappa B p52 Subunit
    • Phosphorylation
    • Proteomics
    • Signal Transduction
    • Tandem Mass Spectrometry
    • Ubiquitin-Protein Ligases


    Dive into the research topics of 'Proteomic screen reveals Fbw7 as a modulator of the NF-κB pathway'. Together they form a unique fingerprint.

    Cite this