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CDK-mediated activation of the SCFFBXO28 ubiquitin ligase promotes MYC-driven transcription and tumourigenesis and predicts poor survival in breast cancer
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2013 (English)In: EMBO Molecular Medicine, ISSN 1757-4676, E-ISSN 1757-4684, Vol. 5, no 7, 999-1018 p.Article in journal (Refereed) Published
Abstract [en]

SCF (Skp1/Cul1/F-box) ubiquitin ligases act as master regulators of cellular homeostasis by targeting key proteins for ubiquitylation. Here, we identified a hitherto uncharacterized F-box protein, FBXO28 that controls MYC-dependent transcription by non-proteolytic ubiquitylation. SCFFBXO28 activity and stability are regulated during the cell cycle by CDK1/2-mediated phosphorylation of FBXO28, which is required for its efficient ubiquitylation of MYC and downsteam enhancement of the MYC pathway. Depletion of FBXO28 or overexpression of an F-box mutant unable to support MYC ubiquitylation results in an impairment of MYC-driven transcription, transformation and tumourigenesis. Finally, in human breast cancer, high FBXO28 expression and phosphorylation are strong and independent predictors of poor outcome. In conclusion, our data suggest that SCFFBXO28 plays an important role in transmitting CDK activity to MYC function during the cell cycle, emphasizing the CDK-FBXO28-MYC axis as a potential molecular drug target in MYC-driven cancers, including breast cancer. FBXO28 is identified as part of a SCF complex acting as a regulator of tumor cell proliferation and an important modifier of MYC function. FBXO28 may be a new prognostic factor in breast cancer and a new potential drug target in MYC- driven tumors.

Place, publisher, year, edition, pages
2013. Vol. 5, no 7, 999-1018 p.
Keyword [en]
Breast cancer, CDK, F-box protein, FBXO28, MYC
National Category
Medical Biotechnology
URN: urn:nbn:se:kth:diva-134164DOI: 10.1002/emmm.201202341ISI: 000325942300009ScopusID: 2-s2.0-84880026012OAI: diva2:665557
Swedish Cancer SocietySwedish Research CouncilKnut and Alice Wallenberg Foundation

QC 20131120

Available from: 2013-11-20 Created: 2013-11-18 Last updated: 2013-11-29Bibliographically approved

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Al-Khalili Szigyarto, CristinaUhlén, Mathias
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