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The SCF-type E3 Ubiquitin Ligases as Cancer Targets

[ Vol. 16 , Issue. 2 ]


Kyoko Kitagawa and Masatoshi KitagawaPages 119-129 (11)


The ubiquitin system controls protein stability and function. F-box proteins form SCF (SKP1-Cullin1-F-box protein)-type ubiquitin (E3) ligases to selectively target their substrates for degradation via the ubiquitin–proteasome pathway. Here, we review F-box proteins associated with cancer development. S-phase kinase-associated protein 2 (SKP2) (also known as FBXL1) is often overexpressed in human cancers, and functions as an oncogenic E3 ligase to degrade tumor suppressor gene products. Moreover, F-box/WD repeat-containing protein 7 (FBXW7) (also known as Fbw7) is often mutated in human cancers and functions as a tumor suppressive E3 ligase targeting oncogenic proteins for degradation. SKP2 is a potential drug target for cancer therapy and FBXW7 is useful in determining patient diagnosis, prognosis, and drug sensitivity. In this review, we also discuss other F-box proteins involved in cancer-associated cellular processes such as cell cycle control, epigenetic regulation, epithelial mesenchymal transition, apoptosis/survival, drug resistance, and DNA-damage responses.


β-TrCP, E3 ligase, F-box protein, FBXW7, human cancer, proteasome, SCF complex, SKP2, ubiquitin.


Department of Molecular Biology, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu 431-3192, Japan.

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