Send to

Choose Destination
Mol Biol Cell. 2018 Jul 1;29(13):1542-1554. doi: 10.1091/mbc.E17-04-0248. Epub 2018 May 9.

The E3 ubiquitin ligase UBR5 regulates centriolar satellite stability and primary cilia.

Author information

Garvan Institute of Medical Research, Kinghorn Cancer Centre, Darlinghurst 2010, Australia.
Faculty of Medicine, St. Vincent's Clinical School, University of New South Wales, Sydney 2052, Australia.
Department of Radiation Biology, Institute for Cancer Research, Norwegian Radium Hospital, Oslo University Hospital, 0310 Oslo, Norway.
Faculty of Medicine, School of Medical Sciences, University of New South Wales, Sydney 2052, Australia.


Primary cilia are crucial for signal transduction in a variety of pathways, including hedgehog and Wnt. Disruption of primary cilia formation (ciliogenesis) is linked to numerous developmental disorders (known as ciliopathies) and diseases, including cancer. The ubiquitin-proteasome system (UPS) component UBR5 was previously identified as a putative positive regulator of ciliogenesis in a functional genomics screen. UBR5 is an E3 ubiquitin ligase that is frequently deregulated in tumors, but its biological role in cancer is largely uncharacterized, partly due to a lack of understanding of interacting proteins and pathways. We validated the effect of UBR5 depletion on primary cilia formation using a robust model of ciliogenesis, and identified CSPP1, a centrosomal and ciliary protein required for cilia formation, as a UBR5-interacting protein. We show that UBR5 ubiquitylates CSPP1, and that UBR5 is required for cytoplasmic organization of CSPP1-comprising centriolar satellites in centrosomal periphery, suggesting that UBR5-mediated ubiquitylation of CSPP1 or associated centriolar satellite constituents is one underlying requirement for cilia expression. Hence, we have established a key role for UBR5 in ciliogenesis that may have important implications in understanding cancer pathophysiology.

[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Atypon Icon for PubMed Central Icon for Norwegian BIBSYS system
Loading ...
Support Center