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2017 ; 67
(2
): 181-193.e5
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Wnt-Dependent Inactivation of the Groucho/TLE Co-repressor by the HECT
E3 Ubiquitin Ligase Hyd/UBR5
#MMPMID28689657
Flack JE
; Mieszczanek J
; Novcic N
; Bienz M
Mol Cell
2017[Jul]; 67
(2
): 181-193.e5
PMID28689657
show ga
Extracellular signals are transduced to the cell nucleus by effectors that bind
to enhancer complexes to operate transcriptional switches. For example, the Wnt
enhanceosome is a multiprotein complex associated with Wnt-responsive enhancers
through T cell factors (TCF) and kept silent by Groucho/TLE co-repressors.
Wnt-activated ?-catenin binds to TCF to overcome this repression, but how it
achieves this is unknown. Here, we discover that this process depends on the HECT
E3 ubiquitin ligase Hyd/UBR5, which is required for Wnt signal responses in
Drosophila and human cell lines downstream of activated Armadillo/?-catenin. We
identify Groucho/TLE as a functionally relevant substrate, whose ubiquitylation
by UBR5 is induced by Wnt signaling and conferred by ?-catenin. Inactivation of
TLE by UBR5-dependent ubiquitylation also involves VCP/p97, an AAA ATPase
regulating the folding of various cellular substrates including ubiquitylated
chromatin proteins. Thus, Groucho/TLE ubiquitylation by Hyd/UBR5 is a key
prerequisite that enables Armadillo/?-catenin to activate transcription.