E3 ubiquitin-protein ligase that specifically binds poly-ADP-ribosylated proteins and mediates their ubiquitination and subsequent degradation. Acts as an activator of the Wnt signaling pathway by mediating the ubiquitination of poly-ADP-ribosylated AXIN1 and AXIN2, 2 key components of the beta-catenin destruction complex. Acts in cooperation with tankyrase proteins (TNKS and TNKS2), which mediate poly-ADP-ribosylation of target proteins AXIN1, AXIN2, BLZF1, CASC3, TNKS and TNKS2. Recognizes and binds tankyrase-dependent poly-ADP-ribosylated proteins via its WWE domain and mediates their ubiquitination (By similarity). S-ubiquitinyl-[E2 ubiquitin-conjugating enzyme]-L-cysteine + [acceptor protein]-L-lysine = [E2 ubiquitin-conjugating enzyme]-L-cysteine + N(6)-ubiquitinyl-[acceptor protein]-L-lysine. Protein modification; protein ubiquitination. Interacts with poly-ADP-ribosylated AXIN1, AXIN2, BLZF1 and CASC3. The WWE domain mediates non-covalent poly(ADP-ribose)-binding. Ubiquitinated; autoubiquitinated. Autoubiquitination is enhanced upon poly(ADP-ribose)-binding (By similarity).