E3 ubiquitin-protein ligase SMURF2 (SMURF2)

E3 ubiquitin-protein ligase which accepts ubiquitin from an E2 ubiquitin-conjugating enzyme in the form of a thioester and then directly transfers the ubiquitin to targeted substrates. Interacts with SMAD1 and SMAD7 in order to activate their ubiquitination and proteasome-dependent degradation.

Additionally, interaction with SMAD7 activates autocatalytic degradation, which is avoided by interaction with SCYE1. Forms a stable complex with the TGF-beta receptor-mediated phosphorylated SMAD2 and SMAD3.