E3 ubiquitin-protein ligase that acts as a regulator of cell death and defense. E3 ubiquitin ligases accept ubiquitin from an E2 ubiquitin-conjugating enzyme in the form of a thioester and then directly transfers the ubiquitin to targeted substrates. Attenuates the activation of defense and related cell death responses in the absence of pathogens by mediating ubiquitination and subsequent proteasomal degradation of MYB30. 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 MYB30 (PubMed:23403577). Interacts with GILP (PubMed:21526181). Autoubiquitinated.