E3 ubiquitin-protein ligase that may be involved in positive regulation of programmed cell death (PCD) by facilitating degradation of negative regulators of PCD. May be involved in the early steps of the plant defense signaling pathway. Undergoes auto-ubiquitination. 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. Up-regulated by chitin. Up-regulated by the fungal toxin fumonisin B1 (FB1) treatment and pathogen infection. The RING-type zinc finger domain mediates binding to an E2 ubiquitin-conjugating enzyme. Auto-ubiquitinated. Hyposensitivity to the fungal toxin fumonisin B1 (FB1). Belongs to the RING-type zinc finger family. ATL subfamily.