E3 ubiquitin protein ligase that acts as positive regulator of RPM1- and RPS2-dependent hypersensitive response (HR), in association with RIN2. Probably not required for RPM1 degradation during HR. 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 (via C-terminus) with RPM1 (via N-terminus). A number of isoforms are produced. According to EST sequences. Repressed upon infection with the P.syringae avirulent DC3000 strain containing avrRpm1 (at protein level). No visible phenotype.