E3 ubiquitin-protein ligase that promotes the ubiquitination and proteasomal degradation of the auxin-binding protein ERABP1. 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 ERABP1. Barely detected in roots and limited to the root tips. Expressed in leaf hydathodes and in siliques. Expressed during seed development. The RING-type zinc finger domain is required for E3 ligase activity. No visible phenotype and no effect on drought stress response, probably due to the redundancy with RMA1 and RMA3.