E3 ubiquitin-protein ligase that mediates the formation of 'Lys-63'-linked ubiquitin chains. Regulates apical dominance by acting on the auxin transport proteins abundance (PubMed:17586653). Mediates ubiquitination and subsequent proteasomal degradation of ERF053 in response to drought stress. Acts as a negative regulator of drought stress response (PubMed:22095047). 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. Interacts with the heterodimer UBC35/UEV1B, UBC35 alone, PIN1, but not with UCB2, UCB9, UEV1B or UEV1C alone (PubMed:17586653). Interacts with ERF053 (PubMed:22095047). Translocates to the nucleus under salt stress. Ubiquitously expressed. A C-terminal fragment containing the RING domain interacts with UBC35 while the full-length protein does not. N-myristoylated. No visible phenotype; due to the redundancy with RGLG1 (PubMed:17586653, PubMed:22095047). Rglg1 and rglg2 double mutants show a complete loss of apical dominance (PubMed:17586653). The double mutant seedlings rglg1 and rglg2 exhibit a dehydration-tolerant phenotype (PubMed:22095047).