RING-type ubiquitin E3 ligase that binds ubiquitin and is required for seed germination and post-germination growth. 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. Component of the heteromeric E3 ligase complex made of BRIZ1 and BRIZ2 (PubMed:20810661). Forms heterooligomers with BRIZ1 via coiled-coil domains (PubMed:20810661). Viable heterozygous plants seeds are slow to emerge from the seed coat; emerged embryos remains white with unexpanded cotyledons thus leading to growth-arrested seedlings.