E3 ubiquitin-protein ligase that plays a role in the control of mitochondrial morphology. Promotes mitochondrial fragmentation and influences mitochondrial localization. Inhibits cell growth. When overexpressed, activates JNK through MAP3K7/TAK1 and induces caspase-dependent apoptosis. E3 ubiquitin ligases accept ubiquitin from an E2 ubiquitin-conjugating enzyme in the form of a thioester and then directly transfer the ubiquitin to targeted substrates.Synonyms: C1orf166, E3 ubiquitin-protein ligase MUL1, GIDE, Growth inhibition and death E3 ligase, MAPL, MULAN, Mitochondrial ubiquitin ligase activator of NFKB 1, Mitochondrial-anchored protein ligase, Putative NF-kappa-B-activating protein 266, RING finger protein 218