Predicted to enable ubiquitin-protein transferase activity. Predicted to be involved in Notch signaling pathway; cellular protein metabolic process; and endocytosis. Predicted to act upstream of or within several processes, including chordate embryonic development; circulatory system development; and positive regulation of endocytosis. Located in postsynaptic density. Human ortholog(s) of this gene implicated in left ventricular noncompaction. Orthologous to human MIB1 (MIB E3 ubiquitin protein ligase 1). [provided by Alliance of Genome Resources, Apr 2022]