Enables ubiquitin protein ligase activity. Involved in antigen processing and presentation of peptide antigen via MHC class II; immune response; and protein polyubiquitination. Located in bounding membrane of organelle; endoplasmic reticulum membrane; and trans-Golgi network membrane. Is expressed in central nervous system. Orthologous to human MARCHF1 (membrane associated ring-CH-type finger 1). [provided by Alliance of Genome Resources, Apr 2022]