Involved in proteasome-mediated ubiquitin-dependent protein catabolic process. Located in dendrite. Part of proteasome regulatory particle. Is expressed in several structures, including adult head; adult heart; anterior endoderm; embryonic/larval midgut primordium; and ganglia. Used to study congenital heart disease; metabolic dysfunction-associated steatotic liver disease; and neurodegenerative disease. Orthologous to human PSMD7 (proteasome 26S subunit, non-ATPase 7).