May be involved in both secretory and endocytic intracellular trafficking in the endosomal/prevacuolar compartments. Interacts with PRA1B1, PRA1B2, PRA1B3, PRA1B4, PRA1B5 and PRA1B6. Expressed in hypocotyls, roots, lateral roots, columella cells, leaves and shoot apex. Belongs to the PRA1 family.