Predicted to enable GTPase activator activity and small GTPase binding activity. Involved in positive regulation of protein catabolic process. Located in gap junction. Is expressed in several structures, including central nervous system; ear; ganglia; lung; and submandibular gland primordium. Orthologous to human SGSM3 (small G protein signaling modulator 3). [provided by Alliance of Genome Resources, Apr 2022]