Enables protein heterodimerization activity and protein homodimerization activity. Involved in positive regulation of cellular component biogenesis; positive regulation of protein phosphorylation; and regulation of transcription by RNA polymerase III. Located in several cellular components, including extracellular region; nucleus; and perinuclear region of cytoplasm. Is integral component of plasma membrane. Is expressed in several structures, including alimentary system; genitourinary system; nervous system; respiratory system; and sensory organ. Orthologous to human TENM1 (teneurin transmembrane protein 1). [provided by Alliance of Genome Resources, Apr 2022]