Enables protein heterodimerization activity. Contributes to trans-hexaprenyltranstransferase activity and trans-octaprenyltranstransferase activity. Involved in cerebellum development; isoprenoid biosynthetic process; and ubiquinone biosynthetic process. Acts upstream of or within regulation of body fluid levels. Located in mitochondrion. Part of transferase complex. Is expressed in endocrine gland; genitourinary system; nervous system; skin; and stomach. Used to study coenzyme Q10 deficiency disease. Human ortholog(s) of this gene implicated in primary coenzyme Q10 deficiency 3. Orthologous to human PDSS2 (decaprenyl diphosphate synthase subunit 2). [provided by Alliance of Genome Resources, Apr 2022]