ID 2.5.1.158 DE hexaprenyl diphosphate synthase (prenyl-diphosphate specific). AN HexPPS. CA 5 isopentenyl diphosphate + dimethylallyl diphosphate = all-trans- CA hexaprenyl diphosphate + 5 diphosphate. CC -!- This activity has been characterized from a number of fungal CC bifunctional enzymes. CC -!- Following the formation of hexaprenyl diphosphate, a different domain CC in the enzymes catalyzes its cyclization into a triterpene (see CC EC 4.2.3.221 and EC 4.2.3.220). cf. EC 2.5.1.82. DR A0A8H4CUY8, CGCS_COLGL ; K2SUY0, MPMS_MACPH ; P9WER5, TVTS_TALVE ; //