abstract:All-trans-nonaprenyl-diphosphate synthase (geranyl-diphosphate specific) (, nonaprenyl diphosphate synthase, solanesyl diphosphate synthase, SolPP synthase, SPP-synthase, SPP synthase, solanesyl-diphosphate synthase, OsSPS2) is an enzyme with system name geranyl-diphosphate:isopentenyl-diphosphate transtransferase (adding 7 isopentenyl units). This enzyme catalyses the following chemical reaction