Geranylfarnesyl diphosphate synthase (, FGPP synthase, (all-E) geranylfarnesyl diphosphate synthase, GFPS, Fgs) is an enzyme with systematic name geranylgeranyl-diphosphate:isopentenyl-diphosphate transtransferase (adding 1 isopentenyl unit). This enzyme catalyses the following chemical reaction
geranylgeranyl diphosphate + isopentenyl diphosphate (2E,6E,10E,14E)-geranylfarnesyl diphosphate + diphosphate
The enzyme from Methanosarcina mazei is involved in biosynthesis of the polyprenyl side-chain of methanophenazine.
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