Abstract
A novel prenyltransferase, farnesylgeranyl diphosphate (FGPP) synthase (EC 2.5.1.X), which synthesizes C 25-prenyl diphosphate, was found in the haloalkaliphilic archaeon Natronobacterium pharaonis. It was separated from geranylgeranyl diphosphate (GGPP) synthase (EC 2.5.1.29), which synthesizes C 20-prenyl diphosphate, a major prenyltransferase in this organism. The highest activity of FGPP synthase was observed when GGPP was used as the allylic substrate. FGPP synthase may synthesize a precursor for the C 25 moiety of C 20,C 25 diether lipids using a longer allylic diphosphate, such as GGPP synthesized by GGPP synthase, rather than dimethylallyl diphosphate, which is the product of isopentenyl diphosphate isomerase.
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