Protein
Geranylfarnesyl diphosphate synthase
Organism
Natronomonas pharaonis (strain ATCC 35678 / DSM 2160 / CIP 103997 / NBRC 14720 / NCIMB 2260 / Gabara)
Function
Probably involved in biosynthesis of the precursor for C25 (sesterterpanyl chain) moiety of C20-C25 diether (2-O-sesterterpanyl-3-O-phytanyl-sn-glycer) membrane lipid. Catalyzes the condensation of isopentenyl pyrophosphate with the allylic pyrophosphates to yield geranylfarnesyl diphosphate (GFPP). Geranylgeranyl diphosphate (GGPP) is the preferred substrate, but dimethylallyl diphosphate (DMAPP) and farnesyl diphosphate (FPP) can also be used as allylic substrate.
Similarity
Belongs to the FPP/GGPP synthase family.
Sequence
MTSADHVESAIAERREIVNEAVSEQLPVQKPERLYSASRYLLDAGGKRLRPTILLLAAESLADVEPLSADYRQFPSLPGDEVDVLSAAVSIEVIQSFTLIHDDIMDDDDLRRGVPAVHREYDLETAILAGDTLYSKAFEYMLDTGAPAERSVEALDELATTCTEICEGQALDVDFENRSDVTTEEYLEMVEFKTAVLYAAAASIPAILLGSDDETVEALHGYGLDIGRAFQIQDDLLDLTAPSDELGKQRGSDLVENKRTVITLHARDQGIDVEGLVSDDPSDAEIEAAVQTLEDAGSIDFAREMALDLVTSGKERLDVLPENEARQLLEDIADFLVERSY