catalytic activity:Dimethylallyl diphosphate + isopentenyl diphosphate = diphosphate + geranyl diphosphate.,catalytic activity:Geranyl diphosphate + isopentenyl diphosphate = diphosphate + trans,trans-farnesyl diphosphate.,catalytic activity:Trans,trans-farnesyl diphosphate + isopentenyl diphosphate = diphosphate + geranylgeranyl diphosphate.,function:Catalyzes the trans-addition of the three molecules of IPP onto DMAPP to form geranylgeranyl pyrophosphate, an important precursor of carotenoids and geranylated proteins.,pathway:Isoprenoid biosynthesis; farnesyl-PP biosynthesis; farnesyl-PP from geranyl-PP and isopentenyl-PP: step 1/1.,pathway:Isoprenoid biosynthesis; geranyl-PP biosynthesis; geranyl-PP from dimethylallyl-PP and isopentenyl-PP: step 1/1.,pathway:Isoprenoid biosynthesis; geranylgeranyl-PP biosynthesis; geranylgeranyl-PP from farnesyl-PP and isopentenyl-PP: step 1/1.,similarity:Belongs to the FPP/GGPP synthetase family.,subunit:Homooctamer.,tissue specificity:Abundantly expressed in testis. Found in other tissues to a lower extent.,
Cytoplasm.
Abundantly expressed in testis. Found in other tissues to a lower extent.
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