geranyltranstransferase activity Catalysis of the reaction: geranyl diphosphate + isopentenyl diphosphate = 2-trans,6-trans-farnesyl diphosphate + diphosphate. farnesyl pyrophosphate synthetase activity farnesyl-diphosphate synthase activity Reactome:REACT_106937 Reactome:REACT_32332 Reactome:REACT_32096 Reactome:REACT_86369 Reactome:REACT_110008 farnesylpyrophosphate synthetase activity geranyl transferase I Reactome:REACT_9451 FPP synthetase activity molecular_function Reactome:REACT_96641 Reactome:REACT_106226 Reactome:REACT_95036 Reactome:REACT_99168 Reactome:REACT_87629 Reactome:REACT_95560 GO:0004337 KEGG:R02003 Note that this is the second step in the formation of farnesyl diphosphate. The first step is 'dimethylallyltransferase activity ; GO:0004161'. Consider also annotating to the biological process term 'farnesyl diphosphate biosynthetic process ; GO:0045337'. Reactome:REACT_80399 Reactome:REACT_80850 MetaCyc:FPPSYN-RXN EC:2.5.1.10 Reactome:REACT_82492 geranyltransferase activity RHEA:19364 Reactome:REACT_108353 geranyl-diphosphate:isopentenyl-diphosphate geranyltranstransferase activity Reactome:REACT_31479 Reactome:REACT_106273 farnesyl diphosphate synthetase activity prenyltransferase activity