title: Biosynthesis of trans,trans,trans-geranylgeranyl diphosphate by the cytosolic fraction from rat tissues.
abstract: The cytosolic fractions from rat liver, brain, kidney, spleen and testis demonstrate the capacity to synthesize two products from [3H]isopentenyl diphosphate, i.e., farnesyl diphosphate and geranylgeranyl diphosphate. The highest rate of geranylgeranyl diphosphate synthesis was found in brain, testis and spleen, accounting for up to 30% of the total incorporation of radioactivity under optimal conditions. In all tissues examined the geranylgeranyl diphosphate formed was identified as the trans,trans,trans-isomer. The ratio of geranylgeranyl diphosphate to farnesyl diphosphate produced was specific for the tissue investigated and could be altered by the addition of divalent cations. The results in this study demonstrate the presence of a specific trans,trans,trans-geranylgeranyl diphosphate synthetase showing high affinity for farnesyl diphosphate.
authors.affiliation: Department of Biochemistry, Stockholm University, Sweden.
authors.forename: M
authors.initials: M
authors.lastname: Runquist
authors.forename: J
authors.initials: J
authors.lastname: Ericsson
authors.forename: A
authors.initials: A
authors.lastname: Thelin
authors.forename: T
authors.initials: T
authors.lastname: Chojnacki
authors.forename: G
authors.initials: G
authors.lastname: Dallner
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism*; D002413:Cations, Divalent / Q000494:pharmacology; D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D003600:Cytosol / Q000378:metabolism; D045782:Hemiterpenes; D007536:Isomerism; D007668:Kidney / Q000378:metabolism*; D007700:Kinetics; D008099:Liver / Q000378:metabolism*; D008297:Male; D009928:Organ Specificity; D009943:Organophosphorus Compounds / Q000378:metabolism*; D011106:Polyisoprenyl Phosphates / Q000096:biosynthesis* / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D012717:Sesquiterpenes; D013154:Spleen / Q000378:metabolism*; D013737:Testis / Q000378:metabolism*; D014316:Tritium
chemical_list: D002413:Cations, Divalent; D045782:Hemiterpenes; D009943:Organophosphorus Compounds; D011106:Polyisoprenyl Phosphates; D012717:Sesquiterpenes; D014316:Tritium; C004809:isopentenyl pyrophosphate; C004808:farnesyl pyrophosphate; C002963:geranylgeranyl pyrophosphate