octaprenyl-diphosphate synthase (all-trans) catalyzes consecutive condensation reactions of one allylic substrate farnesyl pyrophosphate (FPP) and five homoallylic substrate isopentenyl pyrophosphate (IPP) molecules to form a C40 long-chain product OPP, which serves as a side chain of ubiquinone and menaquinone
Geranylgeranyl pyrophosphate synthase [Coenzyme transport and metabolism]; Geranylgeranyl ...
176-498
2.38e-152
Geranylgeranyl pyrophosphate synthase [Coenzyme transport and metabolism]; Geranylgeranyl pyrophosphate synthase is part of the Pathway/BioSystem: Isoprenoid biosynthesis
Pssm-ID: 439912 [Multi-domain] Cd Length: 329 Bit Score: 437.35 E-value: 2.38e-152
Trans-Isoprenyl Diphosphate Synthases, head-to-tail; These trans-Isoprenyl Diphosphate ...
202-496
3.66e-107
Trans-Isoprenyl Diphosphate Synthases, head-to-tail; These trans-Isoprenyl Diphosphate Synthases (Trans_IPPS) catalyze head-to-tail (HT) (1'-4) condensation reactions. This CD includes all-trans (E)-isoprenyl diphosphate synthases which synthesize various chain length (C10, C15, C20, C25, C30, C35, C40, C45, and C50) linear isoprenyl diphosphates from precursors, isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP). They catalyze the successive 1'-4 condensation of the 5-carbon IPP to allylic substrates geranyl-, farnesyl-, or geranylgeranyl-diphosphate. Isoprenoid chain elongation reactions proceed via electrophilic alkylations in which a new carbon-carbon single bond is generated through interaction between a highly reactive electron-deficient allylic carbocation and an electron-rich carbon-carbon double bond. The catalytic site consists of a large central cavity formed by mostly antiparallel alpha helices with two aspartate-rich regions (DDXX(XX)D) located on opposite walls. These residues mediate binding of prenyl phosphates via bridging Mg2+ ions, inducing proposed conformational changes that close the active site to solvent, protecting and stabilizing reactive carbocation intermediates. Farnesyl diphosphate synthases produce the precursors of steroids, cholesterol, sesquiterpenes, farnsylated proteins, heme, and vitamin K12; and geranylgeranyl diphosphate and longer chain synthases produce the precursors of carotenoids, retinoids, diterpenes, geranylgeranylated chlorophylls, ubiquinone, and archaeal ether linked lipids. Isoprenyl diphosphate synthases are widely distributed among archaea, bacteria, and eukareya.
Pssm-ID: 173833 Cd Length: 259 Bit Score: 319.50 E-value: 3.66e-107
heptaprenyl diphosphate synthase component II; Members of this family are component II of the ...
188-497
7.72e-63
heptaprenyl diphosphate synthase component II; Members of this family are component II of the heterodimeric heptaprenyl diphosphate synthase. The trusted cutoff was set such that all members identified are encoded near to a recognizable gene for component I (in pfam07307). This enzyme acts in menaquinone-7 isoprenoid side chain biosynthesis. [Biosynthesis of cofactors, prosthetic groups, and carriers, Menaquinone and ubiquinone]
Pssm-ID: 131795 Cd Length: 319 Bit Score: 207.26 E-value: 7.72e-63
Geranylgeranyl pyrophosphate synthase [Coenzyme transport and metabolism]; Geranylgeranyl ...
176-498
2.38e-152
Geranylgeranyl pyrophosphate synthase [Coenzyme transport and metabolism]; Geranylgeranyl pyrophosphate synthase is part of the Pathway/BioSystem: Isoprenoid biosynthesis
Pssm-ID: 439912 [Multi-domain] Cd Length: 329 Bit Score: 437.35 E-value: 2.38e-152
Trans-Isoprenyl Diphosphate Synthases, head-to-tail; These trans-Isoprenyl Diphosphate ...
202-496
3.66e-107
Trans-Isoprenyl Diphosphate Synthases, head-to-tail; These trans-Isoprenyl Diphosphate Synthases (Trans_IPPS) catalyze head-to-tail (HT) (1'-4) condensation reactions. This CD includes all-trans (E)-isoprenyl diphosphate synthases which synthesize various chain length (C10, C15, C20, C25, C30, C35, C40, C45, and C50) linear isoprenyl diphosphates from precursors, isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP). They catalyze the successive 1'-4 condensation of the 5-carbon IPP to allylic substrates geranyl-, farnesyl-, or geranylgeranyl-diphosphate. Isoprenoid chain elongation reactions proceed via electrophilic alkylations in which a new carbon-carbon single bond is generated through interaction between a highly reactive electron-deficient allylic carbocation and an electron-rich carbon-carbon double bond. The catalytic site consists of a large central cavity formed by mostly antiparallel alpha helices with two aspartate-rich regions (DDXX(XX)D) located on opposite walls. These residues mediate binding of prenyl phosphates via bridging Mg2+ ions, inducing proposed conformational changes that close the active site to solvent, protecting and stabilizing reactive carbocation intermediates. Farnesyl diphosphate synthases produce the precursors of steroids, cholesterol, sesquiterpenes, farnsylated proteins, heme, and vitamin K12; and geranylgeranyl diphosphate and longer chain synthases produce the precursors of carotenoids, retinoids, diterpenes, geranylgeranylated chlorophylls, ubiquinone, and archaeal ether linked lipids. Isoprenyl diphosphate synthases are widely distributed among archaea, bacteria, and eukareya.
Pssm-ID: 173833 Cd Length: 259 Bit Score: 319.50 E-value: 3.66e-107
Trans-Isoprenyl Diphosphate Synthases; Trans-Isoprenyl Diphosphate Synthases (Trans_IPPS) of ...
222-496
3.38e-73
Trans-Isoprenyl Diphosphate Synthases; Trans-Isoprenyl Diphosphate Synthases (Trans_IPPS) of class 1 isoprenoid biosynthesis enzymes which either synthesis geranyl/farnesyl diphosphates (GPP/FPP) or longer chained products from isoprene precursors, isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP), or use geranyl (C10)-, farnesyl (C15)-, or geranylgeranyl (C20)-diphosphate as substrate. These enzymes produce a myriad of precursors for such end products as steroids, cholesterol, sesquiterpenes, heme, carotenoids, retinoids, diterpenes, ubiquinone, and archaeal ether linked lipids; and are widely distributed among archaea, bacteria, and eukareya. The enzymes in this family share the same 'isoprenoid synthase fold' and include the head-to-tail (HT) IPPS which catalyze the successive 1'-4 condensation of the 5-carbon IPP to the growing isoprene chain to form linear, all-trans, C10-, C15-, C20- C25-, C30-, C35-, C40-, C45-, or C50-isoprenoid diphosphates. The head-to-head (HH) IPPS catalyze the successive 1'-1 condensation of 2 farnesyl or 2 geranylgeranyl isoprenoid diphosphates. Isoprenoid chain elongation reactions proceed via electrophilic alkylations in which a new carbon-carbon single bond is generated through interaction between a highly reactive electron-deficient allylic carbocation and an electron-rich carbon-carbon double bond. The catalytic site consists of a large central cavity formed by mostly antiparallel alpha helices with two aspartate-rich regions located on opposite walls. These residues mediate binding of prenyl phosphates via bridging Mg2+ ions, inducing proposed conformational changes that close the active site to solvent, stabilizing reactive carbocation intermediates. Mechanistically and structurally distinct, cis-IPPS are not included in this CD.
Pssm-ID: 173836 Cd Length: 236 Bit Score: 231.46 E-value: 3.38e-73
heptaprenyl diphosphate synthase component II; Members of this family are component II of the ...
188-497
7.72e-63
heptaprenyl diphosphate synthase component II; Members of this family are component II of the heterodimeric heptaprenyl diphosphate synthase. The trusted cutoff was set such that all members identified are encoded near to a recognizable gene for component I (in pfam07307). This enzyme acts in menaquinone-7 isoprenoid side chain biosynthesis. [Biosynthesis of cofactors, prosthetic groups, and carriers, Menaquinone and ubiquinone]
Pssm-ID: 131795 Cd Length: 319 Bit Score: 207.26 E-value: 7.72e-63
Isoprenoid Biosynthesis enzymes, Class 1; Superfamily of trans-isoprenyl diphosphate synthases ...
222-491
5.79e-53
Isoprenoid Biosynthesis enzymes, Class 1; Superfamily of trans-isoprenyl diphosphate synthases (IPPS) and class I terpene cyclases which either synthesis geranyl/farnesyl diphosphates (GPP/FPP) or longer chained products from isoprene precursors, isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP), or use geranyl (C10)-, farnesyl (C15)-, or geranylgeranyl (C20)-diphosphate as substrate. These enzymes produce a myriad of precursors for such end products as steroids, cholesterol, sesquiterpenes, heme, carotenoids, retinoids, and diterpenes; and are widely distributed among archaea, bacteria, and eukaryota.The enzymes in this superfamily share the same 'isoprenoid synthase fold' and include several subgroups. The head-to-tail (HT) IPPS catalyze the successive 1'-4 condensation of the 5-carbon IPP to the growing isoprene chain to form linear, all-trans, C10-, C15-, C20- C25-, C30-, C35-, C40-, C45-, or C50-isoprenoid diphosphates. Cyclic monoterpenes, diterpenes, and sesquiterpenes, are formed from their respective linear isoprenoid diphosphates by class I terpene cyclases. The head-to-head (HH) IPPS catalyze the successive 1'-1 condensation of 2 farnesyl or 2 geranylgeranyl isoprenoid diphosphates. Cyclization of these 30- and 40-carbon linear forms are catalyzed by class II cyclases. Both the isoprenoid chain elongation reactions and the class I terpene cyclization reactions proceed via electrophilic alkylations in which a new carbon-carbon single bond is generated through interaction between a highly reactive electron-deficient allylic carbocation and an electron-rich carbon-carbon double bond. The catalytic site consists of a large central cavity formed by mostly antiparallel alpha helices with two aspartate-rich regions located on opposite walls. These residues mediate binding of prenyl phosphates via bridging Mg2+ ions, inducing proposed conformational changes that close the active site to solvent, stabilizing reactive carbocation intermediates. Generally, the enzymes in this family exhibit an all-trans reaction pathway, an exception, is the cis-trans terpene cyclase, trichodiene synthase. Mechanistically and structurally distinct, class II terpene cyclases and cis-IPPS are not included in this CD.
Pssm-ID: 173830 [Multi-domain] Cd Length: 243 Bit Score: 179.23 E-value: 5.79e-53
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
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