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(3S)-2,3-epoxy-2,3-dihydrosqualene + H2O
dammarenediol II
(3S)-2,3-oxidosqualene + H2O
(20S)-dammarenediol
(S)-2,3-oxidosqualene + H2O
(20S)-dammarenediol
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S-isomer is the sole product, water addition to the dammarenyl cation intermediate is stereospecific
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(S)-2,3-oxidosqualene + H2O
(20S)-dammarenediol + hydroxydammarenone
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additional information
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(3S)-2,3-epoxy-2,3-dihydrosqualene + H2O
dammarenediol II
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(3S)-2,3-epoxy-2,3-dihydrosqualene + H2O
dammarenediol II
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(3S)-2,3-epoxy-2,3-dihydrosqualene + H2O
dammarenediol II
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(3S)-2,3-epoxy-2,3-dihydrosqualene + H2O
dammarenediol II
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r
(3S)-2,3-epoxy-2,3-dihydrosqualene + H2O
dammarenediol II
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r
(3S)-2,3-epoxy-2,3-dihydrosqualene + H2O
dammarenediol II
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r
(3S)-2,3-epoxy-2,3-dihydrosqualene + H2O
dammarenediol II
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r
(3S)-2,3-epoxy-2,3-dihydrosqualene + H2O
dammarenediol II
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GC-MS product analysis
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(3S)-2,3-epoxy-2,3-dihydrosqualene + H2O
dammarenediol II
dammarenediol-II is a ginsenoside precursor
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(3S)-2,3-epoxy-2,3-dihydrosqualene + H2O
dammarenediol II
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(3S)-2,3-oxidosqualene + H2O
(20S)-dammarenediol
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the accumulated product was confirmed as dammarenediol
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(3S)-2,3-oxidosqualene + H2O
(20S)-dammarenediol
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substrate is folded in a pre-chair-chair-chair conformation
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additional information
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LC-MS analysis of substrate and product amounts
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additional information
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LC-MS analysis of substrate and product amounts
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additional information
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dammarenediol-II synthase (DS) is a kind of 2,3-oxidosqualene-triterpene cyclase that catalyses 2,3-oxidosqualene to form dammarenediol-II. The substrate 2,3-oxidosqualene is cyclized by the enzyme at specific sites, and its particular 6-6-6-5 tetracyclic triterpenoid structure can be developed
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metabolism
the enzyme catalyzes the first step in biosynthetic pathway of ginsenosides, overview
metabolism
the enzyme catalyzes the first step in the biosynthetic pathway for ginsenosides in Panax ginseng, overview
metabolism
the enzyme catalyzes the first step in the synthesis of dammarane-type ginsenoside, the cyclization of 2,3-oxidosqualene to dammarenediol-II, overview
metabolism
the enzyme is involved in the ginsenoside biosynthetic pathway catalyzing the first committed step, the cyclization of 2,3-oxidosqualene to dammarenediol
physiological function
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Centella asiatica hairy roots overexpressing ginseng farnesyl diphosphate synthase show higher levels of dammarenediol synthase and cycloartenol synthase mRNA when compared with the controls. No differences are detected in expression of the squalene synthase gene. The upregulation of dammarenediol synthase transcripts suggests that FPS may result in alterations in triterpene biosynthesis capacity. Squalene contents in the T17, T24, and T27 lines increase to 1.1-, 1.3- and 1.5fold those in the controls, respectively. The total sterol contents in the T24 line are approximately three times higher than those of the controls
physiological function
dammarenediol-II synthase catalyzes the cyclization of 2,3-oxidosqualene to dammarenediol-II, which is the basic triterpene skeleton in dammarene-type saponin (ginsenosides) in Panax ginseng. Dammarenediol-II is present in the roots of Panax ginseng in trace amounts because it is an intermediate product in triterpene biosynthesis
physiological function
dammarenediol synthase is a key enzyme in the biosynthetic process of ginsenosides
physiological function
dammarenediol-II synthase gene (PgDDS) from Panax ginseng is responsible for the cyclization of 2,3-oxidosqualene to dammarenediol-II, the nucleus of dammarane-type ginsenosides, which are a group of active triterpenoids exhibiting various pharmacological activities
additional information
close correlation of dammarenediol synthetase and saponin production in vitro
additional information
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close correlation of dammarenediol synthetase and saponin production in vitro
additional information
determination of ginsenosides, i.e. Rg1, Re, F11, Rf, S-Rh1, Rg2, Rb1, R-Rh1, Rc, F1, R0, Rb2, Rb3, Rd, F2, S-Rg3, R1, and R-Rg3, in Panax ginseng cv. DAMAYA. The ginsenoside contents, of such as Rf, Rg1 and F1, change with the gene mutation
additional information
three-dimensional structure and catalytic active sites structures of dammarenediol-II synthase by homology modeling using human oxidosqualene cyclase 3D models (PDB IDs 1W6K and 1W6J) as templates and by molecular docking simulation between enzyme model and product dammarenediol-II, overview. Residues C568 and C264 play significant roles in the catalytic process of the enzyme. Active site residues are identified: Asp488 initiates the ring forming reaction by protonating the 2,3-oxirane ring, and is activated by strong polar amino acid Cys489 and Cys568. Aromatic residues Trp421, Phe477, Trp538, Tyr263 and Tyr732 may stabilize the intermediate conformation during the cyclization. Cys264, Tyr268 and Ile559 may have relation with a substrate channel that guides 2,3-oxidosqualene into the active site cavity
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C264A
site-directed mutagenesis, the mutant shows 53% decreased activity compared to the wild-type enzyme
C489A
site-directed mutagenesis, the mutant shows highly decreased activity compared to the wild-type enzyme
C568A
site-directed mutagenesis, the mutant shows slightly increased activity compared to the wild-type enzyme
D488A
site-directed mutagenesis, the mutant shows highly decreased activity compared to the wild-type enzyme
F477A
site-directed mutagenesis, the mutant shows highly decreased activity compared to the wild-type enzyme
I559A
site-directed mutagenesis, the mutant shows highly decreased activity compared to the wild-type enzyme
W421A
site-directed mutagenesis, the mutant shows highly decreased activity compared to the wild-type enzyme
W538A
site-directed mutagenesis, the mutant shows highly decreased activity compared to the wild-type enzyme
W616A
site-directed mutagenesis, the mutant shows highly decreased activity compared to the wild-type enzyme
Y263A
site-directed mutagenesis, the mutant shows highly decreased activity compared to the wild-type enzyme
Y268A
site-directed mutagenesis, the mutant shows highly decreased activity compared to the wild-type enzyme
Y732A
site-directed mutagenesis, the mutant shows highly decreased activity compared to the wild-type enzyme
additional information
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functionally expressed in the lanosterol synthase-deficient yeast mutant erg7
additional information
expression in Saccharomyces cerevisiae mutant lacking lanosterol synthase results in production of dammarenediol and hydroxydammarenone. Silencing of gene expression by RNAi leads to a reduction of ginsenoide production to 84.5% in roots
additional information
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expression in Saccharomyces cerevisiae mutant lacking lanosterol synthase results in production of dammarenediol and hydroxydammarenone. Silencing of gene expression by RNAi leads to a reduction of ginsenoide production to 84.5% in roots
additional information
establishment of dammarane-type ginsenosides synthesis from 2,3-oxidosqualene in Oryza sativa by expression of dammarenediol-II synthase from Panax ginseng resulting in a dammarane-type sapogenin 20(S)-protopanaxadiol (PPD) content of 0.35-0.59 mg/gdw and a dammarane-type sapogenin 20(S)-protopanaxatriol (PPT) content of 0.23-0.43 mg/g dry weight in the transgenic rice plants
additional information
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establishment of dammarane-type ginsenosides synthesis from 2,3-oxidosqualene in Oryza sativa by expression of dammarenediol-II synthase from Panax ginseng resulting in a dammarane-type sapogenin 20(S)-protopanaxadiol (PPD) content of 0.35-0.59 mg/gdw and a dammarane-type sapogenin 20(S)-protopanaxatriol (PPT) content of 0.23-0.43 mg/g dry weight in the transgenic rice plants
additional information
heterologous biosynthesis of triterpenoid dammarenediol-II, the precursor of dammarane-type tetracyclic ginsenosides, in engineered Escherichia coli strain BL21(DE3) by expressing the enzyme, and coexpressing squalene synthase, squalene epoxidase, and NADPH-cytochrome P450 reductase from Saccharomyces cerevisiae, and squalene epoxidase from Methylococcus capsulatus, as well as NADPH-cytochrome P450 reductase from Arabidopsis thaliana, and thereby reconstituting the 2,3-oxidosqualene-derived triterpenoid biosynthetic pathway. Method evaluation and optimization, overview
additional information
identification of single nucleotide polymorphisms in different samples of Panax ginseng cultivar DAMAYA, specific single nucleotide polymorphisms (SNPs) of the DDS gene might be associated with the accumulation of some ginsenosides in DAMAYA ginseng and thus can be used for varietal characterization, molecular identification, qualitative evaluation of ginseng-type medicinal materials, or gene engineering and ginseng breeding. The ginsenoside contents, of such as Rf, Rg1 and F1, change with the gene mutation
additional information
metabolic engineering of Pichia pastoris strain GS115 for the high yield production of dammarenediol-II, based on the native triterpene synthetic pathway, a dammarenediol-II synthetic pathway is established in Pichia pastoris by introducing a dammarenediol-II synthase gene (PgDDS) from Panax ginseng. To increase the supply of 2,3-oxidosqualene, the ERG1 gene, which is responsible for 2,3-oxidosqualene synthesis, is coexpressed. And to reduce competition for 2,3-oxidosqualene from ergosterol biosynthesis without affecting the normal growth of Pichia pastoris, the ERG7gene, which is responsible for conversion of 2,3-oxidosqualene to lanosterol, is downregulated by replacing its native promoter with a thiamine-repressible promoter, using a marker-recycling and gene-targeting Cre- lox71/66 system, developed for Pichia pastoris. Method evaluation and optimization, overview
additional information
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metabolic engineering of Pichia pastoris strain GS115 for the high yield production of dammarenediol-II, based on the native triterpene synthetic pathway, a dammarenediol-II synthetic pathway is established in Pichia pastoris by introducing a dammarenediol-II synthase gene (PgDDS) from Panax ginseng. To increase the supply of 2,3-oxidosqualene, the ERG1 gene, which is responsible for 2,3-oxidosqualene synthesis, is coexpressed. And to reduce competition for 2,3-oxidosqualene from ergosterol biosynthesis without affecting the normal growth of Pichia pastoris, the ERG7gene, which is responsible for conversion of 2,3-oxidosqualene to lanosterol, is downregulated by replacing its native promoter with a thiamine-repressible promoter, using a marker-recycling and gene-targeting Cre- lox71/66 system, developed for Pichia pastoris. Method evaluation and optimization, overview
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DNA and amino acid sequence determination and analysis, recombinant expression of functional His-tagged enzyme in Escherichia coli strains Origami B (DE3) amd Rosetta (DE3)
expression in an engineered strain of Saccharomyces cerevisiae strain 31147 from vector pAUR123, the enzyme is contained in microsomes, lipid particles, and total yeast homogenate
expression in Saccharomyces cerevisiae
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functional expression in Sacchaormyces cerevisiae
gene DDS, functional recombinant overexpression in Oryza sativa cv. Shuhui 527 plants using the Agrbacterium tumefaciens transfection method, transfer-DNA (T-DNA) insertion sites in homozygous lines of the T2 generation are determined by using high-efficiency thermal asymmetric interlaced PCR (hiTAIL-PCR), quantitative RT-PCR expression analysis
gene DDS, genotyping of cv. DAMAYA, identification of single nucleotide polymorphisms
gene DDS, recombinant expression in Pichia pastoris using the promoter of the AOX1 gene, coexpression with an ERG1 gene and an ERG7 gene
gene DDS, recombinant expression in Saccharomyces cerevisiae strain WTE (strain W303-1a integrated with pRS304-tHMG1 and pRS405-ERG20) from TEF1p-DS-ADH3t vector
gene PgDDS, functional expression in Nicotiana tabacum cv. Xanthi leaves using Agrobacterium strain GV3101, the heterologous expression confers resistance to Tobacco mosaic virus. Expression profile of PgDDS trangenic tobacco plants, overview. Production of dammarenediol-II in transgenic tobacco stimulates the expression of tobacco pathogenesis-related genes (PR1 and PR2) under both virus-untreated and -treated conditions
gene PNA, recombinant expression in Escherichia coli strain BL21(DE3), coexpression of squalene synthase (UniProt ID P29704), squalene epoxidase (UniProt ID P32476), and NADPH-cytochrome P450 reductase (UniProt ID P16603) from Saccharomyces cerevisiae, and squalene epoxidase (UniProt ID Q603D5) from Methylococcus capsulatus, as well as NADPH-cytochrome P450 reductase from Arabidopsis thaliana (UniProt ID Q9SB48)
gene PqDS, DNA and amino acid sequence determination and analysis, sequence comparisons and phylogenetic tree, ectopic heterologous co-expression with cytochrome P450 gene PqD12H in Saccharomyces cerevisiae
recombinant expression in Nicotiana tabacum cv. Xanthi leaves using transfection via Agrobacterium tumefaciens strain LBA4404, accumulation of dammarenediol-II in transgenic tobacco plants occurred in an organ-specific manner in descending order: roots, stems, leaves, flower buds, and transgenic cell suspension line 14 exhibits a high amount, overview
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Kushiro, T.; Ohno, Y.; Shibuya, M.; Ebizuka, Y.
In vitro conversion of 2,3-oxidosqualene into dammarenediol by Panax ginseng microsomes
Biol. Pharm. Bull.
20
292-294
1997
Panax ginseng
brenda
Tansakul, P.; Shibuya, M.; Kushiro, T.; Ebizuka, Y.
Dammarenediol-II synthase, the first dedicated enzyme for ginsenoside biosynthesis, in Panax ginseng
FEBS Lett.
580
5143-5149
2006
Panax ginseng (Q08IT1), Panax ginseng
brenda
Han, J.Y.; Kwon, Y.S.; Yang, D.C.; Jung, Y.R.; Choi, Y.E.
Expression and RNA interference-induced silencing of the dammarenediol synthase gene in Panax ginseng
Plant Cell Physiol.
47
1653-1662
2006
Panax ginseng (Q08IT1), Panax ginseng
brenda
Kim, O.T.; Kim, S.H.; Ohyama, K.; Muranaka, T.; Choi, Y.E.; Lee, H.Y.; Kim, M.Y.; Hwang, B.
Upregulation of phytosterol and triterpene biosynthesis in Centella asiatica hairy roots overexpressed ginseng farnesyl diphosphate synthase
Plant Cell Rep.
29
403-411
2010
Centella asiatica
brenda
Kim, O.T.; Lee, J.W.; Bang, K.H.; Kim, Y.C.; Hyun, D.Y.; Cha, S.W.; Choi, Y.E.; Jin, M.L.; Hwang, B.
Characterization of a dammarenediol synthase in Centella asiatica (L.) Urban
Plant Physiol. Biochem.
47
998-1002
2009
Centella asiatica
brenda
Hu, W.; Liu, N.; Tian, Y.; Zhang, L.
Molecular cloning, expression, purification, and functional characterization of dammarenediol synthase from Panax ginseng
BioMed Res. Int.
2013
285740
2013
Panax ginseng (Q08IT1), Panax ginseng
brenda
Wang, L.; Zhao, S.J.; Cao, H.J.; Sun, Y.
The isolation and characterization of dammarenediol synthase gene from Panax quinquefolius and its heterologous co-expression with cytochrome P450 gene PqD12H in yeast
Funct. Integr. Genomics
14
545-557
2014
Panax quinquefolius (M4WEZ8), Panax quinquefolius
brenda
Liang, Y.; Zhao, S.; Xu, L.; Zhang, X.
Heterologous expression of dammarenediol synthase gene in an engineered Saccharomyces cerevisiae
Lett. Appl. Microbiol.
55
323-329
2012
Panax ginseng (Q08IT1), Panax ginseng
brenda
Lee, M.H.; Han, J.Y.; Kim, H.J.; Kim, Y.S.; Huh, G.H.; Choi, Y.E.
Dammarenediol-II production confers TMV tolerance in transgenic tobacco expressing Panax ginseng dammarenediol-II synthase
Plant Cell Physiol.
53
173-182
2012
Panax ginseng (Q08IT1), Panax ginseng
brenda
Han, J.Y.; Wang, H.Y.; Choi, Y.E.
Production of dammarenediol-II triterpene in a cell suspension culture of transgenic tobacco
Plant Cell Rep.
33
225-233
2014
Panax ginseng (Q08IT1), Panax ginseng
brenda
Li, D.; Zhang, Q.; Zhou, Z.; Zhao, F.; Lu, W.
Heterologous biosynthesis of triterpenoid dammarenediol-II in engineered Escherichia coli
Biotechnol. Lett.
38
603-609
2016
Panax ginseng (Q08IT1)
brenda
Liu, T.; Zhang, X.; Zhao, F.; Lu, W.
Molecular simulation and catalytic active sites identification of dammarenediol-II synthase
J. Beijing Inst. Technol.
26
563-570
2017
Panax ginseng (Q08IT1)
-
brenda
Liu, X.B.; Liu, M.; Tao, X.Y.; Zhang, Z.X.; Wang, F.Q.; Wei, D.Z.
Metabolic engineering of Pichia pastoris for the production of dammarenediol-II
J. Biotechnol.
216
47-55
2015
Panax ginseng (Q08IT1), Panax ginseng
brenda
Cheng, C.; Wu, W.; Huang, B.; Liu, L.; Luo, P.; Zhou, H.
SNPs of dammarenediol synthase gene were associated with the accumulation of ginsenosides in DAMAYA ginseng, a cultivar of Panax ginseng C. A. Mey
Phytochem. Lett.
17
194-200
2016
Panax ginseng (Q08IT1)
-
brenda
Huang, Z.; Lin, J.; Cheng, Z.; Xu, M.; Huang, X.; Yang, Z.; Zheng, J.
Production of dammarane-type sapogenins in rice by expressing the dammarenediol-II synthase gene from Panax ginseng C.A. Mey
Plant Sci.
239
106-114
2015
no activity in Oryza sativa, Panax ginseng (Q08IT1), Panax ginseng
brenda