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Enzyme Nomenclature
Information on EC 4.2.3.106 - (E)-beta-ocimene synthase
for references in articles please use BRENDA:EC4.2.3.106
Word Map on EC 4.2.3.106
- 4.2.3.106
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e-beta-ocimene
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volatile
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jasmonic
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terpene
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terpenoids
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herbivory
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blends
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defenses
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monoterpene
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emitted
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gaertn
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undamaged
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phaseolus
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insect-induced
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spodoptera
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medicago
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tetranychus
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acyclic
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legume
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enemies
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urticae
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infested
- lunatus
- truncatula
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spider
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z-3-hexenyl
- mites
- agriculture
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The enzyme appears in viruses and cellular organisms
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EC NUMBER 
COMMENTARY 
4.2.3.106
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RECOMMENDED NAME
GeneOntology No.
(E)-beta-ocimene synthase
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REACTION
REACTION DIAGRAM
COMMENTARY
ORGANISM
UNIPROT
LITERATURE
geranyl diphosphate = (E)-beta-ocimene + diphosphate
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-
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geranyl diphosphate = (E)-beta-ocimene + diphosphate
protein does not contain the RRx8W motif,suggesting that the reaction mechanism does not proceed via an RR-dependent isomerization of geranyl diphosphate to 3S-linalyl diphosphate
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PATHWAY
BRENDA Link
KEGG Link
MetaCyc Link
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SYSTEMATIC NAME
IUBMB Comments
geranyl-diphosphate diphosphate-lyase [(E)-beta-ocimene-forming]
Widely distributed in plants, which release beta-ocimene when attacked by herbivorous insects.
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ORGANISM
COMMENTARY
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
deduced protein does not contain the RRx8W motif; member of a subfamily of the terpene synthase family designated the Tps-g group, which lacks the RRx8W motif; memeber of TPSg group of terpene synthases
UniProt
; deduced protein contains a modification of the conserved RRx8W motif of plant monoterpene synthases. The N-terminal sequence indicates the presence of a plastid transit peptide
UniProt
member of TPSb group of angiosperm monoterpene and hemiterpene synthases
UniProt
member oft the TPSb subfamily of angiosperm monoterpene synthases; the tandem arginine motif RRX8W is conserved in the deduced protein of TPS10; bifunctional myrcene/(E)-beta-ocimene synthase
SwissProt
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GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
physiological function
enzyme is involved in the herbivore-induced indirect defense response of spider mite-infested Lotus japonicus via de novo formation and emission (E)-beta-ocimene
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SUBSTRATE
PRODUCT
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate)
(Substrate)
LITERATURE
(Substrate)
(Substrate)
COMMENTARY
(Product)
(Product)
LITERATURE
(Product)
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
r=reversible
ir=irreversible
?=not specified
(2E,6E)-farnesyl diphosphate
(E)-beta-ocimene + diphosphate
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-
-
?
geranyl diphosphate
(E)-beta-ocimene + diphosphate
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products are 97% (E)-beta-ocimene plus 2% (Z)-beta-ocimene and 1% myrcene
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?
geranyl diphosphate
(E)-beta-ocimene + diphosphate
product formation does not proceed via an RR-dependent isomerization of geranyl diphosphate to 3S-linalyl diphosphate
97% (E)-beta-ocimene plus minor amounts of (Z)-beta-ocimene and myrcene
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?
geranyl diphosphate
(E)-beta-ocimene + diphosphate
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products of Arabidopsis thaliana TPS10 are 56% beta-myrcene, 20% (E)-beta-ocimene, and less than 5% each of (+)-limonene, (-)-limonene, 2-carene, and tricyclene and an unknown monoterpene
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?
geranyl diphosphate
(E)-beta-ocimene + diphosphate
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94% (E)-beta-ocimene plus 4% (Z)-beta-ocimene and 2% myrcene
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?
geranyl diphosphate
(E)-beta-ocimene + diphosphate
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main products are 56% beta-myrcene and 20% (E)-beta-ocimene plus minor amounts of (-)-limonene, (+)-limnonene, 2-carene and tricyclene
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?
geranyl diphosphate
(E)-beta-ocimene + diphosphate
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97.2% (E)-beta-ocimene
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?
geranyl diphosphate
(E)-beta-ocimene + diphosphate
-
97.2% (E)-beta-ocimene
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?
geranyl diphosphate
(E)-beta-ocimene + diphosphate
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products are alpha-thujene and (+)-sabinene
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?
geranyl diphosphate
(E)-beta-ocimene + diphosphate
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products are 98% (E)-beta-ocimene plus 2% (Z)-beta-ocimene
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?
geranyl diphosphate
(E)-beta-ocimene + diphosphate
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98% (E)-beta-ocimene plus 2% (Z)-beta-ocimene
-
?
geranyl diphosphate
(E)-beta-ocimene + diphosphate
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products are 97.5% (E)-beta-ocimene plus 2% (Z)-beta-ocimene and 0.5% myrcene
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?
geranyl diphosphate
(E)-beta-ocimene + diphosphate
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97.5% of (E)-beta-ocimene plus 2% (Z)-beta-ocimene and 0.5% myrcene
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?
additional information
?
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enzyme shows both (E)-beta-ocimene and (E,E)-alpha-farnesene synthase activities
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additional information
?
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no substrate: farnesyl diphosphate and geranylgeranyl diphosphate
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additional information
?
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no substrate: farnesyl diphosphate and geranylgeranyl diphosphate
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-
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additional information
?
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no substrates: farnesyl diphosphate or geranylgeranyl diphosphate.
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-
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additional information
?
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no substrates: farnesyl diphosphate or geranylgeranyl diphosphate.
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additional information
?
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no substrate: farnesyl diphosphate
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METALS and IONS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
0.0026
(2E,6E)-farnesyl diphosphate
accession Columbia, 30°C, pH not specified in the publication
0.0067
geranyl diphosphate
accession Columbia, 30°C, pH not specified in the publication
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TURNOVER NUMBER [1/s]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
0.0048
(2E,6E)-farnesyl diphosphate
accession Columbia, 30°C, pH not specified in the publication
0.034
geranyl diphosphate
accession Columbia, 30°C, pH not specified in the publication
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pI VALUE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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SOURCE TISSUE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
SOURCE
additional information
(E)-b-ocimene is released from leaves of both undamaged and insect-damaged plants, but at levels two-fold higher in insect-damaged M.edicago truncatula
additional information
no constitutive expression in flowers, stems or roots
additional information
-
transcripts of MtEBOS are not detected via RNA blots in stems, flowers, and roots
additional information
transcripts of MtEBOS are not detected via RNA blots in stems, flowers, and roots
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LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY
GeneOntology No.
LITERATURE
SOURCE
N-terminal sequence indicates the presence of a plastid transit peptide
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MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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SUBUNITS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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POSTTRANSLATIONAL MODIFICATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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Cloned/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
expression in Escherichia coli
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EXPRESSION
ORGANISM
UNIPROT
LITERATURE
only slight variations in monoterpene synthase mRNA levels during the daily light/dark cycle
transcripts accumulate in leaves in response to exogenous jasmonic acid treatments, lepidopteran herbivory, and lepidopteran oral secretions
transcripts are upregulated in response to mechanical wounding and treatment with jasmonic acid, concurrent with induced emission of (E)-beta-ocimene
transcripts of LjEbOS are induced in plants infested with two-spotted spider mites, Tetranychus urticae, coinciding with increasing emissions of (E)-beta-ocimene as well as other volatiles, (Z)-3-hexenyl acetate and (E)-4,8-dimethyl-1,3,7-nonatriene, by the infested plants. Mechanical wounding of the leaves or application of alamethicin, a potent fungal elicitor of plant volatile emission, also induces transiently increased levels of transcripts, but not elevated release of (E)-beta-ocimene
treatment with the ethylene precursor, 1-aminocyclopropane-1-carboxylic acid does not cause an increase in transcripts
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APPLICATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
agriculture
when lima bean plants that have previously been placed downwind of transgenic tobacco plants that are constitutively overexpressing (E)-beta-ocimene synthase are infested by spider mites in an open-flow tunnel, they are more defensive to spider mites and more attractive to predatory mites, in comparison to the infested plants that have been placed downwind of wild-type tobacco plants. Similarly, when the transgenic tobacco-downwind maize plants are infested with Mythimna separata larvae, this results in reduced larval growth and greater attraction of parasitic wasps Cotesia kariyai. In a greenhouse experiment, lima bean plants placed near the transgenic tobacco plants are more attractive when damaged by spider mites, in comparison to the infested plants that have been placed near the wild-type plants. Volatile organic compounds emitted from infested receiver plants affect their conspecific neighboring plants to prime indirect defenses in response to herbivory
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LINKS TO OTHER DATABASES (specific for EC-Number 4.2.3.106)
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