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Enzyme Nomenclature
Information on EC 1.14.13.121 - premnaspirodiene oxygenase
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The expected taxonomic range for this enzyme is: Hyoscyamus muticus
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EC NUMBER 
COMMENTARY 
1.14.13.121
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RECOMMENDED NAME
GeneOntology No.
premnaspirodiene oxygenase
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REACTION
REACTION DIAGRAM
COMMENTARY
ORGANISM
UNIPROT
LITERATURE
(-)-vetispiradiene + NADPH + H+ + O2 = solavetivol + NADP+ + H2O
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-
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solavetivol + NADPH + H+ + O2 = solavetivone + NADP+ + 2 H2O
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-
-
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REACTION TYPE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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PATHWAY
BRENDA Link
KEGG Link
MetaCyc Link
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SYSTEMATIC NAME
IUBMB Comments
(-)-vetispiradiene,NADPH:oxygen 2alpha-oxidoreductase
A heme-thiolate protein (P-450). The enzyme from the plant Hyoscymus muticus also hydroxylates valencene at C-2 to give the alpha-hydroxy compound, nootkatol, and this is converted into nootkatone. 5-Epiaristolochene and epieremophilene are hydroxylated at C-2 to give a 2beta-hydroxy derivative which is not further oxidized.
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ORGANISM
COMMENTARY
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
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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
(-)-vetispiradiene + NADPH + H+ + O2
solavetivol + NADP+ + H2O
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solavetivol is also named premnaspirodien-2alpha-ol or (2S,4R,5S,7R)-spirovetiva-1(10),11(12)-dien-2-ol
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?
5-epiaristolochene + NADPH + H+ + O2
2beta-hydroxy-epiaristolochene + 1beta-hydroxy-epiaristolochene + 3alpha-hydroxy-epiaristolochene + ? + NADP+ + H2O
substrate affinity for 5-epiaristolochene is 2-4times lower than that for valencene or (-)-premnaspirodiene, respectively. HPO catalyzes the conversion of 5-epiaristolochene to four mono-hydroxylated products with 2beta-hydroxy-epiaristolochene comprising greater than 80% of the reaction products, 1beta-hydroxy-epiaristolochene about 5%, 3alpha-hydroxy-epiaristolochene less than 2%, and an unknown mono-hydroxylated product of about 20%
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?
epiaristolochen-2beta-ol + NADPH + H+ + O2
2beta-hydroxy-epiaristolochene + NADP+ + H2O
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-
-
?
epieremophilen-2beta-ol + NADPH + H+ + O2
2beta-hydroxy-epieremophilene + NADP+ + H2O
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-
-
?
valencene + NADPH + H+ + O2
alpha-nootkatol + beta-nootkatol + NADP+ + H2O
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-
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?
additional information
?
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HPO also catalyzes the equivalent regio-specific (C-2) hydroxylation of several eremophilane-type (decalin ring system) sesquiterpenes, such as with 5-epi-aristolochene
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additional information
?
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the enzyme fails to convert nootkatol to nootkatone
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-
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NATURAL SUBSTRATES
NATURAL PRODUCTS
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
additional information
?
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A6YIH8
HPO also catalyzes the equivalent regio-specific (C-2) hydroxylation of several eremophilane-type (decalin ring system) sesquiterpenes, such as with 5-epi-aristolochene
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KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
0.0062
(-)-vetispiradiene
mutant enzyme V482I, in 100 mM Tris-HCl, pH 7.5, at 30°C
0.0084
(-)-vetispiradiene
mutant enzyme V480I/A484I, in 100 mM Tris-HCl, pH 7.5, at 30°C
0.013
(-)-vetispiradiene
mutant enzyme V482I/A484I, in 100 mM Tris-HCl, pH 7.5, at 30°C
0.014
(-)-vetispiradiene
wild type enzyme, in 100 mM Tris-HCl, pH 7.5, at 30°C
0.0025
5-epiaristolochene
mutant enzyme V480I/A484I, product is 2beta-hydroxy-epiaristolochene, in 100 mM Tris-HCl, pH 7.5, at 30°C
0.0033
5-epiaristolochene
wild type enzyme, product is 2beta-hydroxy-epiaristolochene, in 100 mM Tris-HCl, pH 7.5, at 30°C
0.0043
5-epiaristolochene
mutant enzyme V482I/A484I, product is 2beta-hydroxy-epiaristolochene, in 100 mM Tris-HCl, pH 7.5, at 30°C
0.0179
5-epiaristolochene
mutant enzyme V482I, product is 2beta-hydroxy-epiaristolochene, in 100 mM Tris-HCl, pH 7.5, at 30°C
0.0069
valencene
mutant enzyme V482I, product is beta-nootkatol, in 100 mM Tris-HCl, pH 7.5, at 30°C
0.0074
valencene
wild type enzyme, product is beta-nootkatol, in 100 mM Tris-HCl, pH 7.5, at 30°C
0.0121
valencene
mutant enzyme V482I/A484I, product is beta-nootkatol, in 100 mM Tris-HCl, pH 7.5, at 30°C
0.0192
valencene
mutant enzyme V480I/A484I, product is beta-nootkatol, in 100 mM Tris-HCl, pH 7.5, at 30°C
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TURNOVER NUMBER [1/s]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
2.1
(-)-vetispiradiene
wild type enzyme, in 100 mM Tris-HCl, pH 7.5, at 30°C
3.8
(-)-vetispiradiene
mutant enzyme V482I, in 100 mM Tris-HCl, pH 7.5, at 30°C
12.7
(-)-vetispiradiene
mutant enzyme V480I/A484I, in 100 mM Tris-HCl, pH 7.5, at 30°C
20.7
(-)-vetispiradiene
mutant enzyme V482I/A484I, in 100 mM Tris-HCl, pH 7.5, at 30°C
0.2
5-epiaristolochene
wild type enzyme, product is 2beta-hydroxy-epiaristolochene, in 100 mM Tris-HCl, pH 7.5, at 30°C
0.7
5-epiaristolochene
mutant enzyme V480I/A484I, product is 2beta-hydroxy-epiaristolochene, in 100 mM Tris-HCl, pH 7.5, at 30°C
1.4
5-epiaristolochene
mutant enzyme V482I, product is 2beta-hydroxy-epiaristolochene, in 100 mM Tris-HCl, pH 7.5, at 30°C
2.8
5-epiaristolochene
mutant enzyme V482I/A484I, product is 2beta-hydroxy-epiaristolochene, in 100 mM Tris-HCl, pH 7.5, at 30°C
1.9
valencene
wild type enzyme, product is beta-nootkatol, in 100 mM Tris-HCl, pH 7.5, at 30°C
5.1
valencene
mutant enzyme V482I, product is beta-nootkatol, in 100 mM Tris-HCl, pH 7.5, at 30°C
5.7
valencene
mutant enzyme V480I/A484I, product is beta-nootkatol, in 100 mM Tris-HCl, pH 7.5, at 30°C
15.9
valencene
mutant enzyme V482I/A484I, product is beta-nootkatol, in 100 mM Tris-HCl, pH 7.5, at 30°C
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kcat/KM VALUE [1/mMs-1]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
150
(-)-vetispiradiene
wild type enzyme, in 100 mM Tris-HCl, pH 7.5, at 30°C
610
(-)-vetispiradiene
mutant enzyme V482I, in 100 mM Tris-HCl, pH 7.5, at 30°C
1510
(-)-vetispiradiene
mutant enzyme V480I/A484I, in 100 mM Tris-HCl, pH 7.5, at 30°C
1590
(-)-vetispiradiene
mutant enzyme V482I/A484I, in 100 mM Tris-HCl, pH 7.5, at 30°C
60
5-epiaristolochene
wild type enzyme, product is 2beta-hydroxy-epiaristolochene, in 100 mM Tris-HCl, pH 7.5, at 30°C
80
5-epiaristolochene
mutant enzyme V482I, product is 2beta-hydroxy-epiaristolochene, in 100 mM Tris-HCl, pH 7.5, at 30°C
280
5-epiaristolochene
mutant enzyme V480I/A484I, product is 2beta-hydroxy-epiaristolochene, in 100 mM Tris-HCl, pH 7.5, at 30°C
650
5-epiaristolochene
mutant enzyme V482I/A484I, product is 2beta-hydroxy-epiaristolochene, in 100 mM Tris-HCl, pH 7.5, at 30°C
260
valencene
wild type enzyme, product is beta-nootkatol, in 100 mM Tris-HCl, pH 7.5, at 30°C
300
valencene
mutant enzyme V480I/A484I, product is beta-nootkatol, in 100 mM Tris-HCl, pH 7.5, at 30°C
740
valencene
mutant enzyme V482I, product is beta-nootkatol, in 100 mM Tris-HCl, pH 7.5, at 30°C
1310
valencene
mutant enzyme V482I/A484I, product is beta-nootkatol, in 100 mM Tris-HCl, pH 7.5, at 30°C
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LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY
GeneOntology No.
LITERATURE
SOURCE
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Cloned/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
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ENGINEERING
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
V480S
the mutation improves the kcat for the conversion of (-)-vetispiradiene to solavetivol about 2fold
V482I
mutant with improved catalytic efficiency; the mutation improves the kcat for the conversion of (-)-vetispiradiene to solavetivol about 2fold
V482I/A484I
the mutant possesses a 5fold improvement in its catalytic efficiency for nootkatol biosynthesis and a 10fold improvement for 2beta-hydroxy-epiaristolochene biosynthesis
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LINKS TO OTHER DATABASES (specific for EC-Number 1.14.13.121)
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