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Information on EC 1.14.13.128 - 7-methylxanthine demethylase
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1.14.13.128 7-methylxanthine demethylaseIUBMB Comments
A non-heme iron oxygenase. The enzyme from the bacterium Pseudomonas putida prefers NADH over NADPH. The enzyme is specific for 7-methylxanthine . Forms part of the caffeine degradation pathway.
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Word Map
- 1.14.13.128
- putida
-
demethylation
- theophylline
-
uric
- coffee
-
alkaloid
-
bioreactors
-
non-heme
-
oxygen-dependent
- klebsiella
-
bioprocess
- 3,7-dimethylxanthine
-
commences
- rhodococcus
-
broad-specificity
- aminopyrine
- alcaligenes
-
trimethyl
- 3-methylxanthine
- methylxanthines
- paraxanthine
-
rieske
- formaldehyde
-
costly
- 1,3,7-trimethylxanthine
- medicine
- pharmacology
The enzyme appears in viruses and cellular organisms
Synonyms
7-methylxanthine-specific N-demethylase, caffeine demethylase, heteroxanthine demethylase, methylxanthine N-demethylase, N-demethylase, ndmA, NdmC, theobromine demethylase, 
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SYNONYM 
ORGANISM
UNIPROT
COMMENTARY 
LITERATURE
7-methylxanthine-specific N-demethylase
methylxanthine N-demethylase
ndmA
NdmC
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REACTION
REACTION DIAGRAM
COMMENTARY
ORGANISM
UNIPROT
LITERATURE
7-methylxanthine + O2 + NAD(P)H + H+ = xanthine + NAD(P)+ + H2O + formaldehyde
-
-
-
-
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PATHWAY SOURCE
PATHWAYS
BRENDA
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SYSTEMATIC NAME
IUBMB Comments
7-methylxanthine:oxygen oxidoreductase (demethylating)
A non-heme iron oxygenase. The enzyme from the bacterium Pseudomonas putida prefers NADH over NADPH. The enzyme is specific for 7-methylxanthine [2]. Forms part of the caffeine degradation pathway.
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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
1,3,7-trimethylxanthine + O2 + NAD(P)H + H+
3,7-dimethylxanthine + formaldehyde + NAD(P)+
-
i.e. caffeine
i.e. theobromine
-
-
1,3,7-trimethylxanthine + O2 + NADPH + H+
1,3-dimethylxanthine + formaldehyde + NADP+ + H2O
-
i.e. caffeine
i.e. theophylline
-
-
1,3,7-trimethylxanthine + O2 + NADPH + H+
1,7-dimethylxanthine + formaldehyde + NADP+ + H2O
-
i.e. caffeine
i.e. paraxanthine
-
-
1,7-dimethylxanthine + O2 + NADPH + H+
7-methylxanthine + NADP+ + H2O + formaldehyde
-
i.e. paraxanthine, activity of the reductase component of the N-demethylase holoenzyme (Ccr) with NADPH is 22% of that with NADH. The enzyme also catalyzes the further demethylation of the product 7-methylxanthine to xanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
3,7-dimethylxanthine + O2 + NAD(P)H + H+
monomethylxanthine + formaldehyde + NADP+
-
theobromine demethylase
-
-
?
3-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
-
3-methylxanthine demethylation is 12% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
7-methylxanthine + O2 + NAD(P)H + H+
xanthine + formaldehyde + NADP+
-
heteroxanthine demethylase, substrate-selective
-
-
?
7-methylxanthine + O2 + NADPH + H+
xanthine + NADP+ + H2O + formaldehyde
-
-
-
-
?
caffeine + 2 O2 + 2 NADH + 2 H+
7-methylxanthine + 2 NAD+ + 2 H2O + 2 formaldehyde
-
i.e. 1,3,7-trimethylxanthine. Caffeine demethylation is 7% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
caffeine + 3 O2 + 3 NADH + 3 H+
xanthine + 3 NAD+ + 3 H2O + 3 formaldehyde
-
i.e. 1,3,7-trimethylxanthine. Caffeine demethylation is 7% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
caffeine + O2 + NADH + H+
1,7-dimethylxanthine + NAD+ + H2O + formaldehyde
-
i.e. 1,3,7-trimethylxanthine. Caffeine demethylation is 7% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
theobromine + 2 O2 + 2 NADH + 2 H+
xanthine + 2 NAD+ + 2 H2O + 2 formaldehyde
-
i.e. 3,7-dimethylxanthine. Theobromine demethylation is 13% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
theobromine + O2 + NADH + H+
3-methylxanthine + NAD+ + H2O + formaldehyde
-
i.e. 3,7-dimethylxanthine. Theobromine demethylation is 13% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
theobromine + O2 + NADH + H+
7-methylxanthine + NAD+ + H2O + formaldehyde
-
i.e. 3,7-dimethylxanthine. Theobromine demethylation is 13% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
theophylline + 2 O2 + 2 NADH + 2 H+
xanthine + 2 NAD+ + 2 H2O + 2 formaldehyde
-
1,3-dimethylxanthine. Theophylline demethylation is 3% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
theophylline + O2 + NADH + H+
1-methylxanthine + NAD+ + H2O + formaldehyde
-
1,3-dimethylxanthine. Theophylline demethylation is 3% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
1,7-dimethylxanthine + 2 O2 + 2 NADH + 2 H+
xanthine + 2 NAD+ + 2 H2O + 2 formaldehyde
-
i.e. paraxanthine, NADH is the preferred cofactor of reductase component of the N-demethylase holoenzyme (Ccr). The product 7-methylxanthine is further demethylated to xanthine. 1,7-Dimethylxanthine (paraxanthine) demethylation is 22% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
1,7-dimethylxanthine + 2 O2 + 2 NADH + 2 H+
xanthine + 2 NAD+ + 2 H2O + 2 formaldehyde
-
i.e. paraxanthine, NADH is the preferred cofactor of reductase component of the N-demethylase holoenzyme (Ccr). The product 7-methylxanthine is further demethylated to xanthine. 1,7-Dimethylxanthine (paraxanthine) demethylation is 22% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
1,7-dimethylxanthine + 2 O2 + 2 NADPH + 2 H+
xanthine + 2 NADP+ + 2 H2O + 2 formaldehyde
-
i.e. paraxanthine, activity of the reductase component of the N-demethylase holoenzyme (Ccr) with NADPH is 22% of that with NADH. The enzyme also catalyzes the further demethylation of the product 7-methylxanthine to xanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
1,7-dimethylxanthine + 2 O2 + 2 NADPH + 2 H+
xanthine + 2 NADP+ + 2 H2O + 2 formaldehyde
-
i.e. paraxanthine, activity of the reductase component of the N-demethylase holoenzyme (Ccr) with NADPH is 22% of that with NADH. The enzyme also catalyzes the further demethylation of the product 7-methylxanthine to xanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
1,7-dimethylxanthine + O2 + NADH + H+
7-methylxanthine + NAD+ + H2O + formaldehyde
-
i.e. paraxanthine, NADH is the preferred cofactor of reductase component of the N-demethylase holoenzyme (Ccr). The product 7-methylxanthine is further demethylated to xanthine. 1,7-Dimethylxanthine (paraxanthine) demethylation is 22% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
1,7-dimethylxanthine + O2 + NADH + H+
7-methylxanthine + NAD+ + H2O + formaldehyde
-
i.e. paraxanthine, NADH is the preferred cofactor of reductase component of the N-demethylase holoenzyme (Ccr). The product 7-methylxanthine is further demethylated to xanthine. 1,7-Dimethylxanthine (paraxanthine) demethylation is 22% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
7-methylxanthine + O2 + NAD(P)H + H+
xanthine + NAD(P)+ + H2O + formaldehyde
-
part of the caffeine degradation pathway in Pseudomonas putida
-
-
?
7-methylxanthine + O2 + NAD(P)H + H+
xanthine + NAD(P)+ + H2O + formaldehyde
-
part of the caffeine degradation pathway in Pseudomonas putida
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
-
-
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
-
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
specific substrate
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
-
the enzyme most actively demethylates 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
-
the N7-demethylation reaction absolutely requires a unique, tightly bound protein complex composed of NdmC, NdmD, and NdmE. NdmE functions as a noncatalytic subunit that serves a structural role in the complexation of the oxygenase (NdmC) and Rieske domains (NdmD)
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
-
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
specific substrate
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
-
the N7-demethylation reaction absolutely requires a unique, tightly bound protein complex composed of NdmC, NdmD, and NdmE. NdmE functions as a noncatalytic subunit that serves a structural role in the complexation of the oxygenase (NdmC) and Rieske domains (NdmD)
-
-
?
caffeine + O2 + NADH + H+
theobromine + NAD+ + H2O + formaldehyde
-
-
-
?
caffeine + O2 + NADH + H+
theobromine + NAD+ + H2O + formaldehyde
-
i.e. 1,3,7-trimethylxanthine. Caffeine demethylation is 7% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
caffeine + O2 + NADH + H+
theobromine + NAD+ + H2O + formaldehyde
-
-
-
?
theophylline + O2 + NADH + H+
3-methylxanthine + NAD+ + H2O + formaldehyde
-
-
-
?
theophylline + O2 + NADH + H+
3-methylxanthine + NAD+ + H2O + formaldehyde
-
1,3-dimethylxanthine. Theophylline demethylation is 3% of the activity compared to demethylation of 7-methylxanthine. Activity is absolutely dependent of oxygen as a cosubstrate
-
-
?
theophylline + O2 + NADH + H+
3-methylxanthine + NAD+ + H2O + formaldehyde
-
-
-
?
additional information
?
-
-
Ndm exhibits broad-based activity towards caffeine, theophylline, theobromine, 7-methylxanthine and 3-methylxanthine, all of which are growth substrates for Pseudomonas putida CBB5. Production of xanthine from all of these methylxanthines is confirmed. Ndm is most active on 7-methylxanthine, followed by 1,7-dimethylxanthine (paraxanthine), theobromine, 3-methylxanthine, caffeine and theophylline. Ndm does not catalyse O-demethylation of vanillate or vanillin, even after prolonged incubation
-
-
-
additional information
?
-
-
the metabolite is 1,3-dimethylxanthine, i.e. theophylline, is produced by the demethylation in the 7th position of the purine ring, mainly in fungi, overview
-
-
-
additional information
?
-
-
no activity of the heteroxanthine demethylase, when either caffeine or dimethylxanthines are used as substrates
-
-
-
additional information
?
-
caffeine, paraxanthine, and theobromine are not demethylated by the enzyme
-
-
-
additional information
?
-
-
no activity toward caffeine or theobromine
-
-
-
additional information
?
-
enzyme NdmA catalyzes NADH-dependent N1-demethylation of caffeine to theobromine and theophylline to 3-methylxanthine, and subsequently to 7-methylxanthine, and xanthine. Theobromine is the major product due to highly selective N1-demethylation caffeine by NdmA. But the minor production of paraxanthine from caffeine is due to slight promiscuity of the NdmA towards the N3-position on the caffeine molecule. Direct N-demethylation of caffeine at the N3 position does not occur appreciably with the three N-demethylases involved in caffeine degradation in CBB5
-
-
-
additional information
?
-
-
Ndm exhibits broad-based activity towards caffeine, theophylline, theobromine, 7-methylxanthine and 3-methylxanthine, all of which are growth substrates for Pseudomonas putida CBB5. Production of xanthine from all of these methylxanthines is confirmed. Ndm is most active on 7-methylxanthine, followed by 1,7-dimethylxanthine (paraxanthine), theobromine, 3-methylxanthine, caffeine and theophylline. Ndm does not catalyse O-demethylation of vanillate or vanillin, even after prolonged incubation
-
-
-
additional information
?
-
enzyme NdmA catalyzes NADH-dependent N1-demethylation of caffeine to theobromine and theophylline to 3-methylxanthine, and subsequently to 7-methylxanthine, and xanthine. Theobromine is the major product due to highly selective N1-demethylation caffeine by NdmA. But the minor production of paraxanthine from caffeine is due to slight promiscuity of the NdmA towards the N3-position on the caffeine molecule. Direct N-demethylation of caffeine at the N3 position does not occur appreciably with the three N-demethylases involved in caffeine degradation in CBB5
-
-
-
additional information
?
-
caffeine, paraxanthine, and theobromine are not demethylated by the enzyme
-
-
-
additional information
?
-
-
no activity toward caffeine or theobromine
-
-
-
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NATURAL SUBSTRATE
NATURAL 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
1,3,7-trimethylxanthine + O2 + NAD(P)H + H+
3,7-dimethylxanthine + formaldehyde + NAD(P)+
-
i.e. caffeine
i.e. theobromine
-
-
1,3,7-trimethylxanthine + O2 + NADPH + H+
1,3-dimethylxanthine + formaldehyde + NADP+ + H2O
-
i.e. caffeine
i.e. theophylline
-
-
1,3,7-trimethylxanthine + O2 + NADPH + H+
1,7-dimethylxanthine + formaldehyde + NADP+ + H2O
-
i.e. caffeine
i.e. paraxanthine
-
-
7-methylxanthine + O2 + NAD(P)H + H+
xanthine + NAD(P)+ + H2O + formaldehyde
-
part of the caffeine degradation pathway in Pseudomonas putida
-
-
?
7-methylxanthine + O2 + NAD(P)H + H+
xanthine + NAD(P)+ + H2O + formaldehyde
-
part of the caffeine degradation pathway in Pseudomonas putida
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
-
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
specific substrate
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
-
the N7-demethylation reaction absolutely requires a unique, tightly bound protein complex composed of NdmC, NdmD, and NdmE. NdmE functions as a noncatalytic subunit that serves a structural role in the complexation of the oxygenase (NdmC) and Rieske domains (NdmD)
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
-
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
specific substrate
-
-
?
7-methylxanthine + O2 + NADH + H+
xanthine + NAD+ + H2O + formaldehyde
-
the N7-demethylation reaction absolutely requires a unique, tightly bound protein complex composed of NdmC, NdmD, and NdmE. NdmE functions as a noncatalytic subunit that serves a structural role in the complexation of the oxygenase (NdmC) and Rieske domains (NdmD)
-
-
?
caffeine + O2 + NADH + H+
theobromine + NAD+ + H2O + formaldehyde
-
-
-
?
caffeine + O2 + NADH + H+
theobromine + NAD+ + H2O + formaldehyde
-
-
-
?
additional information
?
-
-
the metabolite is 1,3-dimethylxanthine, i.e. theophylline, is produced by the demethylation in the 7th position of the purine ring, mainly in fungi, overview
-
-
-
additional information
?
-
caffeine, paraxanthine, and theobromine are not demethylated by the enzyme
-
-
-
additional information
?
-
-
no activity toward caffeine or theobromine
-
-
-
additional information
?
-
enzyme NdmA catalyzes NADH-dependent N1-demethylation of caffeine to theobromine and theophylline to 3-methylxanthine, and subsequently to 7-methylxanthine, and xanthine. Theobromine is the major product due to highly selective N1-demethylation caffeine by NdmA. But the minor production of paraxanthine from caffeine is due to slight promiscuity of the NdmA towards the N3-position on the caffeine molecule. Direct N-demethylation of caffeine at the N3 position does not occur appreciably with the three N-demethylases involved in caffeine degradation in CBB5
-
-
-
additional information
?
-
enzyme NdmA catalyzes NADH-dependent N1-demethylation of caffeine to theobromine and theophylline to 3-methylxanthine, and subsequently to 7-methylxanthine, and xanthine. Theobromine is the major product due to highly selective N1-demethylation caffeine by NdmA. But the minor production of paraxanthine from caffeine is due to slight promiscuity of the NdmA towards the N3-position on the caffeine molecule. Direct N-demethylation of caffeine at the N3 position does not occur appreciably with the three N-demethylases involved in caffeine degradation in CBB5
-
-
-
additional information
?
-
caffeine, paraxanthine, and theobromine are not demethylated by the enzyme
-
-
-
additional information
?
-
-
no activity toward caffeine or theobromine
-
-
-
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COFACTOR
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
NADPH
-
activity of Ccr (reductase component of the N-demethylase holoenzyme) with NADPH is 22% of that with NADH
[2Fe-2S]-center
NdmA enzyme is a Rieske (2Fe-2S) non-heme iron monooxygenase that requires a partner reductase, NdmD, to transfer electrons from NADH
NADH
-
preferred cofactor of Ccr (reductase component of the N-demethylase holoenzyme)
NADH
NdmA enzyme is a Rieske (2Fe-2S) non-heme iron monooxygenase that requires a partner reductase, NdmD, to transfer electrons from NADH
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METALS and IONS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
Fe2+
Iron
Fe2+
-
preincubation of Ndm for 15 min with 1 mM Fe2+, followed by desalting, increases the iron content to 20.1 mol per mol hexameric N-demethylase component (Ndm) of the N-demethylase holoenzyme. After this treatment, Ndm specific activity increases about 6fold (when 50 mM Fe2+ is present in the enzyme reaction mixture). N-Demethylase component (Ndm) of the N-demethylase holoenzyme is deduced to be a Rieske [2Fe-2S]-domain containing non-haem iron oxygenase
Iron
-
a Rieske nonheme iron monooxygenase. The enzyme contains 2 mol of iron per mol of monomer
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INHIBITOR
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
Zn2+
-
theobromine demethylase enzyme is inhibited by Zn2+, which generates the accumulation of theobromine
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KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
0.0504
1,7-dimethylxanthine
-
pH 7.5, 30°C, kinetic parameters for two-subunit N-demethylase component (Ndm), in the presence of saturating amounts of Ccr (reductase component with cytochrome c reductase activity) and 50 mM Fe2+
1.1
3,7-Dimethylxanthine
-
theobromine demethylase, pH and temperature not specified in the publication
0.0153
7-methylxanthine
-
in 50 mM potassium phosphate buffer (pH 7.5) at 30°C
0.0638
7-methylxanthine
-
pH 7.5, 30°C, kinetic parameters for two-subunit N-demethylase component (Ndm), in the presence of saturating amounts of Ccr (reductase component with cytochrome c reductase activity) and 50 mM Fe2+
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TURNOVER NUMBER [1/s]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
0.27
1,7-dimethylxanthine
-
pH 7.5, 30°C, kinetic parameters for two-subunit N-demethylase component (Ndm), in the presence of saturating amounts of Ccr (reductase component with cytochrome c reductase activity) and 50 mM Fe2+
0.16
7-methylxanthine
-
in 50 mM potassium phosphate buffer (pH 7.5) at 30°C
1.58
7-methylxanthine
-
pH 7.5, 30°C, kinetic parameters for two-subunit N-demethylase component (Ndm), in the presence of saturating amounts of Ccr (reductase component with cytochrome c reductase activity) and 50 mM Fe2+
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kcat/KM VALUE [1/mMs-1]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
5.4
1,7-dimethylxanthine
-
pH 7.5, 30°C, kinetic parameters for two-subunit N-demethylase component (Ndm), in the presence of saturating amounts of Ccr (reductase component with cytochrome c reductase activity) and 50 mM Fe2+
10.17
7-methylxanthine
-
in 50 mM potassium phosphate buffer (pH 7.5) at 30°C
24.8
7-methylxanthine
-
pH 7.5, 30°C, kinetic parameters for two-subunit N-demethylase component (Ndm), in the presence of saturating amounts of Ccr (reductase component with cytochrome c reductase activity) and 50 mM Fe2+
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SPECIFIC ACTIVITY [µmol/min/mg]
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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pH OPTIMUM
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
7.3
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pH RANGE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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TEMPERATURE OPTIMUM
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
30
30 - 35
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ORGANISM
COMMENTARY
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
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GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
evolution
-
catabolism of caffeine in microorganisms commences via two possible mechanisms: demethylation and oxidation. Through the demethylation route, the major metabolite formed in fungi is theophylline, whereas theobromine is the major metabolite in bacteria
metabolism
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catabolism of caffeine in microorganisms commences via two possible mechanisms: demethylation and oxidation. Through the demethylation route, the major metabolite formed in fungi is theophylline, whereas theobromine is the major metabolite in bacteria. Catabolism of caffeine in microorganisms, overview
physiological function
physiological function
the enzyme NdmA catalyzes NADH-dependent N1-demethylation of caffeine to theobromine and theophylline to 3-methylxanthine, and subsequently to 7-methylxanthine, and xanthine. The oxidoreductase NdmD, UniProt ID H9N291, catalyzes the oxidation of NADH and transfers electrons to NdmA and NdmB, which catalyze the N-demethylation reaction
physiological function
-
the enzyme NdmA catalyzes NADH-dependent N1-demethylation of caffeine to theobromine and theophylline to 3-methylxanthine, and subsequently to 7-methylxanthine, and xanthine. The oxidoreductase NdmD, UniProt ID H9N291, catalyzes the oxidation of NADH and transfers electrons to NdmA and NdmB, which catalyze the N-demethylation reaction
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UNIPROT
ENTRY NAME
ORGANISM
NO. OF AA
NO. OF TRANSM. HELICES
MOLECULAR WEIGHT[Da]
SOURCE
Sequence
A0A418SL51_9RHOB
305
0
33803
TrEMBL
A0A1U9Z310_9RHIZ
277
0
31838
TrEMBL
A0A2Z2NZB2_9GAMM
288
0
32118
TrEMBL
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MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
240000
-
gel filtration, two-subunit N-demethylase component (Ndm) of the N-demethylase holoenzyme
41000
-
x * 41000, theobromine demethylase, SDS-PAGE, x * 36600-43500, caffeine demethylase complex, SDS-PAGE
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SUBUNIT
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
?
-
the soluble N-demethylase holoenzyme is composed of two components, a reductase component with cytochrome c reductase activity (Ccr) and a two-subunit N-demethylase component (Ndm), the native Ndm enzyme is probably composed of the two subunits (40000 Da (NdmA) and 35000 Da (NdmB)) in a hexameric configuration
?
-
x * 41000, theobromine demethylase, SDS-PAGE, x * 36600-43500, caffeine demethylase complex, SDS-PAGE
?
-
the soluble N-demethylase holoenzyme is composed of two components, a reductase component with cytochrome c reductase activity (Ccr) and a two-subunit N-demethylase component (Ndm), the native Ndm enzyme is probably composed of the two subunits (40000 Da (NdmA) and 35000 Da (NdmB)) in a hexameric configuration; x * 67000, SDS-PAGE
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PROTEIN VARIANTS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
additional information
additional information
production of theobromine and paraxanthine by engineered Escherichia coli expressing the enzyme NdmA and NdmN from Psseudomonas putida CBS5, method evaluation and optimization. Addition of metal ions is not required, additon of Co2+ and Zn2+ might inhibit the process
additional information
-
production of theobromine and paraxanthine by engineered Escherichia coli expressing the enzyme NdmA and NdmN from Psseudomonas putida CBS5, method evaluation and optimization. Addition of metal ions is not required, additon of Co2+ and Zn2+ might inhibit the process
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TEMPERATURE STABILITY
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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GENERAL STABILITY
ORGANISM
UNIPROT
LITERATURE
stabilization can be achieved by addition of either glycerol (20%), bovine serum albumin (10 mg/ml), dithiothreitol (1 mM) or the substrate 7-methylxanthine (1 mM). Storage under nitrogen atmosphere has a stabilizing influence. The addition of caffeine (1 mM), dimethylxanthines (1 mM) and protease inhibitors (pepstatin A, PMSF, 0.1 mM) is without influence on stability
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STORAGE STABILITY
ORGANISM
UNIPROT
LITERATURE
-80°C, two-subunit N-demethylase component (Ndm) of the N-demethylase holoenzyme is stable for over 1 month
-
4°C, 5 days, two-subunit N-demethylase component (Ndm) of the N-demethylase holoenzyme is stabel for at lewast 5 days
-
similar to caffeine demethylase, heteroxanthinedemethylase is also unstable and loss of activity occurs upon storage
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PURIFICATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
purification of two-subunit N-demethylase component (Ndm) of the N-demethylase holoenzyme
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CLONED (Commentary)
ORGANISM
UNIPROT
LITERATURE
gene ndmA, recombinant expression of ndmA and ndmD genes in Escherichia coli
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APPLICATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
medicine
-
methylxanthine intermediates of caffeine catabolism obtained by the action of N-demethylases have many applications. In medicine, theobromine and theophylline are used as diuretics, vasodilators, and myocardial stimulants. Monomethylxanthines can be converted to effective caffeine derivatives by chemical derivatization and hence can serve as interesting alternatives to caffeine. Xanthine also finds pharmaceutical application in drugs for treatment of asthma. The biotechnological potential of N-demethylases therefore lies not only in general decaffeination purposes but also in specific product recovery from caffeine
pharmacology
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methylxanthine intermediates of caffeine catabolism obtained by the action of N-demethylases have many applications. In medicine, theobromine and theophylline are used as diuretics, vasodilators, and myocardial stimulants. Monomethylxanthines can be converted to effective caffeine derivatives by chemical derivatization and hence can serve as interesting alternatives to caffeine. Xanthine also finds pharmaceutical application in drugs for treatment of asthma. The biotechnological potential of N-demethylases therefore lies not only in general decaffeination purposes but also in specific product recovery from caffeine
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REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Glück, M.; Lingens, F.
Heteroxanthinedemethylase, a new enzyme in the degradation of caffeine by Pseudomonas putida
Appl. Microbiol. Biotechnol.
28
59-62
1988
Pseudomonas putida
-
brenda
Summers, R.M.; Louie, T.M.; Yu, C.L.; Subramanian, M.
Characterization of a broad-specificity non-haem iron N-demethylase from Pseudomonas putida CBB5 capable of utilizing several purine alkaloids as sole carbon and nitrogen source
Microbiology
157
583-592
2011
Pseudomonas putida, Pseudomonas putida CBB5
brenda
Dash, S.S.; Gummadi, S.N.
Catabolic pathways and biotechnological applications of microbial caffeine degradation
Biotechnol. Lett.
28
1993-2002
2006
Pseudomonas putida
brenda
Summers, R.M.; Louie, T.M.; Yu, C.L.; Gakhar, L.; Louie, K.C.; Subramanian, M.
Novel, highly specific N-demethylases enable bacteria to live on caffeine and related purine alkaloids
J. Bacteriol.
194
2041-2049
2012
Pseudomonas putida (M1EY73), Pseudomonas putida CBB5 (M1EY73), Pseudomonas putida CBB5
brenda
Summers, R.M.; Seffernick, J.L.; Quandt, E.M.; Yu, C.L.; Barrick, J.E.; Subramanian, M.V.
Caffeine junkie: an unprecedented glutathione S-transferase-dependent oxygenase required for caffeine degradation by Pseudomonas putida CBB5
J. Bacteriol.
195
3933-3939
2013
Pseudomonas putida (M1EY73), Pseudomonas putida CBB5 (M1EY73)
brenda
Algharrawi, K.; Summers, R.; Subramanian, M.
Production of theobromine by N-demethylation of caffeine using metabolically engineered E. coli
Biocatal. Agricult. Biotechnol.
11
153-160
2017
Pseudomonas putida (H9N289), Pseudomonas putida CBB5 (H9N289)
-
brenda
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