1.6.2.2: cytochrome-b5 reductase
This is an abbreviated version!
For detailed information about cytochrome-b5 reductase, go to the full flat file.
Word Map on EC 1.6.2.2
-
1.6.2.2
-
erythrocyte
-
methemoglobinemia
-
nadph-cytochrome
-
hereditary
-
reductases
-
cyanosis
-
fad
-
ferricyanide
-
flavoproteins
-
desaturation
-
dt-diaphorase
-
aniline
-
amidoxime
-
methb
-
hemolysate
-
bioreductive
-
n-demethylase
-
aminopyrine
-
marc
-
n-hydroxylated
-
mixed-function
-
nadh-binding
-
methaemoglobin
-
medicine
-
oxyhemoglobin
-
diagnostics
-
analysis
-
industry
-
drug development
- 1.6.2.2
- erythrocyte
- methemoglobinemia
-
nadph-cytochrome
- hereditary
- reductases
-
cyanosis
- fad
- ferricyanide
- flavoproteins
-
desaturation
- dt-diaphorase
- aniline
-
amidoxime
-
methb
-
hemolysate
-
bioreductive
- n-demethylase
- aminopyrine
-
marc
-
n-hydroxylated
-
mixed-function
-
nadh-binding
- methaemoglobin
- medicine
-
oxyhemoglobin
- diagnostics
- analysis
- industry
- drug development
Reaction
Synonyms
b5 plusb5R, b5/b5R, B5R, cb5r, CBR, CBR1, CBR1A, CBR1B, CyB5R, CYB5R2, CYB5R3, Cyb5R4, cyt b5r, cyt b5R protein, cytochrome b5 reductase, cytochrome b5 reductase 2, cytochrome b5 reductase 3, DIA1, diaphorase I, dihydronicotinamide adenine dinucleotide-cytochrome b5 reductase, HPO-19, methemoglobin reductase, NADH cytochrome b5 oxidoreductase, NADH cytochrome B5 reductase, NADH-b5R, NADH-cytochrome b 5 reductase, NADH-cytochrome b5 reductase, NADH-cytochrome b5 reductase 3, NADH-cytochrome-b5 reductase, NADH-cytochrome-b5 reductase 3, NADH-dependent cytochrome b5 reductase, NADH-ferricyanide reductase, NADH-ferricytochrome b5 oxidoreductase, NADH-ferricytochrome reductase, NADH: ferricytochrome b5 oxidoreductase, NADH:cytochrome b5 reductase, NADH:ferricytochrome b5 oxidoreductase, Ncb5or, P34/P32, P35, reduced nicotinamide adeninedinucleotide-cytochrome b5 reductase, reductase, cytochrome b5, T05H4.4
ECTree
1.6.2.2 cytochrome-b5 reductaseAdvanced search results
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results (Substrates Products
Substrates Products on EC 1.6.2.2 - cytochrome-b5 reductase
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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
1,2-dihydro-8-(4-methylpiperazin-1-yl)-4-phenylimidazol[3,2-e]pyrazine 5-oxide + NADH
1,2-dihydro-8-(4-methylpiperazin-1-yl)-4-phenylimidazol[3,2-e]pyrazine + NAD+
-
potential bioreductive drug, trivial name RB90740
-
?
2 ferricytochrome b5 + NADPH
2 ferrocytochrome b5 + NADP+ + H+
with NADPH the enzyme shows about 20% of the activity with NADH
-
-
?
2-[4-iodophenyl]-3-[4-nitrophenyl]-5-[2,4-disulfophenyl]-2H tetrazolium monosodium salt + NADH
?
-
-
-
?
aquacobalamin + NADH
reduced aquacobalamin + NAD+
-
in the presence of outer membrane cytochrome b, no activity with cyanocobalamin
-
?
Fe3+-ammonium sulfate + NADH
Fe2+-ammonium sulfate + NAD+
-
strongly elevated by the addition of cytochrome b5
-
?
Fe3+-histidine + NADH
Fe2+-histidine + NAD+
-
strongly elevated by the addition of cytochrome b5
-
?
Fe3+-nitrilotriacetate + NADH
Fe2+-nitrilotriacetate + NAD+
-
in the presence of cytochrome b5, iron chelate reduction in descending order: Fe3+-nitrolotriacetate, Fe3+-ADP, Fe3+-diphosphate, Fe3+-citrate
-
?
ferricytochrome b5 + 4-(5-(4-[amino(hydroxyamino)methyl]phenyl)-2-furyl)-N'-hydroxybenzenecarboximidamide
ferrocytochrome b5 + ?
-
metabolite of DB289, an antimicrobial prodrug of furamidine
-
-
?
ferricytochrome b5 + 4-(5-(4-[amino(hydroxyamino)methyl]phenyl)-2-furyl)-N'-methoxybenzenecarboximidamide
ferrocytochrome b5 + ?
-
metabolite of DB289, an antimicrobial prodrug of furamidine
-
-
?
ferricytochrome b5 + N-hydroxy-2-amino-1-methyl-6-phenylimidazol[4,5-b]pyridine
ferrocytochrome b5 + ?
-
arylhydroxylamine carcinogen found in grilled meat
-
-
?
ferricytochrome b5 + N-hydroxy-4-aminobiphenyl
ferrocytochrome b5 + ?
-
arylhydroxylamine carcinogen found in cigarette smoke
-
-
?
methemoglobin-ferrocyanide complex + NADH
reduced methemoglobin-ferrocyanide complex + NAD+
-
-
-
?
NADH + ferricytochrome b5 + oxidized soluble guanylate cyclase
NAD+ + H+ + ferrocytochrome b5 + reduced soluble guanylate cyclase
-
-
-
-
?
NADH + oxidized 2,6-dichlorophenolindophenol
NAD+ + H+ + reduced 2,6-dichlorophenolindophenol
NADH + oxidized nitroblue tetrazolium
NAD+ + H+ + reduced nitroblue tetrazolium
-
-
-
-
?
sulfamethoxazole hydroxylamine + NADH
?
-
in the presence of cytochrome b5
-
-
?
2 ferricyanide + NADH
2 ferrocyanide + NAD+ + H+
-
-
-
-
?
2 ferricyanide + NADH
2 ferrocyanide + NAD+ + H+
-
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
-
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
specific for NADH as electron donor, artificial acceptors: ferricyanide, 2,6-dichlorphenolindophenol
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
no acceptors: ubiquinone-30, menadione, dihydrofolate, lipoamide
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
poor donor: NADPH
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
artificial acceptor: ferricyanide, high reactivity with NADPH as electron donor
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
-
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
-
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
specific for NADH as electron donor, artificial acceptors: ferricyanide, 2,6-dichlorphenolindophenol
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
specific for NADH as electron donor, artificial acceptors: ferricyanide, 2,6-dichlorphenolindophenol
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
specific for NADH as electron donor, artificial acceptors: ferricyanide, 2,6-dichlorphenolindophenol
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
specific for NADH as electron donor, artificial acceptors: ferricyanide, 2,6-dichlorphenolindophenol
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
poor electron acceptors: methylene blue, ferricytochrome c, O2, oxidized glutathione, methemoglobin
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
artificial electron acceptor in the presence of menadione: cytochrome c
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
additional electron donors: deamino-NADH, 3-acetylpyridine-NADH
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
artificial acceptors: p-benzoquinone, 5-hydroxy-1,4-naphthoquinone, nitroblue-tetrazolium
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
additional acceptor: methemoglobin-ferrocyanide complex
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
involved in metabolism of endogenous compounds such as steroids, drugs, carcinogens, environmental pollutants
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
enzyme participates in methemoglobin reduction in erythrocytes, in other tissues it plays a role in elongation and desaturation of fatty acids, P-450 mediated drug metabolism and cholesterol biosynthesis as part of the microsomal electron transfer system
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
soluble form of erythrocytes: reduction of methemoglobin
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
soluble form of erythrocytes: reduction of methemoglobin
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
involved in the synthesis of fatty acids and cholesterol, and in the oxidation of xenobiotics
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
involved in the synthesis of fatty acids and cholesterol, and in the oxidation of xenobiotics
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
involved in the synthesis of fatty acids and cholesterol, and in the oxidation of xenobiotics, enzyme in presence of cytochrome b5 supports activity of CYP2E1
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
involved in the synthesis of fatty acids and cholesterol, and in the oxidation of xenobiotics, participates in the regeneration of vitamin E and of ascorbate, maintains antioxidant levels and is therefore involved in the protection of membrane lipids from peroxidation, considered as a constitutive housekeeping enzyme
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
recessive congenital methaemoglobinaemia, is caused by NADH-cytochrome b5 reductase deficiency. Two distinct clinical forms, types I and II, are recognized, both characterized by cyanosis from birth. In type II, the cyanosis is accompanied by neurological impairment and reduced life expectancy
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
the electrostatic interactions between the lysyl residues (K42, K126, K163, and K164) in the enzyme and the carboxyl groups (E47, E48, E52, E60, and D64) of cytochrome b5 keep the proteins tightly complexed and are suitable for electron transfer, reaction mechanism, overview
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
potassium ferricyanide, cytochrome b5, or NADH-2,6-dichlorophenol-indophenol can act as electron acceptors
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
involved in the synthesis of fatty acids and cholesterol, and in the oxidation of xenobiotics, removal of reactive oxygen species
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
uses both NADH and NADPH as electron donors, artificial acceptors: ferricyanide, 2,6-dichlophenolindophenol
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
-
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
low activity with trypsin-solubilized cytochrome b5
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
specific for NADH as electron donor, artificial acceptors: ferricyanide, 2,6-dichlorphenolindophenol
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
specific for NADH as electron donor, artificial acceptors: ferricyanide, 2,6-dichlorphenolindophenol
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
specific for NADH as electron donor, artificial acceptors: ferricyanide, 2,6-dichlorphenolindophenol
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
specific for NADH as electron donor, artificial acceptors: ferricyanide, 2,6-dichlorphenolindophenol
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
additional acceptor: hemin
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
poor donor: NADPH
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
additional acceptor: methemoglobin-ferrocyanide complex
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
artificial acceptor: ferricyanide
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
additional acceptor: methemerythrin
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
-
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
specific for NADH as electron donor, artificial acceptors: ferricyanide, 2,6-dichlorphenolindophenol
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
recombinant enzyme, very low activity with NADPH
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
involved in desaturation of fatty acids
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
involved in the synthesis of fatty acids and cholesterol, and in the oxidation of xenobiotics
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
involved in the synthesis of fatty acids and cholesterol, and in the oxidation of xenobiotics, enzyme defects causes methemoglobinemia type I or type II
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
involved in the synthesis of fatty acids and cholesterol, and in the oxidation of xenobiotics, mutations can cause methemoglobinemia type I or II
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
involved in the synthesis of fatty acids and cholesterol, and in the oxidation of xenobiotics, removal of reactive oxygen species
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
specific for NADH as electron donor, artificial acceptors: ferricyanide, 2,6-dichlorphenolindophenol
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
enzyme complex drives the entire sterol 14-demethylation reaction
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
involved in desaturation of fatty acids
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
involved in the synthesis of fatty acids and cholesterol, and in the oxidation of xenobiotics
-
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
-
membrane bound form of somatic cells: essential for lipid metabolism
-
?
2 ferricytochrome b5 + NADH
2 ferrocytochrome b5 + NAD+ + H+
enzyme is assumed to be part of an endoplasmic reticulum associated redox chain that oxidizes NADH to provide electrons via cytochrome b5 to endoplasmic reticulum associated fatty acyl desaturase and related hydroxylases as in mammals
-
?
2 ferricytochrome c + NADH
2 ferrocytochrome c + NAD+ + H+
-
increases in the presence of cytochrome b5
-
-
?
2 ferricytochrome c + NADH
2 ferrocytochrome c + NAD+ + H+
-
in the presence of outer membrane cytochrome b
-
?
2 ferricytochrome c + NADH
2 ferrocytochrome c + NAD+ + H+
-
cytochrome b5/cytochrome b5 reductase FAD-domain-fusion protein, NADPH is preferred
-
?
2 ferricytochrome c + NADH
2 ferrocytochrome c + NAD+ + H+
reduces also ferricyanide
-
?
2 ferricytochrome c + NADH
2 ferrocytochrome c + NAD+ + H+
isoforms I and II, 16% and 27% of Fe3+-citrate reduction respectively
-
?
2 ferricytochrome c + NADH
2 ferrocytochrome c + NAD+ + H+
isoforms I and II, 16% and 27% of Fe3+-citrate reduction respectively
-
?
Cu2+-citrate + NADH
Cu+-citrate + NAD+
isoforms I and II, 59 and 47% of Fe3+-citrate reduction respectively
-
?
Cu2+-citrate + NADH
Cu+-citrate + NAD+
isoforms I and II, 59 and 47% of Fe3+-citrate reduction respectively
-
?
Fe3+-ATP + NADH
Fe2+-ATP + NAD+
-
reconstituted system containing NADH, cytochrome b5 reductase, cytochrome b5 and microsomal lipids catalyzes lipid peroxidation in the presence of ferric-ATP, ferric-histidine and ferric-ammonium sulfate
-
?
NADH + ferricytochrome b5
NAD+ + H+ + ferrocytochrome b5
-
-
-
?
NADH + ferricytochrome b5
NAD+ + H+ + ferrocytochrome b5
-
-
-
-
?
NADH + ferricytochrome b5
NAD+ + H+ + ferrocytochrome b5
-
-
-
-
r
NADH + ferricytochrome b5
NAD+ + H+ + ferrocytochrome b5
-
-
-
?
NADH + ferricytochrome b5
NAD+ + H+ + ferrocytochrome b5
-
-
-
-
?
NADH + ferricytochrome b5
NAD+ + H+ + ferrocytochrome b5
-
-
-
-
r
NADH + ferricytochrome b5
NAD+ + H+ + ferrocytochrome b5
-
-
-
-
?
NADH + ferricytochrome b5
NAD+ + H+ + ferrocytochrome b5
-
-
-
-
?
NADH + ferricytochrome b5
NAD+ + H+ + ferrocytochrome b5
-
-
-
r
NADH + ferricytochrome b5
NAD+ + H+ + ferrocytochrome b5
-
-
-
-
r
NADH + ferricytochrome b5
NAD+ + H+ + ferrocytochrome b5
-
-
-
?
NADH + oxidized 2,6-dichlorophenolindophenol
NAD+ + H+ + reduced 2,6-dichlorophenolindophenol
-
-
-
?
NADH + oxidized 2,6-dichlorophenolindophenol
NAD+ + H+ + reduced 2,6-dichlorophenolindophenol
-
-
-
?
NADH + oxidized 2,6-dichlorophenolindophenol
NAD+ + H+ + reduced 2,6-dichlorophenolindophenol
-
-
-
-
?
NADH + oxidized 2,6-dichlorophenolindophenol
NAD+ + H+ + reduced 2,6-dichlorophenolindophenol
-
-
-
-
r
NADH + oxidized 2,6-dichlorophenolindophenol
NAD+ + H+ + reduced 2,6-dichlorophenolindophenol
-
-
-
-
?
NADPH + ferricytochrome b5
NADP+ + H+ + ferrocytochrome b5
-
low affinity for NADPH
-
-
?
additional information
?
-
-
poor activity with the anticancer drug mitomycin C, no activity with anticancer drug idarubicin. The quinone antitumor agents are used in the treatment of several human neoplasms
-
-
?
additional information
?
-
-
role of enzyme in fatty acid desaturation and conjugation
-
-
?
additional information
?
-
role of enzyme in fatty acid desaturation and conjugation
-
-
?
