Information on EC 1.14.14.57 - taurochenodeoxycholate 6alpha-hydroxylase

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The enzyme appears in viruses and cellular organisms

EC NUMBER
COMMENTARY hide
1.14.14.57
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RECOMMENDED NAME
GeneOntology No.
taurochenodeoxycholate 6alpha-hydroxylase
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REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
lithocholate + [reduced NADPH-hemoprotein reductase] + O2 = hyodeoxycholate + [oxidized NADPH-hemoprotein reductase] + H2O
show the reaction diagram
(2)
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taurochenodeoxycholate + [reduced NADPH-hemoprotein reductase] + O2 = taurohyocholate + [oxidized NADPH-hemoprotein reductase] + H2O
show the reaction diagram
(1)
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SYSTEMATIC NAME
IUBMB Comments
taurochenodeoxycholate,[reduced NADPH-hemoprotein reductase]:oxygen oxidoreductase (6alpha-hydroxylating)
A heme-thiolate protein (P-450). Requires cytochrome b5 for maximal activity. Acts on taurochenodeoxycholate, taurodeoxycholate and less readily on lithocholate and chenodeoxycholate. In adult pig (Sus scrofa), hyocholic acid replaces cholic acid as a primary bile acid [5].
CAS REGISTRY NUMBER
COMMENTARY hide
105669-85-0
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ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
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Manually annotated by BRENDA team
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Manually annotated by BRENDA team
GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
physiological function
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a strong correlation exists between 6alpha-hydroxylation of taurochenodeoxycholic acid, CYP3A levels and testosterone 6beta-hydroxylation. There is also a strong correlation between 6alpha-hydroxylation of lithocholic acid, CYP3A levels and testosterone 6beta-hydroxylation
SUBSTRATE
PRODUCT                       
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
chenodeoxycholate + [reduced NADPH-hemoprotein reductase] + O2
hyocholate + [oxidized NADPH-hemoprotein reductase] + H2O
show the reaction diagram
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-
-
-
?
lithocholate + [reduced NADPH-hemoprotein reductase] + O2
hyocholate + [oxidized NADPH-hemoprotein reductase] + H2O
show the reaction diagram
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activity is low compared to activity with taurochenodeoxycholate
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-
?
lithocholate + [reduced NADPH-hemoprotein reductase] + O2
hyodeoxycholate + [oxidized NADPH-hemoprotein reductase] + H2O
show the reaction diagram
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-
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-
?
taurochenodeoxycholate + [reduced NADPH-hemoprotein reductase] + O2
taurohyocholate + [oxidized NADPH-hemoprotein reductase] + H2O
show the reaction diagram
additional information
?
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isofornm CYP3A4 is the only enzyme tested which is active towards bile acids taurochenodeoxycholate and lithocholate. The enzyme catalyzes an efficient 6alpha-hydroxylation of both taurochenodeoxycholic acid and lithocholic acid
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COFACTOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
cytochrome P450
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INHIBITORS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
troleandomycin
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0.01 mM, almost complete inhibition
additional information
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not inhibitory or very little effect: alpha-naphthoflavone, sulfaphenazole and tranylcypromine
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KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
0.0629 - 0.09
taurochenodeoxycholate
SOURCE TISSUE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
SOURCE
additional information
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expression is found in 4-day-old and 6-week-old pig liver, but not in fetal liver
Manually annotated by BRENDA team
LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY hide
GeneOntology No.
LITERATURE
SOURCE
MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
53000
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x * 53000, SDS-PAGE
SUBUNITS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
?
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x * 53000, SDS-PAGE
Purification/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
Cloned/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
6alpha-hydroxylase (CYP4A21) gene: evolution by gene duplication and gene conversion
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expression in insect cells
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transfection into COS cells
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APPLICATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
medicine
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vitamin D receptor deficiency in the intestine of mice exacerbates lithocholic acid-induced hepatotoxicity manifested by increased necrosis and inflammation, due in part to overaccumulation of hepatic bile acids including taurocholic acid and taurodeoxycholic acid. Intestinal expression of CYP3A4 in the Vitamin D receptor-deficient mouse line reduces lithocholic acid-induced hepatotoxicity through elevation of lithocholic acid metabolism and detoxification, and suppression of bile acid transporter expression in the small intestine