Enzymes
| UniProtKB help_outline | 998 proteins |
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- Name help_outline NADP+ Identifier CHEBI:58349 Charge -3 Formula C21H25N7O17P3 InChIKeyhelp_outline XJLXINKUBYWONI-NNYOXOHSSA-K SMILEShelp_outline NC(=O)c1ccc[n+](c1)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](OP([O-])([O-])=O)[C@@H]2O)n2cnc3c(N)ncnc23)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1,285 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline taurochenodeoxycholate Identifier CHEBI:9407 (Beilstein: 3919127) help_outline Charge -1 Formula C26H44NO6S InChIKeyhelp_outline BHTRKEVKTKCXOH-BJLOMENOSA-M SMILEShelp_outline [H][C@@]12C[C@H](O)CC[C@]1(C)[C@@]1([H])CC[C@]3(C)[C@]([H])(CC[C@@]3([H])[C@]1([H])[C@H](O)C2)[C@H](C)CCC(=O)NCCS([O-])(=O)=O 2D coordinates Mol file for the small molecule Search links Involved in 10 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline 7-oxotaurolithocholate Identifier CHEBI:137724 Charge -1 Formula C26H42NO6S InChIKeyhelp_outline QNRIYEYAHVEGQJ-SWQVIYSDSA-M SMILEShelp_outline C1[C@@]2([C@]3(CC[C@]4([C@]([C@@]3(C(C[C@@]2(C[C@@H](C1)O)[H])=O)[H])(CC[C@@]4([C@@H](CCC(NCCS([O-])(=O)=O)=O)C)[H])[H])C)[H])C 2D coordinates Mol file for the small molecule Search links Involved in 3 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H+ Identifier CHEBI:15378 Charge 1 Formula H InChIKeyhelp_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILEShelp_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,431 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline NADPH Identifier CHEBI:57783 (Beilstein: 10411862) help_outline Charge -4 Formula C21H26N7O17P3 InChIKeyhelp_outline ACFIXJIJDZMPPO-NNYOXOHSSA-J SMILEShelp_outline NC(=O)C1=CN(C=CC1)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](OP([O-])([O-])=O)[C@@H]2O)n2cnc3c(N)ncnc23)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1,279 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:65060 | RHEA:65061 | RHEA:65062 | RHEA:65063 | |
|---|---|---|---|---|
| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
| UniProtKB help_outline |
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Related reactions help_outline
More general form(s) of this reaction
Publications
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Hepatic reduction of the secondary bile acid 7-oxolithocholic acid is mediated by 11beta-hydroxysteroid dehydrogenase 1.
Odermatt A., Da Cunha T., Penno C.A., Chandsawangbhuwana C., Reichert C., Wolf A., Dong M., Baker M.E.
The oxidized bile acid 7-oxoLCA (7-oxolithocholic acid), formed primarily by gut micro-organisms, is reduced in human liver to CDCA (chenodeoxycholic acid) and, to a lesser extent, UDCA (ursodeoxycholic acid). The enzyme(s) responsible remained unknown. Using human liver microsomes, we observed en ... >> More
The oxidized bile acid 7-oxoLCA (7-oxolithocholic acid), formed primarily by gut micro-organisms, is reduced in human liver to CDCA (chenodeoxycholic acid) and, to a lesser extent, UDCA (ursodeoxycholic acid). The enzyme(s) responsible remained unknown. Using human liver microsomes, we observed enhanced 7-oxoLCA reduction in the presence of detergent. The reaction was dependent on NADPH and stimulated by glucose 6-phosphate, suggesting localization of the enzyme in the ER (endoplasmic reticulum) and dependence on NADPH-generating H6PDH (hexose-6-phosphate dehydrogenase). Using recombinant human 11β-HSD1 (11β-hydroxysteroid dehydrogenase 1), we demonstrate efficient conversion of 7-oxoLCA into CDCA and, to a lesser extent, UDCA. Unlike the reversible metabolism of glucocorticoids, 11β-HSD1 mediated solely 7-oxo reduction of 7-oxoLCA and its taurine and glycine conjugates. Furthermore, we investigated the interference of bile acids with 11β-HSD1-dependent interconversion of glucocorticoids. 7-OxoLCA and its conjugates preferentially inhibited cortisone reduction, and CDCA and its conjugates inhibited cortisol oxidation. Three-dimensional modelling provided an explanation for the binding mode and selectivity of the bile acids studied. The results reveal that 11β-HSD1 is responsible for 7-oxoLCA reduction in humans, providing a further link between hepatic glucocorticoid activation and bile acid metabolism. These findings also suggest the need for animal and clinical studies to explore whether inhibition of 11β-HSD1 to reduce cortisol levels would also lead to an accumulation of 7-oxoLCA, thereby potentially affecting bile acid-mediated functions. << Less
Biochem. J. 436:621-629(2011) [PubMed] [EuropePMC]
This publication is cited by 5 other entries.
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Carboxyl-terminal and Arg38 are essential for activity of the 7alpha-hydroxysteroid dehydrogenase from Clostridium absonum.
Lou D., Wang B., Tan J., Zhu L.
7α-hydroxysteroid dehydrogenase (7α-HSDH, EC 1.1.1.159), one of the short-chain dehydrogenase/reductase superfamily, catalyzes the dehydrogenation of C7 hydroxyl group of the steroid skeleton of bile acids. Clostridium absonum 7α-HSDH (Ca 7α-HSDH) was cloned and heterologously expressed in Escheri ... >> More
7α-hydroxysteroid dehydrogenase (7α-HSDH, EC 1.1.1.159), one of the short-chain dehydrogenase/reductase superfamily, catalyzes the dehydrogenation of C7 hydroxyl group of the steroid skeleton of bile acids. Clostridium absonum 7α-HSDH (Ca 7α-HSDH) was cloned and heterologously expressed in Escherichia coli. The function of carboxyterminal (C-terminal) and Arg38 of Ca 7α-HSDH was investigated through truncations and site-directed mutagenesis, respectively. When 2 and 6 amino acids of C-terminal were removed, the catalytic efficiency (k(cat)/K(m)) of Ca 7α-HSDH remained 19.1% and 2.5%, respectively. Furthermore, the activity could not be detected after 8, 14 and 17 amino acids were deleted. No activity could be detected with coenzyme either NADP(+) or NAD(+) after replacement of arginine at position 38 by aspartic acid. The metal ions Mg(2+) (50 mM), Na(+) (200 mM) and K(+) (500 mM) could maximally improve the activity of Ca 7α-HSDH by 61.4%, 64.7% and 105.7%, respectively. The activity had no significant change after incubation at 4 or 25 °C for 108 h, but decreased dramatically at 37 °C. Our study confirmed that C-terminal and Arg38 were essential for the catalytic function of Ca 7α-HSDH and the enzyme activity can be improved by metal ions. << Less
Protein Pept. Lett. 21:894-900(2014) [PubMed] [EuropePMC]
This publication is cited by 2 other entries.