Enzymes
| UniProtKB help_outline | 1 proteins |
| Enzyme class help_outline |
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- Name help_outline 7β-hydroxy-3-oxochol-24-oyl-CoA Identifier CHEBI:140637 Charge -4 Formula C45H68N7O19P3S InChIKeyhelp_outline DDGZATCAACOBPH-NAUAOZFASA-J SMILEShelp_outline [C@@H]1(N2C3=C(C(=NC=N3)N)N=C2)O[C@H](COP(OP(OCC(C)([C@H](C(NCCC(NCCSC(=O)CC[C@@](C)([C@]4(CC[C@@]5([C@@]4(CC[C@@]6([C@]7(CCC(C[C@]7(C[C@@H]([C@@]56[H])O)[H])=O)C)[H])C)[H])[H])[H])=O)=O)O)C)(=O)[O-])(=O)[O-])[C@H]([C@H]1O)OP([O-])([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 1 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline NAD+ Identifier CHEBI:57540 (Beilstein: 3868403) help_outline Charge -1 Formula C21H26N7O14P2 InChIKeyhelp_outline BAWFJGJZGIEFAR-NNYOXOHSSA-M 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](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 1,142 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline 7β-hydroxy-3-oxochol-4-en-24-oyl-CoA Identifier CHEBI:140638 Charge -4 Formula C45H66N7O19P3S InChIKeyhelp_outline WTSQHJYZDLRRNB-ALVMJZEASA-J SMILEShelp_outline [C@@H]1(N2C3=C(C(=NC=N3)N)N=C2)O[C@H](COP(OP(OCC(C)([C@H](C(NCCC(NCCSC(=O)CC[C@@](C)([C@]4(CC[C@@]5([C@@]4(CC[C@@]6([C@]7(CCC(C=C7C[C@@H]([C@@]56[H])O)=O)C)[H])C)[H])[H])[H])=O)=O)O)C)(=O)[O-])(=O)[O-])[C@H]([C@H]1O)OP([O-])([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 1 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 9,176 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline NADH Identifier CHEBI:57945 (Beilstein: 3869564) help_outline Charge -2 Formula C21H27N7O14P2 InChIKeyhelp_outline BOPGDPNILDQYTO-NNYOXOHSSA-L 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](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 1,073 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:56668 | RHEA:56669 | RHEA:56670 | RHEA:56671 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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Expression of the bile acid-inducible NADH:flavin oxidoreductase gene of Eubacterium sp. VPI 12708 in Escherichia coli.
Baron S.F., Hylemon P.B.
The intestinal microorganism Eubacterium sp. VPI 12708 synthesizes a bile acid-inducible NADH:flavin oxidoreductase (NADH:FOR) which presumably functions in the 7 alpha-dehydroxylation of cholic acid to deoxycholic acid. The baiH gene encoding NADH:FOR was subcloned into an IPTG-inducible expressi ... >> More
The intestinal microorganism Eubacterium sp. VPI 12708 synthesizes a bile acid-inducible NADH:flavin oxidoreductase (NADH:FOR) which presumably functions in the 7 alpha-dehydroxylation of cholic acid to deoxycholic acid. The baiH gene encoding NADH:FOR was subcloned into an IPTG-inducible expression vector, pBaiH2.2. Escherichia coli DH5 alpha cells transformed with pBaiH2.2 expressed 10-fold higher levels of NADH:FOR upon induction with IPTG than did Eubacterium sp. VPI 12708 cells induced with cholic acid. The NADH:FOR produced by E. coli DH5 alpha(pBaiH2.2) was purified to > 95% electrophoretic homogeneity in three steps. The purified NADH:FOR was similar to that of Eubacterium sp. VPI 12708 in subunit and native M(r) (ca. 72,000 and 210,000, respectively), pH optimum, sensitivity to inhibitors, and electron acceptor specificity. It contained 1 mol of FAD, up to 2 mol of iron, and 1 mol of copper per mol of subunit. The enzyme reduced synthetic quinones, dyes, flavins, and O2 with NADH as the electron donor, but did not reduce disulfide compounds, various unsaturated bile acids, cytochrome c, physiological quinones, or cell fractions from Eubacterium sp. VPI 12708. Addition of purified NADH:FOR to Eubacterium sp. VPI 12708 cell extracts altered the balance of oxidized and reduced bile acid intermediates produced during cholic acid 7 alpha-dehydroxylation, suggesting that the enzyme may regulate the cellular ratio of NAD to NADH. << Less
Biochim. Biophys. Acta 1249:145-154(1995) [PubMed] [EuropePMC]
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Characterization of the baiH gene encoding a bile acid-inducible NADH:flavin oxidoreductase from Eubacterium sp. strain VPI 12708.
Franklund C.V., Baron S.F., Hylemon P.B.
A cholate-inducible, NADH-dependent flavin oxidoreductase from the intestinal bacterium Eubacterium sp. strain VPI 12708 was purified 372-fold to apparent electrophoretic homogeneity. The subunit and native molecular weights were estimated to be 72,000 and 210,000, respectively, suggesting a homot ... >> More
A cholate-inducible, NADH-dependent flavin oxidoreductase from the intestinal bacterium Eubacterium sp. strain VPI 12708 was purified 372-fold to apparent electrophoretic homogeneity. The subunit and native molecular weights were estimated to be 72,000 and 210,000, respectively, suggesting a homotrimeric organization. Three peaks of NADH:flavin oxidoreductase activity (forms I, II, and III) eluted from a DEAE-high-performance liquid chromatography column. Absorption spectra revealed that purified form III, but not form I, contained bound flavin, which dissociated during purification to generate form I. Enzyme activity was inhibited by sulfhydryl-reactive compounds, acriflavine, o-phenanthroline, and EDTA. Activity assays and Western blot (immunoblot) analysis confirmed that expression of the enzyme was cholate inducible. The first 25 N-terminal amino acid residues of purified NADH:flavin oxidoreductase were determined, and a corresponding oligonucleotide probe was synthesized for use in cloning of the associated gene, baiH. Restriction mapping, sequence data, and RNA blot analysis suggested that the baiH gene was located on a previously described, cholate-inducible operon > or = 10 kb long. The baiH gene encoded a 72,006-Da polypeptide containing 661 amino acids. The deduced amino acid sequence of the baiH gene was homologous to that of NADH oxidase from Thermoanaerobium brockii, trimethylamine dehydrogenase from methylotrophic bacterium W3A1, Old Yellow Enzyme from Saccharomyces carlsbergensis, and the product of the baiC gene of Eubacterium sp. strain VPI 12708, located upstream from the baiH gene in the cholate-inducible operon. Alignment of these five sequences revealed potential ligands for an iron-sulfur cluster, a putative flavin adenine dinucleotide-binding domain, and two other well-conserved domains of unknown function. << Less
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Clostridium scindens baiCD and baiH genes encode stereo-specific 7alpha/7beta-hydroxy-3-oxo-delta4-cholenoic acid oxidoreductases.
Kang D.J., Ridlon J.M., Moore D.R. II, Barnes S., Hylemon P.B.
Secondary bile acids, formed by intestinal bacteria, are suggested to play a significant role in cancers of the gastrointestinal tract in humans. Bile acid 7alpha/beta-dehydroxylation is carried out by a few species of intestinal clostridia which harbor a multi-gene bile acid inducible (bai) opero ... >> More
Secondary bile acids, formed by intestinal bacteria, are suggested to play a significant role in cancers of the gastrointestinal tract in humans. Bile acid 7alpha/beta-dehydroxylation is carried out by a few species of intestinal clostridia which harbor a multi-gene bile acid inducible (bai) operon. Several genes encoding enzymes in this pathway have been cloned and characterized. However, no gene product(s) has yet been assigned to the production of 3-oxo-Delta4-cholenoic acid intermediates of cholic acid (CA), chenodeoxycholic acid (CDCA) or ursodeoxycholic acid (UDCA). We previously reported that the baiH gene encodes an NADH:flavin oxidoreductase (NADH:FOR); however, the role of this protein in bile acid 7-dehydroxylation is unclear. Homology searches and secondary structural alignments suggest this protein to be similar to flavoproteins which reduce alpha/beta-unsaturated carbonyl compounds. The baiH gene product was expressed in Escherichia coli, purified and discovered to be a stereo-specific NAD(H)-dependent 7beta-hydroxy-3-oxo-Delta4-cholenoic acid oxidoreductase. Additionally, high sequence similarity between the baiH and baiCD gene products suggests the baiCD gene may encode a 3-oxo-Delta4-cholenoic acid oxidoreductase specific for CDCA and CA. We tested this hypothesis using cell extracts prepared from E. coli overexpressing the baiCD gene and discovered that it encodes a stereo-specific NAD(H)-dependent 7alpha-hydroxy-3-oxo-Delta4-cholenoic acid oxidoreductase. << Less
Biochim. Biophys. Acta 1781:16-25(2008) [PubMed] [EuropePMC]
This publication is cited by 2 other entries.