Enzymes
| UniProtKB help_outline | 9 proteins |
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- Name help_outline 5α-androstane-3β,17β-diol Identifier CHEBI:18329 (Beilstein: 2559488; CAS: 571-20-0) help_outline Charge 0 Formula C19H32O2 InChIKeyhelp_outline CBMYJHIOYJEBSB-YSZCXEEOSA-N SMILEShelp_outline [H][C@@]12CC[C@@]3([H])[C@]4([H])CC[C@H](O)[C@@]4(C)CC[C@]3([H])[C@@]1(C)CC[C@H](O)C2 2D coordinates Mol file for the small molecule Search links Involved in 4 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 1,186 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline 17β-hydroxy-5α-androstan-3-one Identifier CHEBI:16330 (CAS: 521-18-6) help_outline Charge 0 Formula C19H30O2 InChIKeyhelp_outline NVKAWKQGWWIWPM-ABEVXSGRSA-N SMILEShelp_outline [H][C@@]12CC[C@@]3([H])[C@]4([H])CC[C@H](O)[C@@]4(C)CC[C@]3([H])[C@@]1(C)CCC(=O)C2 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 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 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 1,116 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:42184 | RHEA:42185 | RHEA:42186 | RHEA:42187 | |
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| 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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Further characterization of human microsomal 3alpha-hydroxysteroid dehydrogenase.
Chetyrkin S.V., Hu J., Gough W.H., Dumaual N., Kedishvili N.Y.
This manuscript reports further characterization of the recently discovered human short-chain alcohol dehydrogenase, proposed to oxidize 3alpha-androstanediol to dihydrotestosterone in testis and prostate (M. G. Biswas and D. W. Russell, 1997, J. Biol. Chem. 272, 15959-15966). Enzyme expressed usi ... >> More
This manuscript reports further characterization of the recently discovered human short-chain alcohol dehydrogenase, proposed to oxidize 3alpha-androstanediol to dihydrotestosterone in testis and prostate (M. G. Biswas and D. W. Russell, 1997, J. Biol. Chem. 272, 15959-15966). Enzyme expressed using the Baculovirus System localized in the microsomal fraction and catalyzed oxidation and reduction of the functional groups on steroids at carbons 3 and 17. Autoradiography assays revealed that the enzyme was most efficient as a 3alpha-hydroxysteroid oxidoreductase. High affinity of the enzyme for NADH (Km of 0.18 microM), lack of stereospecificity in the reductive direction, and poor efficiency for 3beta-versus 3alpha-hydroxyl oxidation could account for the observed transient accumulation of 3beta-stereoisomers in the oxidative reaction. Consistent with the 65% sequence identity with RoDH dehydrogenases, the enzyme oxidized all-trans-retinol with the Km value of 3.2 microM and Vmax value of 1.2 nmol/min per milligram microsomes. 13-cis-Retinol and all-trans-retinol bound to the cellular retinol-binding protein were not substrates. Neurosteroid allopregnanolone was a better substrate than all-trans-retinol with the Km and Vmax values of 0.24 microM and 14.7 nmol/min per milligram microsomes. Northern blot analysis revealed that the corresponding mRNA was present in adult human brain (caudate nucleus, amygdala, hippocampus, substantia nigra, thalamus) and spinal cord in addition to other tissues. The message was also detected in fetal lung, liver, and brain. Antibodies against the enzyme recognized a protein of approximately 35 kDa in the particulate fraction of human tissues. This study presents new information about enzymatic properties, substrate specificity, and tissue distribution of this enzyme, and provides a better insight into its possible physiological function(s). << Less
Arch. Biochem. Biophys. 386:1-10(2001) [PubMed] [EuropePMC]
This publication is cited by 5 other entries.
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Human cytosolic 3alpha-hydroxysteroid dehydrogenases of the aldo-keto reductase superfamily display significant 3beta-hydroxysteroid dehydrogenase activity: implications for steroid hormone metabolism and action.
Steckelbroeck S., Jin Y., Gopishetty S., Oyesanmi B., Penning T.M.
The source of NADPH-dependent cytosolic 3beta-hydroxysteroid dehydrogenase (3beta-HSD) activity is unknown to date. This important reaction leads e.g. to the reduction of the potent androgen 5alpha-dihydrotestosterone (DHT) into inactive 3beta-androstanediol (3beta-Diol). Four human cytosolic aldo ... >> More
The source of NADPH-dependent cytosolic 3beta-hydroxysteroid dehydrogenase (3beta-HSD) activity is unknown to date. This important reaction leads e.g. to the reduction of the potent androgen 5alpha-dihydrotestosterone (DHT) into inactive 3beta-androstanediol (3beta-Diol). Four human cytosolic aldo-keto reductases (AKR1C1-AKR1C4) are known to act as non-positional-specific 3alpha-/17beta-/20alpha-HSDs. We now demonstrate that AKR1Cs catalyze the reduction of DHT into both 3alpha- and 3beta-Diol (established by (1)H NMR spectroscopy). The rates of 3alpha-versus 3beta-Diol formation varied significantly among the isoforms, but with each enzyme both activities were equally inhibited by the nonsteroidal anti-inflammatory drug flufenamic acid. In vitro, AKR1Cs also expressed substantial 3alpha[17beta]-hydroxysteroid oxidase activity with 3alpha-Diol as the substrate. However, in contrast to the 3-ketosteroid reductase activity of the enzymes, their hydroxysteroid oxidase activity was potently inhibited by low micromolar concentrations of the opposing cofactor (NADPH). This indicates that in vivo all AKR1Cs will preferentially work as reductases. Human hepatoma (HepG2) cells (which lack 3beta-HSD/Delta(5-4) ketosteroid isomerase mRNA expression, but express AKR1C1-AKR1C3) were able to convert DHT into 3alpha- and 3beta-Diol. This conversion was inhibited by flufenamic acid establishing the in vivo significance of the 3alpha/3beta-HSD activities of the AKR1C enzymes. Molecular docking simulations using available crystal structures of AKR1C1 and AKR1C2 demonstrated how 3alpha/3beta-HSD activities are achieved. The observation that AKR1Cs are a source of 3beta-tetrahydrosteroids is of physiological significance because: (i) the formation of 3beta-Diol (in contrast to 3alpha-Diol) is virtually irreversible, (ii) 3beta-Diol is a pro-apoptotic ligand for estrogen receptor beta, and (iii) 3beta-tetrahydrosteroids act as gamma-aminobutyric acid type A receptor antagonists. << Less
J. Biol. Chem. 279:10784-10795(2004) [PubMed] [EuropePMC]
This publication is cited by 4 other entries.
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Characterization, expression, and immunohistochemical localization of 3 beta-hydroxysteroid dehydrogenase/delta 5-delta 4 isomerase in human skin.
Dumont M., Van L.T., Dupont E., Pelletier G., Labrie F.
Three beta-hydroxysteroid dehydrogenase/delta 5-delta 4 isomerase (3 beta-HSD) catalyses an obligatory step in the biosynthesis of all classes of hormonal steroids, namely, the oxidation/isomerization of 3 beta-hydroxy-5-ene steroids into the corresponding 3-keto-4-ene steroids in gonadal as well ... >> More
Three beta-hydroxysteroid dehydrogenase/delta 5-delta 4 isomerase (3 beta-HSD) catalyses an obligatory step in the biosynthesis of all classes of hormonal steroids, namely, the oxidation/isomerization of 3 beta-hydroxy-5-ene steroids into the corresponding 3-keto-4-ene steroids in gonadal as well as in peripheral tissues. Because humans are unique with some primates in having adrenals that secrete large amounts of the steroid precursors dehydropiandrosterone (DHEA) and its sulfate (DHEA-S) and its exceptionally large volume makes the skin an important site of steroid biosynthesis, we have isolated and characterized cDNA clones encoding 3 beta-hydroxysteroid dehydrogenase/delta 5-delta 4 isomerase from a human skin lambda gt11 library. The longest clone obtained contains the entire coding sequence for type I 3 beta-HSD (372 amino acids) as well as an additional 131 nucleotides in the 5'-untranslated region. The insert of 1647 bp containing the entire coding region has been inserted in a pCMV expression vector and transfected into human cervical carcinoma cells (HeLa). The expressed enzyme efficiently catalyzes the transformation of pregnenolone, DHEA, and dihydrotestosterone into progesterone, 4-androstenedione, and 5 alpha-androstane-3 beta, 17 beta-diol, respectively. Using the enzyme expressed in HeLa cells, we have shown cyproterone acetate, a progestin used in the treatment of acne and hirsutism, as well as norgestrel and norethindrone, two steroids widely used as oral contraceptives, to be relatively potent inhibitors, with Ki values of 0.38 microM, 1.3 microM, and 1.2 microM, respectively. Immunohistochemical localization of 3 beta-HSD, illustrated by using an antibody raised against human placental 3 beta-HSD, shows that the enzyme is localized in sebaceous glands. << Less
J. Invest. Dermatol. 99:415-421(1992) [PubMed] [EuropePMC]
This publication is cited by 4 other entries.