Page last updated: 2024-10-24

3-oxo-5alpha-steroid 4-dehydrogenase (NADP+) activity

Definition

Target type: molecularfunction

Catalysis of the reaction: 3-oxo-5alpha-steroid + NADP+ = a 3-oxo-delta(4)-steroid + H+ + NADPH. [EC:1.3.1.22, RHEA:54384]

3-oxo-5alpha-steroid 4-dehydrogenase (NADP+) activity catalyzes the conversion of a 3-oxo-5alpha-steroid to a 3-oxo-4-ene-5alpha-steroid. This enzyme is a member of the short-chain dehydrogenase/reductase (SDR) family. It utilizes NADP+ as a cofactor and is involved in the biosynthesis of steroids. Specifically, it plays a role in the synthesis of bile acids, androgens, and other steroids. The enzyme's mechanism involves the oxidation of the C4-hydrogen atom of the steroid substrate, followed by the transfer of two electrons to NADP+, which is reduced to NADPH. The reaction is stereospecific, with the hydrogen atom at the C4 position being removed from the alpha face of the steroid molecule. This activity is essential for the production of various hormones and other vital steroid compounds.'
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Proteins (2)

ProteinDefinitionTaxonomy
3-oxo-5-alpha-steroid 4-dehydrogenase 2A 3-oxo-5-alpha-steroid 4-dehydrogenase 2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P31213]Homo sapiens (human)
3-oxo-5-alpha-steroid 4-dehydrogenase 1A 3-oxo-5-alpha-steroid 4-dehydrogenase 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P18405]Homo sapiens (human)

Compounds (15)

CompoundDefinitionClassesRoles
prazosinprazosin : A member of the class of piperazines that is piperazine substituted by a furan-2-ylcarbonyl group and a 4-amino-6,7-dimethoxyquinazolin-2-yl group at positions 1 and 4 respectively.

Prazosin: A selective adrenergic alpha-1 antagonist used in the treatment of HEART FAILURE; HYPERTENSION; PHEOCHROMOCYTOMA; RAYNAUD DISEASE; PROSTATIC HYPERTROPHY; and URINARY RETENTION.
aromatic ether;
furans;
monocarboxylic acid amide;
piperazines;
quinazolines
alpha-adrenergic antagonist;
antihypertensive agent;
EC 3.4.21.26 (prolyl oligopeptidase) inhibitor
finasteridefinasteride : An aza-steroid that is a synthetic drug for the treatment of benign prostatic hyperplasia.

Finasteride: An orally active 3-OXO-5-ALPHA-STEROID 4-DEHYDROGENASE inhibitor. It is used as a surgical alternative for treatment of benign PROSTATIC HYPERPLASIA.
3-oxo steroid;
aza-steroid;
delta-lactam
androgen antagonist;
antihyperplasia drug;
EC 1.3.1.22 [3-oxo-5alpha-steroid 4-dehydrogenase (NADP(+))] inhibitor
turosterideturosteride: a 5alpha-reductase inhibitor; structure given in first source; RN given refers to the (5alpha,17beta)-isomer
sertralinesertraline : A member of the class of tetralins that is tetralin which is substituted at positions 1 and 4 by a methylamino and a 3,4-dichlorophenyl group, respectively (the S,S diastereoisomer). A selective serotonin-reuptake inhibitor (SSRI), it is administered orally as the hydrochloride salt as an antidepressant for the treatment of depression, obsessive-compulsive disorder, panic disorder and post-traumatic stress disorder.

Sertraline: A selective serotonin uptake inhibitor that is used in the treatment of depression.
dichlorobenzene;
secondary amino compound;
tetralins
antidepressant;
serotonin uptake inhibitor
epristerideepristeride: structure given in first sourcesteroid acid
indole-2-carboxylic acidindolyl carboxylic acid
fce 28260(22RS-N-1,1,1-trifluoro-2-phenylprop-2-yl)-3-oxo-4-aza-5alpha-androst-1-ene-17beta-carboxamide: structure given in first source
ly 300502
17-n,n-diethylcarbamoyl-4-methyl-4-azaandrostane-3-one17-N,N-diethylcarbamoyl-4-methyl-4-azaandrostane-3-one: inhibitor of testosterone 5-alpha reductase, receptor binding & nuclear uptake of androgens in the prostate
dutasteridedutasteride : An aza-steroid that is inasteride in which the tert-butyl group is replaced by a 2,5-bis(trifluoromethyl)phenyl group. A synthetic 4-azasteroid, dutasteride is a selective inhibitor of both the type 1 and type 2 isoforms of steroid 5alpha-reductase, an intracellular enzyme that converts testosterone to 5alpha-dihydrotestosterone. Dutasteride is used for the treatment of symptomatic benign prostatic hyperplasia in men with an enlarged prostate gland.

Dutasteride: A 5-ALPHA-REDUCTASE INHIBITOR that is reported to inhibit both type-1 and type2 isoforms of the enzyme and is used to treat BENIGN PROSTATIC HYPERPLASIA.
(trifluoromethyl)benzenes;
aza-steroid;
delta-lactam
antihyperplasia drug;
EC 1.3.1.22 [3-oxo-5alpha-steroid 4-dehydrogenase (NADP(+))] inhibitor
5-(2,5-difluorophenyl)-N-(2,6-dimethylphenyl)-2-furancarboxamidearomatic amide;
furans
5-(2,5-dichlorophenyl)-N-(2,6-dimethoxyphenyl)-2-furancarboxamidearomatic amide;
furans
5-(2,5-dichlorophenyl)-N-[2,6-di(propan-2-yl)phenyl]-2-furancarboxamidearomatic amide;
furans
5-(2,5-dichlorophenyl)-N-(2,6-diethylphenyl)-2-furancarboxamidearomatic amide;
furans
N-(2,6-dimethylphenyl)-5-(4-methyl-3-thiophenyl)-2-furancarboxamidearomatic amide;
furans