Target type: molecularfunction
Catalysis of the reaction: a 3-oxo-delta(5)-steroid = a 3-oxo-delta(4)-steroid. [EC:5.3.3.1]
Steroid delta-isomerase activity catalyzes the isomerization of double bonds in steroid molecules. This enzymatic activity is crucial for the biosynthesis of various steroid hormones, including testosterone, estrogen, and cortisol. Specifically, it involves the conversion of a delta-4 double bond to a delta-5 double bond or vice versa, depending on the specific enzyme and substrate. This process typically occurs in the steroidogenic pathway, where steroid precursors are converted into active hormones. The mechanism of action involves the formation of a carbocation intermediate, which is stabilized by the enzyme. The enzyme then facilitates the transfer of a hydrogen atom from one carbon atom to another, resulting in the isomerization of the double bond. Delta-isomerase activity is essential for maintaining hormonal balance in the body, and its dysregulation can lead to various diseases, including hormone deficiencies and cancers.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| 3-beta-hydroxysteroid-Delta(8),Delta(7)-isomerase | A 3-beta-hydroxysteroid-Delta(8),Delta(7)-isomerase that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q15125] | Homo sapiens (human) |
| 3-beta-hydroxysteroid-Delta(8),Delta(7)-isomerase | A 3-beta-hydroxysteroid-Delta(8),Delta(7)-isomerase that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q15125] | Homo sapiens (human) |
| 3 beta-hydroxysteroid dehydrogenase/Delta 5-->4-isomerase type 1 | A 3 beta-hydroxysteroid dehydrogenase/Delta 5-->4-isomerase type 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P14060] | Homo sapiens (human) |
| Glutathione S-transferase A1 | A glutathione S-transferase A1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P08263] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| amiodarone | amiodarone : A member of the class of 1-benzofurans that is 1-benzofuran substituted by a butyl group at position 2 and a 4-[2-(diethylamino)ethoxy]-3,5-diiodobenzoyl group at position 3. It is a cardiovascular drug used for the treatment of cardiac dysrhythmias. Amiodarone: An antianginal and class III antiarrhythmic drug. It increases the duration of ventricular and atrial muscle action by inhibiting POTASSIUM CHANNELS and VOLTAGE-GATED SODIUM CHANNELS. There is a resulting decrease in heart rate and in vascular resistance. | 1-benzofurans; aromatic ketone; organoiodine compound; tertiary amino compound | cardiovascular drug |
| buflomedil | buflomedil: RN given refers to parent cpd; synonym LL 1656 refers to HCl; structure | aromatic ketone | |
| ethacrynic acid | etacrynic acid : An aromatic ether that is phenoxyacetic acid in which the phenyl ring is substituted by chlorines at positions 2 and 3, and by a 2-methylidenebutanoyl group at position 4. It is a loop diuretic used to treat high blood pressure resulting from diseases such as congestive heart failure, liver failure, and kidney failure. It is also a glutathione S-transferase (EC 2.5.1.18) inhibitor. Ethacrynic Acid: A compound that inhibits symport of sodium, potassium, and chloride primarily in the ascending limb of Henle, but also in the proximal and distal tubules. This pharmacological action results in excretion of these ions, increased urinary output, and reduction in extracellular fluid. This compound has been classified as a loop or high ceiling diuretic. | aromatic ether; aromatic ketone; dichlorobenzene; monocarboxylic acid | EC 2.5.1.18 (glutathione transferase) inhibitor; ion transport inhibitor; loop diuretic |
| haloperidol | haloperidol : A compound composed of a central piperidine structure with hydroxy and p-chlorophenyl substituents at position 4 and an N-linked p-fluorobutyrophenone moiety. Haloperidol: A phenyl-piperidinyl-butyrophenone that is used primarily to treat SCHIZOPHRENIA and other PSYCHOSES. It is also used in schizoaffective disorder, DELUSIONAL DISORDERS, ballism, and TOURETTE SYNDROME (a drug of choice) and occasionally as adjunctive therapy in INTELLECTUAL DISABILITY and the chorea of HUNTINGTON DISEASE. It is a potent antiemetic and is used in the treatment of intractable HICCUPS. (From AMA Drug Evaluations Annual, 1994, p279) | aromatic ketone; hydroxypiperidine; monochlorobenzenes; organofluorine compound; tertiary alcohol | antidyskinesia agent; antiemetic; dopaminergic antagonist; first generation antipsychotic; serotonergic antagonist |
| nafoxidine | Nafoxidine: An estrogen antagonist that has been used in the treatment of breast cancer. | benzenes; naphthalenes; ring assembly | |
| raloxifene | raloxifene : A member of the class of 1-benzothiophenes that is 1-benzothiophene in which the hydrogens at positions 2, 3, and 6 have been replaced by p-hydroxyphenyl, p-[2-(piperidin-1-yl)ethoxy]benzoyl, and hydroxy groups, respectively. | 1-benzothiophenes; aromatic ketone; N-oxyethylpiperidine; phenols | bone density conservation agent; estrogen antagonist; estrogen receptor modulator |
| trifluoperazine | N-alkylpiperazine; N-methylpiperazine; organofluorine compound; phenothiazines | antiemetic; calmodulin antagonist; dopaminergic antagonist; EC 1.8.1.12 (trypanothione-disulfide reductase) inhibitor; EC 5.3.3.5 (cholestenol Delta-isomerase) inhibitor; phenothiazine antipsychotic drug | |
| trifluperidol | Trifluperidol: A butyrophenone with general properties similar to those of HALOPERIDOL. It is used in the treatment of PSYCHOSES including MANIA and SCHIZOPHRENIA. (From Martindale, The Extra Pharmacopoeia, 30th ed, p621) | aromatic ketone | |
| corticosterone | 11beta-hydroxy steroid; 20-oxo steroid; 21-hydroxy steroid; 3-oxo-Delta(4) steroid; C21-steroid; glucocorticoid; primary alpha-hydroxy ketone | human metabolite; mouse metabolite | |
| triparanol | Triparanol: Antilipemic agent with high ophthalmic toxicity. According to Merck Index, 11th ed, the compound was withdrawn from the market in 1962 because of its association with the formation of irreversible cataracts. | stilbenoid | anticoronaviral agent |
| 1,3-ditolylguanidine | 1,3-ditolylguanidine: structure given in first source; a selective ligand for the sigma binding sites in the brain | toluenes | |
| opipramol | Opipramol: A tricyclic antidepressant with actions similar to AMITRIPTYLINE. | dibenzoazepine | |
| jervine | jervine: teratogen from Veratrum grandiflorum; RN given refers to parent cpd(3beta,23beta)-isomer; structure | piperidines | |
| naftifine | naftifine : A tertiary amine in which the nitrogen is substituted by methyl, alpha-naphthylmethyl, and (1E)-cinnamyl groups. It is used (usually as its hydrochloride salt) for the treatment of fungal skin infections. naftifine: allylamine der; RN given refers to unlabeled parent cpd | allylamine antifungal drug; naphthalenes; tertiary amine | EC 1.14.13.132 (squalene monooxygenase) inhibitor; sterol biosynthesis inhibitor |
| carbizocaine | |||
| finasteride | finasteride : 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 |
| fenpropimorph | alkylbenzene | ||
| chrysamine g | chrysamine G: structure given in first source; RN refers to disodium salt | ||
| preclamol | |||
| enclomiphene | Enclomiphene: The trans or (E)-isomer of clomiphene. | ||
| zuclomiphene | Zuclomiphene: The cis or (Z)-isomer of clomiphene. | stilbenoid | |
| terbinafine | acetylenic compound; allylamine antifungal drug; enyne; naphthalenes; tertiary amine | EC 1.14.13.132 (squalene monooxygenase) inhibitor; P450 inhibitor; sterol biosynthesis inhibitor | |
| tamoxifen | stilbenoid; tertiary amino compound | angiogenesis inhibitor; antineoplastic agent; bone density conservation agent; EC 1.2.3.1 (aldehyde oxidase) inhibitor; EC 2.7.11.13 (protein kinase C) inhibitor; estrogen antagonist; estrogen receptor antagonist; estrogen receptor modulator | |
| bm 15766 | BM 15766: 7-dehydrocholesterol reductase antagonist | ||
| ne 100 | |||
| sa 4503 |