Target type: biologicalprocess
A transcription regulation process in which the presence of one nitrogen source leads to an increase in the frequency, rate, or extent of transcription, from an RNA polymerase II promoter, of specific genes involved in the metabolism of other nitrogen sources. [GOC:mah, GOC:txnOH, PMID:19104072]
Nitrogen catabolite repression (NCR) is a regulatory mechanism that allows bacteria to prioritize the utilization of preferred carbon sources, such as glucose, over less favorable ones. This process is mediated by the cyclic AMP receptor protein (CRP) and its co-factor, cyclic AMP (cAMP), which together form a complex that acts as a transcription activator.
When glucose is present, the intracellular concentration of cAMP is low, and CRP is inactive. As glucose is depleted, the cAMP concentration increases, leading to the formation of the active CRP-cAMP complex. This complex binds to specific DNA sequences called CRP-binding sites, which are located upstream of the promoters of many genes involved in the utilization of alternative carbon sources.
The binding of CRP-cAMP to these sites enhances the recruitment of RNA polymerase II (RNAP II) to the promoter, resulting in increased transcription of the corresponding genes.
In summary, the biological process of nitrogen catabolite activation of transcription from an RNA polymerase II promoter involves the following steps:
1. Glucose depletion leads to an increase in cAMP levels.
2. cAMP binds to CRP, activating it.
3. The CRP-cAMP complex binds to CRP-binding sites upstream of target gene promoters.
4. CRP-cAMP facilitates the recruitment of RNAP II to the promoter, promoting transcription.
This process ensures that the expression of genes encoding enzymes for the utilization of alternative carbon sources is only activated when glucose is scarce, allowing bacteria to optimize their metabolism.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Bile acid receptor | A bile acid receptor that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q96RI1] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| benzbromarone | benzbromarone : 1-Benzofuran substituted at C-2 and C-3 by an ethyl group and a 3,5-dibromo-4-hydroxybenzoyl group respectively. An inhibitor of CYP2C9, it is used as an anti-gout medication. Benzbromarone: Uricosuric that acts by increasing uric acid clearance. It is used in the treatment of gout. | 1-benzofurans; aromatic ketone | uricosuric drug |
| clotrimazole | conazole antifungal drug; imidazole antifungal drug; imidazoles; monochlorobenzenes | antiinfective agent; environmental contaminant; xenobiotic | |
| felodipine | felodipine : The mixed (methyl, ethyl) diester of 4-(2,3-dichlorophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylic acid. A calcium-channel blocker, it lowers blood pressure by reducing peripheral vascular resistance through a highly selective action on smooth muscle in arteriolar resistance vessels. It is used in the management of hypertension and angina pectoris. Felodipine: A dihydropyridine calcium antagonist with positive inotropic effects. It lowers blood pressure by reducing peripheral vascular resistance through a highly selective action on smooth muscle in arteriolar resistance vessels. | dichlorobenzene; dihydropyridine; ethyl ester; methyl ester | anti-arrhythmia drug; antihypertensive agent; calcium channel blocker; vasodilator agent |
| flutrimazole | flutrimazole : An imidazole antifungal agent that is imidazole in which the hydrogen attached to the nitrogen is replaced by a 2,4'-difluorotrityl group. A topical antifungal agent which displays potent broad-spectrum in vitro activity against dermatophytes, filamentous fungi and yeasts. | imidazole antifungal drug; imidazoles; monofluorobenzenes | EC 1.14.13.70 (sterol 14alpha-demethylase) inhibitor |
| loratadine | loratadine : A benzocycloheptapyridine that is 6,11-dihydro-5H-benzo[5,6]cyclohepta[1,2-b]pyridine substituted by a chloro group at position 8 and a 1-(ethoxycarbonyl)piperidin-4-ylidene group at position 11. It is a H1-receptor antagonist commonly employed in the treatment of allergic disorders. Loratadine: A second-generation histamine H1 receptor antagonist used in the treatment of allergic rhinitis and urticaria. Unlike most classical antihistamines (HISTAMINE H1 ANTAGONISTS) it lacks central nervous system depressing effects such as drowsiness. | benzocycloheptapyridine; ethyl ester; N-acylpiperidine; organochlorine compound; tertiary carboxamide | anti-allergic agent; cholinergic antagonist; geroprotector; H1-receptor antagonist |
| nimodipine | nimodipine : A dihydropyridine that is 1,4-dihydropyridine which is substituted by methyl groups at positions 2 and 6, a (2-methoxyethoxy)carbonyl group at position 3, a m-nitrophenyl group at position 4, and an isopropoxycarbonyl group at position 5. An L-type calcium channel blocker, it acts particularly on cerebral circulation, and is used both orally and intravenously for the prevention and treatment of subarachnoid hemorrhage from ruptured intracranial aneurysm. Nimodipine: A calcium channel blockader with preferential cerebrovascular activity. It has marked cerebrovascular dilating effects and lowers blood pressure. | 2-methoxyethyl ester; C-nitro compound; dicarboxylic acids and O-substituted derivatives; diester; dihydropyridine; isopropyl ester | antihypertensive agent; calcium channel blocker; cardiovascular drug; vasodilator agent |
| ono 1078 | pranlukast: SRS-A antagonist; leukotriene D4 receptor antagonist | chromones | |
| 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 |
| sulconazole | 1-{2-[(4-chlorobenzyl)sulfanyl]-2-(2,4-dichlorophenyl)ethyl}-1H-imidazole : A member of the class of imidazoles that is 1-ethyl-1H-imidazole in which one of the hydrogens of the methyl group is replaced by a (4-chlorobenzyl)sulfanediyl group while a second is replaced by a 2,4-dichlorophenyl group. sulconazole : A racemate comprising equimolar amounts of (R)- and (S)-sulconazole. An antifungal agent with activity against Candida species, it is used (generally as the nitrate salt) for the topical treatment of fungal skin infections. sulconazole: RN given refers to cpd with unspecified isomeric designation; structure given in first source | dichlorobenzene; imidazoles; monochlorobenzenes; organic sulfide | |
| thyroxine | thyroxine : An iodothyronine compound having iodo substituents at the 3-, 3'-, 5- and 5'-positions. Thyroxine: The major hormone derived from the thyroid gland. Thyroxine is synthesized via the iodination of tyrosines (MONOIODOTYROSINE) and the coupling of iodotyrosines (DIIODOTYROSINE) in the THYROGLOBULIN. Thyroxine is released from thyroglobulin by proteolysis and secreted into the blood. Thyroxine is peripherally deiodinated to form TRIIODOTHYRONINE which exerts a broad spectrum of stimulatory effects on cell metabolism. | 2-halophenol; iodophenol; L-phenylalanine derivative; non-proteinogenic L-alpha-amino acid; thyroxine; thyroxine zwitterion | antithyroid drug; human metabolite; mouse metabolite; thyroid hormone |
| lithocholic acid | lithocholate : A bile acid anion that is the conjugate base of lithocholic acid. lithocholic acid : A monohydroxy-5beta-cholanic acid with a alpha-hydroxy substituent at position 3. It is a bile acid obtained from chenodeoxycholic acid by bacterial action. Lithocholic Acid: A bile acid formed from chenodeoxycholate by bacterial action, usually conjugated with glycine or taurine. It acts as a detergent to solubilize fats for absorption and is itself absorbed. It is used as cholagogue and choleretic. | bile acid; C24-steroid; monohydroxy-5beta-cholanic acid | geroprotector; human metabolite; mouse metabolite |
| chenodeoxycholic acid | chenodeoxycholate : Conjugate base of chenodeoxycholic acid; major species at pH 7.3. chenodeoxycholic acid : A dihydroxy-5beta-cholanic acid that is (5beta)-cholan-24-oic acid substituted by hydroxy groups at positions 3 and 7 respectively. Chenodeoxycholic Acid: A bile acid, usually conjugated with either glycine or taurine. It acts as a detergent to solubilize fats for intestinal absorption and is reabsorbed by the small intestine. It is used as cholagogue, a choleretic laxative, and to prevent or dissolve gallstones. | bile acid; C24-steroid; dihydroxy-5beta-cholanic acid | human metabolite; mouse metabolite |
| glycochenodeoxycholic acid | glycochenodeoxycholate : A N-acylglycinate that is the conjugate base of glycochenodeoxycholic acid. glycochenodeoxycholic acid : A bile acid glycine conjugate having 3alpha,7alpha-dihydroxy-5beta-cholan-24-oyl as the bile acid component. Glycochenodeoxycholic Acid: A bile salt formed in the liver from chenodeoxycholate and glycine, usually as the sodium salt. It acts as a detergent to solubilize fats for absorption and is itself absorbed. It is a cholagogue and choleretic. | bile acid glycine conjugate | human metabolite |
| ursodeoxycholic acid | ursodeoxycholate : A bile acid anion that is the conjugate base of ursodeoxycholic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. ursodeoxycholic acid : A bile acid found in the bile of bears (Ursidae) as a conjugate with taurine. Used therapeutically, it prevents the synthesis and absorption of cholesterol and can lead to the dissolution of gallstones. Ursodeoxycholic Acid: An epimer of chenodeoxycholic acid. It is a mammalian bile acid found first in the bear and is apparently either a precursor or a product of chenodeoxycholate. Its administration changes the composition of bile and may dissolve gallstones. It is used as a cholagogue and choleretic. | bile acid; C24-steroid; dihydroxy-5beta-cholanic acid | human metabolite; mouse metabolite |
| fulvestrant | fulvestrant : A 3-hydroxy steroid that is 17beta-estradiol in which the 7alpha hydrogen has been replaced by a nonyl group in which one of the hydrogens of the terminal methyl has been replaced by a (4,4,5,5,5-pentafluoropentyl)sulfinyl group. An estrogen receptor antagonist, it is used in the treatment of breast cancer. Fulvestrant: An estradiol derivative and estrogen receptor antagonist that is used for the treatment of estrogen receptor-positive, locally advanced or metastatic breast cancer. | 17beta-hydroxy steroid; 3-hydroxy steroid; organofluorine compound; sulfoxide | antineoplastic agent; estrogen antagonist; estrogen receptor antagonist |
| 6-hydroxydopa | 6-hydroxydopa: RN given refers to cpd without isomeric designation | non-proteinogenic alpha-amino acid | |
| ly 255283 | LY 255283: structure given in UD; leukotriene B4 antagonist | aromatic ketone | |
| nbi 27914 | dialkylarylamine; tertiary amino compound | ||
| cholic acid | cholic acid : A bile acid that is 5beta-cholan-24-oic acid bearing three alpha-hydroxy substituents at position 3, 7 and 12. Cholic Acid: A major primary bile acid produced in the liver and usually conjugated with glycine or taurine. It facilitates fat absorption and cholesterol excretion. | 12alpha-hydroxy steroid; 3alpha-hydroxy steroid; 7alpha-hydroxy steroid; bile acid; C24-steroid; trihydroxy-5beta-cholanic acid | human metabolite; mouse metabolite |
| deoxycholic acid | deoxycholic acid : A bile acid that is 5beta-cholan-24-oic acid substituted by hydroxy groups at positions 3 and 12 respectively. Deoxycholic Acid: A bile acid formed by bacterial action from cholate. It is usually conjugated with glycine or taurine. Deoxycholic acid acts as a detergent to solubilize fats for intestinal absorption, is reabsorbed itself, and is used as a choleretic and detergent. | bile acid; C24-steroid; dihydroxy-5beta-cholanic acid | human blood serum metabolite |
| taurochenodeoxycholic acid | taurochenodeoxycholate : An organosulfonate oxoanion that is the conjugate base of taurochenodeoxycholic acid arising from deprotonation of the sulfonate OH group; major species at pH 7.3. taurochenodeoxycholic acid : A bile acid taurine conjugate of chenodeoxycholic acid. Taurochenodeoxycholic Acid: A bile salt formed in the liver by conjugation of chenodeoxycholate with taurine, usually as the sodium salt. It acts as detergent to solubilize fats in the small intestine and is itself absorbed. It is used as a cholagogue and choleretic. | bile acid taurine conjugate | human metabolite; mouse metabolite |
| 5,11-diethyl-5,6,11,12-tetrahydrochrysene-2,8-diol | (R,R)-5,11-diethyl-5,6,11,12-tetrahydro-2,8-chrysenediol : A carbotetracyclic compound that is 5,6,11,12-tetrahydrochrysene substituted by hydroxy groups at positions 2 and 8 and by ethyl groups at positions 5 and 11 (the 5R,11R-stereoisomer). It is an agonist of ER-alpha and antagonist of ER-beta receptors. 5,11-diethyl-5,6,11,12-tetrahydrochrysene-2,8-diol: estrogen receptor ligand; structure in first source | carbotetracyclic compound; polyphenol | estrogen receptor agonist; estrogen receptor antagonist; geroprotector; neuroprotective agent |
| obeticholic acid | obeticholic acid : A dihydroxy-5beta-cholanic acid that is chenodeoxycholic acid carrying an additional ethyl substituent at the 6alpha-position. A semi-synthetic bile acid which acts as a farnesoid X receptor agonist and is used for treatment of primary biliary cholangitis. obeticholic acid: A farnesoid X receptor agonist and anticholestatic agent that is used in the treatment of chronic liver diseases; structure in first source. | 3alpha-hydroxy steroid; 7alpha-hydroxy steroid; dihydroxy-5beta-cholanic acid | farnesoid X receptor agonist; hepatoprotective agent |
| t0901317 | T0901317: an LXRalpha and LXRbeta agonist | ||
| 6-bromoindirubin-3'-oxime | 6-bromoindirubin-3'-oxime : A member of the class of biindoles that is indirubin substituted at position 6 by a bromo group and in which the keto group at position 3' has undergone condensation with hydroxylamine to form the corresponding oxime. 6-bromoindirubin-3'-oxime: structure in first source | ||
| gw 7647 | GW 7647 : A monocarboxylic acid that is 2-(phenylsulfanyl)isobutyric acid in which the phenyl group is substituted at the para- position by a 3-aza-7-cyclohexylhept-1-yl group in which the nitrogen is acylated by a (cyclohexylamino)carbonyl group. GW 7647: a PPAR-alpha agonist; structure in first source | aryl sulfide; monocarboxylic acid; ureas | PPARalpha agonist |
| jhw 015 | indolecarboxamide | ||
| andrographolide | carbobicyclic compound; gamma-lactone; labdane diterpenoid; primary alcohol; secondary alcohol | anti-HIV agent; anti-inflammatory drug; antineoplastic agent; metabolite | |
| fexaramine | fexaramine: structure in first source | biphenyls | |
| pregna-4,17-diene-3,16-dione | pregna-4,17-diene-3,16-dione: steroid from guggulu extract; RN & N1 from C1 Form index; RN given refers to cpd without isomeric designation; structure in first source; antagonist of farnesoid X receptor | 3-hydroxy steroid | androgen |
| pregna-4,17-diene-3,16-dione, (17z)-isomer | |||
| gw 4064 | stilbenoid | ||
| way-362450 | indoles | ||
| 12-epi-scalarin | 12-epi-scalarin : The 12-epimer of scalarin, a metabolite of marine sponges of the genus Spongia. | scalarane sesterterpenoid | animal metabolite |
| glycoursodeoxycholic acid | glycoursodeoxycholate : A N-acylglycinate that is the conjugate base of glycoursodeoxycholic acid. obtained by deprotonation of the carboxy group; major species at pH 7.3. glycoursodeoxycholic acid : A bile acid glycine conjugate derived from ursoodeoxycholic acid. | bile acid glycine conjugate; N-acylglycine | human blood serum metabolite; neuroprotective agent |
| alisol b monoacetate | alisol B 23-acetate: from Alisma orientale rhizome; structure in first source | triterpenoid | |
| alisol c 23-acetate | alisol C 23-acetate: isolated from Alismatis Rhizoma; structure in first source | ||
| alisol a | alisol A: has anti-hepatitis B virus activity; structure | ||
| alisol b | triterpenoid | ||
| archazolid a | archazolid A: inhibits vacuolar-type ATPase; isolated from Archangium gephyra; structure in first source | ||
| int-777 | |||
| alisol f | |||
| alisol a 24-acetate | alisol A 24-acetate: isolated from Alismatis Rhizoma; structure in first source | ||
| 4-(2-(2-chloro-4-((5-cyclopropyl-3-(2,6-dichlorophenyl)-4-isoxazolyl)methoxy)phenyl)cyclopropyl)benzoic acid | 4-(2-(2-chloro-4-((5-cyclopropyl-3-(2,6-dichlorophenyl)-4-isoxazolyl)methoxy)phenyl)cyclopropyl)benzoic acid: a farnesoid X receptor agonist; structure in first source |