Target type: molecularfunction
Catalysis of the transfer of a nitric oxide (NO) group to a sulphur atom within a cysteine residue of a protein. [GOC:sp, PMID:20972425, PMID:20972426]
Peptidyl-cysteine S-nitrosylase activity is a molecular function that involves the enzymatic transfer of a nitric oxide (NO) group to a cysteine residue within a polypeptide chain, leading to the formation of an S-nitrosothiol (SNO). This modification, known as S-nitrosylation, plays a critical role in regulating various cellular processes, including signal transduction, gene expression, protein stability, and enzyme activity.
S-nitrosylation is a reversible post-translational modification that can modulate protein function by altering its conformation, interactions with other molecules, or catalytic activity. The process is typically catalyzed by a family of enzymes known as S-nitrosoglutathione reductases (GSNORs) or S-nitrosoglutathione reductases (GSNORs), which can either introduce or remove an NO group from a cysteine residue.
The precise mechanism of S-nitrosylation catalyzed by peptidyl-cysteine S-nitrosylase activity is still under investigation, but several proposed models exist. One model suggests that the enzyme utilizes a reactive nitrogen species (RNS) such as NO or peroxynitrite (ONOO-) as a donor molecule. The RNS then interacts with a cysteine residue on the target protein, forming an SNO group. Alternatively, some studies suggest that the enzyme may utilize a pre-existing SNO group on a donor molecule as the source of NO for the S-nitrosylation reaction.
The biological significance of peptidyl-cysteine S-nitrosylase activity is highlighted by its involvement in diverse cellular pathways, including:
* **Signal transduction:** S-nitrosylation can act as a signaling mechanism, altering protein-protein interactions and downstream signaling cascades.
* **Gene expression:** S-nitrosylation can regulate gene transcription by modifying transcription factors or other proteins involved in gene regulation.
* **Protein stability:** S-nitrosylation can influence protein folding and stability, affecting protein turnover and cellular function.
* **Enzyme activity:** S-nitrosylation can modulate the activity of various enzymes by altering their catalytic properties or substrate binding.
Understanding the molecular function of peptidyl-cysteine S-nitrosylase activity is essential for elucidating the complex roles of NO signaling in health and disease. Dysregulation of this activity has been implicated in a variety of pathological conditions, including cardiovascular disease, neurodegenerative disorders, and cancer. Further research into the mechanisms and consequences of peptidyl-cysteine S-nitrosylation is crucial for developing novel therapeutic strategies targeting this important regulatory pathway.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Flavin reductase (NADPH) | A flavin reductase that is encoded in the genome of human. [PRO:DNx, UniProtKB:P30043] | Homo sapiens (human) |
| Glyceraldehyde-3-phosphate dehydrogenase | A glyceraldehyde-3-phosphate dehydrogenase that is encoded in the genome of human. [PRO:DNx, UniProtKB:P04406] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| coumarin | 2H-chromen-2-one: coumarin derivative | coumarins | fluorescent dye; human metabolite; plant metabolite |
| erythrosine | Fluoresceins: A family of spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one derivatives. These are used as dyes, as indicators for various metals, and as fluorescent labels in immunoassays. | ||
| oxidopamine | oxidopamine : A benzenetriol that is phenethylamine in which the hydrogens at positions 2, 4, and 5 on the phenyl ring are replaced by hydroxy groups. It occurs naturally in human urine, but is also produced as a metabolite of the drug DOPA (used for the treatment of Parkinson's disease). Oxidopamine: A neurotransmitter analogue that depletes noradrenergic stores in nerve endings and induces a reduction of dopamine levels in the brain. Its mechanism of action is related to the production of cytolytic free-radicals. | benzenetriol; catecholamine; primary amino compound | drug metabolite; human metabolite; neurotoxin |
| pentamidine | pentamidine : A diether consisting of pentane-1,5-diol in which both hydroxyl hydrogens have been replaced by 4-amidinophenyl groups. A trypanocidal drug that is used for treatment of cutaneous leishmaniasis and Chagas disease. Pentamidine: Antiprotozoal agent effective in trypanosomiasis, leishmaniasis, and some fungal infections; used in treatment of PNEUMOCYSTIS pneumonia in HIV-infected patients. It may cause diabetes mellitus, central nervous system damage, and other toxic effects. | aromatic ether; carboxamidine; diether | anti-inflammatory agent; antifungal agent; calmodulin antagonist; chemokine receptor 5 antagonist; EC 2.3.1.48 (histone acetyltransferase) inhibitor; NMDA receptor antagonist; S100 calcium-binding protein B inhibitor; trypanocidal drug; xenobiotic |
| sulfasalazine | sulfasalazine : An azobenzene consisting of diphenyldiazene having a carboxy substituent at the 4-position, a hydroxy substituent at the 3-position and a 2-pyridylaminosulphonyl substituent at the 4'-position. Sulfasalazine: A drug that is used in the management of inflammatory bowel diseases. Its activity is generally considered to lie in its metabolic breakdown product, 5-aminosalicylic acid (see MESALAMINE) released in the colon. (From Martindale, The Extra Pharmacopoeia, 30th ed, p907) | ||
| osthol | osthol: from Cnidium monnieri and Angelica pubescens (both Apiaceae); structure given in first source | botanical anti-fungal agent; coumarins | metabolite |
| nicotinamide mononucleotide | Nicotinamide Mononucleotide: 3-Carbamoyl-1-beta-D-ribofuranosyl pyridinium hydroxide-5'phosphate, inner salt. A nucleotide in which the nitrogenous base, nicotinamide, is in beta-N-glycosidic linkage with the C-1 position of D-ribose. Synonyms: Nicotinamide Ribonucleotide; NMN. | nicotinamide mononucleotide | Escherichia coli metabolite; mouse metabolite |
| 2-methyladenine | methyladenine : Any member of the class of 6-aminopurines that is adenine bearing a single methyl substituent. | ||
| olsalazine | olsalazine : An azobenzene that consists of two molecules of 4-aminosalicylic acid joined by an azo linkage. A prodrug for mesalazine, an anti-inflammatory drug, it is used (as the disodium salt) in the treatment of inflammatory bowel disease. olsalazine: cpd with 2 salicylate molecules linked together by an azo bond | azobenzenes; dicarboxylic acid | non-steroidal anti-inflammatory drug; prodrug |
| isopentenyladenosine | Isopentenyladenosine: N(6)-[delta(3)-isopentenyl]adenosine. Isopentenyl derivative of adenosine which is a member of the cytokinin family of plant growth regulators. N(6)-(Delta(2)-isopentenyl)adenosine : A nucleoside analogue in which adenosine has been modified by substitution at the 6-amino nitrogen by a Delta(2)-isopentenyl group. | N-ribosyl-N(6)-isopentenyladenine; nucleoside analogue | antineoplastic agent; plant growth regulator; plant metabolite |
| benzonidazole | benznidazole : A monocarboxylic acid amide obtained by formal condensation of the carboxy group of (2-nitroimidazol-1-yl)acetic acid with the aromatic amino group of benzylamine. Used for treatment of Chagas disease. benzonidazole: used in treatment of Chagas' disease | C-nitro compound; imidazoles; monocarboxylic acid amide | antiprotozoal drug |
| adenosine | quinquefolan B: isolated from roots of Panax quinquefolium L.; RN not in Chemline 10/87; RN from Toxlit | adenosines; purines D-ribonucleoside | analgesic; anti-arrhythmia drug; fundamental metabolite; human metabolite; vasodilator agent |
| xanthyletine | xanthyletine: structure | coumarins | |
| metrifudil | |||
| seselin | seselin: structure in first source | coumarins | metabolite |
| n(6)-benzyladenosine | N(6)-benzyladenosine: RN given refers to parent cpd | ||
| tamibarotene | tamibarotene : A dicarboxylic acid monoamide resulting from the condensation of one of the carboxy groups of terephthalic acid with the amino group of 5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalen-2-amine. tamibarotene: has retinoid-binding activity | dicarboxylic acid monoamide; retinoid; tetralins | antineoplastic agent; retinoic acid receptor alpha/beta agonist |
| febuxostat | febuxostat : A 1,3-thiazolemonocarboxylic acid that is 4-methyl-1,3-thiazole-5-carboxylic acid which is substituted by a 3-cyano-4-(2-methylpropoxy)phenyl group at position 2. It is an orally-active, potent, and selective xanthine oxidase inhibitor used for the treatment of chronic hyperuricaemia in patients with gout. Febuxostat: A thiazole derivative and inhibitor of XANTHINE OXIDASE that is used for the treatment of HYPERURICEMIA in patients with chronic GOUT. | 1,3-thiazolemonocarboxylic acid; aromatic ether; nitrile | EC 1.17.3.2 (xanthine oxidase) inhibitor |
| deferasirox | deferasirox : A member of the class of triazoles, deferasirox is 1,2,4-triazole substituted by a 4-carboxyphenyl group at position 1 and by 2-hydroxyphenyl groups at positions 3 and 5. An orally active iron chelator, it is used to manage chronic iron overload in patients receiving long-term blood transfusions. Deferasirox: A triazole and benzoate derivative that acts as a selective iron chelator. It is used in the management of chronic IRON OVERLOAD due to blood transfusion or non-transfusion dependent THALASSEMIA. | benzoic acids; monocarboxylic acid; phenols; triazoles | iron chelator |
| 2-methyladenosine | 2-methyladenosine : A methyladenosine in which the methyl group is located at position 2 on the adenine ring. | methyladenosine | |
| n(6)-cyclopentyladenosine | |||
| l 783281 | L 783281: structure in first source | ||
| scopoletin | hydroxycoumarin | plant growth regulator; plant metabolite | |
| 7-hydroxycoumarin | 7-oxycoumarin: derivatives have anti-oxidant properties umbelliferone : A hydroxycoumarin that is coumarin substituted by a hydroxy group ay position 7. | hydroxycoumarin | fluorescent probe; food component; plant metabolite |
| ptc 124 | oxadiazole; ring assembly |