Page last updated: 2024-10-24

nitric oxide storage

Definition

Target type: biologicalprocess

The accumulation and maintenance in cells or tissues of nitric oxide (NO). Nitric oxide is stored in the form of dinitrosyl-iron complexes, which are stabilized, and possibly sequestered, by binding to glutathione S-transferase proteins. [GOC:BHF, PMID:12871945]

Nitric oxide (NO) is a highly reactive and short-lived molecule that cannot be directly stored within cells. Instead, its biological effects are mediated through its rapid generation and diffusion to target cells. NO is primarily produced from the amino acid L-arginine by the enzyme nitric oxide synthase (NOS). There are three main isoforms of NOS: neuronal NOS (nNOS), endothelial NOS (eNOS), and inducible NOS (iNOS). Each isoform is regulated differently and plays a distinct role in various physiological processes.

While NO cannot be stored in its free form, there are several mechanisms by which its effects can be regulated and sustained:

1. **Regulation of NOS activity:** The activity of NOS enzymes can be regulated by various factors, including calcium influx, phosphorylation, and interactions with other proteins. This allows for rapid and localized NO production in response to specific stimuli.

2. **Formation of S-nitrosothiols (RSNOs):** NO can react with thiols, such as cysteine residues in proteins, to form S-nitrosothiols. RSNOs are considered a reservoir of NO and can release NO upon specific stimuli, prolonging its biological effects.

3. **Nitrosylation of iron-sulfur clusters:** NO can bind to iron-sulfur clusters in proteins, affecting their activity. This mechanism can act as a storage mechanism for NO and influence the function of various enzymes and signaling pathways.

4. **Formation of nitrotyrosine:** NO can react with tyrosine residues in proteins to form nitrotyrosine. This modification can alter protein function and is often associated with oxidative stress and inflammation.

In summary, NO is not stored in a specific compartment or as a stable molecule. Instead, its effects are regulated by the dynamic production and signaling mechanisms that involve the regulation of NOS activity, formation of NO-containing species like RSNOs, and the nitrosylation of target proteins. These mechanisms ensure the rapid and localized delivery of NO to its target cells and contribute to its diverse physiological roles.'
"

Proteins (1)

ProteinDefinitionTaxonomy
Glutathione S-transferase PA glutathione S-transferase P that is encoded in the genome of human. [PRO:DNx, UniProtKB:P09211]Homo sapiens (human)

Compounds (10)

CompoundDefinitionClassesRoles
ethacrynic acidetacrynic 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
d-alpha tocopherol(R,R,R)-alpha-tocopherol : An alpha-tocopherol that has R,R,R configuration. The naturally occurring stereoisomer of alpha-tocopherol, it is found particularly in sunflower and olive oils.

tocopherol : A collective name for a group of closely related lipids that contain a chroman-6-ol nucleus substituted at position 2 by a methyl group and by a saturated hydrocarbon chain consisting of three isoprenoid units. They are designated as alpha-, beta-, gamma-, and delta-tocopherol depending on the number and position of additional methyl substituents on the aromatic ring. Tocopherols occur in vegetable oils and vegetable oil products, almost exclusively with R,R,R configuration. Tocotrienols differ from tocopherols only in having three double bonds in the hydrocarbon chain.

vitamin E : Any member of a group of fat-soluble chromanols that exhibit biological activity against vitamin E deficiency. The vitamers in this class consists of a chroman-6-ol core which is substituted at position 2 by a methyl group and (also at position 2) either a saturated or a triply-unsaturated hydrocarbon chain consisting of three isoprenoid units. The major function of vitamin E is to act as a natural antioxidant by scavenging free radicals and molecular oxygen.

Vitamin E: A generic descriptor for all TOCOPHEROLS and TOCOTRIENOLS that exhibit ALPHA-TOCOPHEROL activity. By virtue of the phenolic hydrogen on the 2H-1-benzopyran-6-ol nucleus, these compounds exhibit varying degree of antioxidant activity, depending on the site and number of methyl groups and the type of ISOPRENOIDS.
alpha-tocopherolalgal metabolite;
antiatherogenic agent;
anticoagulant;
antioxidant;
antiviral agent;
EC 2.7.11.13 (protein kinase C) inhibitor;
immunomodulator;
micronutrient;
nutraceutical;
plant metabolite
hexylglutathioneS-hexylglutathione : An S-substituted glutathione that is glutathione in which the hydrogen of the thiol has been replaced by a hexyl group (PDB entry: 1PN9).S-substituted glutathione
5-chloromethylfluorescein diacetateacetate esterfluorochrome
malagashaninemalagashanine: from Strychnos sp.; structure given in first source
curcumincurcumin : A beta-diketone that is methane in which two of the hydrogens are substituted by feruloyl groups. A natural dyestuff found in the root of Curcuma longa.

Curcumin: A yellow-orange dye obtained from tumeric, the powdered root of CURCUMA longa. It is used in the preparation of curcuma paper and the detection of boron. Curcumin appears to possess a spectrum of pharmacological properties, due primarily to its inhibitory effects on metabolic enzymes.
aromatic ether;
beta-diketone;
diarylheptanoid;
enone;
polyphenol
anti-inflammatory agent;
antifungal agent;
antineoplastic agent;
biological pigment;
contraceptive drug;
dye;
EC 1.1.1.205 (IMP dehydrogenase) inhibitor;
EC 1.1.1.21 (aldehyde reductase) inhibitor;
EC 1.1.1.25 (shikimate dehydrogenase) inhibitor;
EC 1.6.5.2 [NAD(P)H dehydrogenase (quinone)] inhibitor;
EC 1.8.1.9 (thioredoxin reductase) inhibitor;
EC 2.7.10.2 (non-specific protein-tyrosine kinase) inhibitor;
EC 3.5.1.98 (histone deacetylase) inhibitor;
flavouring agent;
food colouring;
geroprotector;
hepatoprotective agent;
immunomodulator;
iron chelator;
ligand;
lipoxygenase inhibitor;
metabolite;
neuroprotective agent;
nutraceutical;
radical scavenger
ellagic acidcatechols;
cyclic ketone;
lactone;
organic heterotetracyclic compound;
polyphenol
antioxidant;
EC 1.14.18.1 (tyrosinase) inhibitor;
EC 2.3.1.5 (arylamine N-acetyltransferase) inhibitor;
EC 2.4.1.1 (glycogen phosphorylase) inhibitor;
EC 2.5.1.18 (glutathione transferase) inhibitor;
EC 2.7.1.127 (inositol-trisphosphate 3-kinase) inhibitor;
EC 2.7.1.151 (inositol-polyphosphate multikinase) inhibitor;
EC 2.7.4.6 (nucleoside-diphosphate kinase) inhibitor;
EC 2.7.7.7 (DNA-directed DNA polymerase) inhibitor;
EC 5.99.1.2 (DNA topoisomerase) inhibitor;
EC 5.99.1.3 [DNA topoisomerase (ATP-hydrolysing)] inhibitor;
food additive;
fungal metabolite;
geroprotector;
plant metabolite;
skin lightening agent
2-crotonyloxymethyl-2-cyclohexenone2-crotonyloxymethyl-2-cyclohexenone: structure given in first source
6-(7-nitro-2,1,3-benzoxadiazol-4-ylthio)hexanol6-(7-nitro-2,1,3-benzoxadiazol-4-ylthio)hexanol: a specific glutathione S-transferase inhibitor; structure in first source
flavellagic acidflavellagic acid: RN given refers to parent cpd; structure