Target type: molecularfunction
Binding to a dinitrosyl-iron complex. Nitric oxide (NO) is stored as dinitrosyl-iron complexes, which form spontaneously from Glutathione (GSH), S-nitrosoglutathione, and trace amounts of ferrous ions, or by reaction of iron-sulfur centers with NO. [GOC:BHF, PMID:10534443]
Dinitrosyl-iron complexes (DNICs) are a class of metalloproteins that play a crucial role in cellular signaling and redox homeostasis. Their molecular function centers around the coordination of two nitric oxide (NO) molecules to a ferrous iron ion (Fe2+), forming a complex with a characteristic dinitrosyl-iron unit. This unit exhibits a unique electronic structure and reactivity, which are critical for the various biological activities associated with DNICs.
The binding of NO to iron in DNICs is facilitated by the presence of a thiolate ligand, typically from cysteine residues in proteins. The resulting complex is characterized by a linear Fe-N-O arrangement, with the NO molecules occupying axial positions relative to the iron center. This arrangement imparts distinct spectroscopic properties to DNICs, which are commonly used for their detection and characterization.
One of the key molecular functions of DNICs is their ability to act as NO donors. The labile nature of the NO molecules in the complex allows for their release and transfer to other target molecules, such as proteins or enzymes. This NO delivery mechanism is essential for various cellular processes, including vasodilation, neurotransmission, and immune regulation.
Furthermore, DNICs possess redox activity, enabling them to participate in electron transfer reactions. The iron center in DNICs can undergo oxidation and reduction, facilitating the transfer of electrons between different molecules. This redox activity is crucial for maintaining cellular redox balance and protecting against oxidative stress.
In addition to their roles in NO delivery and redox regulation, DNICs are also involved in the modulation of enzyme activity. By interacting with specific proteins, DNICs can alter their enzymatic function. This modulation can range from activation to inhibition, depending on the specific enzyme and the nature of the DNIC interaction.
Overall, the molecular function of DNICs is multifaceted and essential for maintaining cellular homeostasis. Their ability to bind NO, donate NO, participate in redox reactions, and modulate enzyme activity underscores their crucial role in various physiological processes, including signal transduction, vascular homeostasis, and immune response.'
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Protein | Definition | Taxonomy |
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Glutathione S-transferase P | A glutathione S-transferase P that is encoded in the genome of human. [PRO:DNx, UniProtKB:P09211] | Homo sapiens (human) |
Compound | Definition | Classes | Roles |
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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 |
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-tocopherol | algal metabolite; antiatherogenic agent; anticoagulant; antioxidant; antiviral agent; EC 2.7.11.13 (protein kinase C) inhibitor; immunomodulator; micronutrient; nutraceutical; plant metabolite |
hexylglutathione | S-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 diacetate | acetate ester | fluorochrome | |
malagashanine | malagashanine: from Strychnos sp.; structure given in first source | ||
curcumin | curcumin : 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 acid | catechols; 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-cyclohexenone | 2-crotonyloxymethyl-2-cyclohexenone: structure given in first source | ||
6-(7-nitro-2,1,3-benzoxadiazol-4-ylthio)hexanol | 6-(7-nitro-2,1,3-benzoxadiazol-4-ylthio)hexanol: a specific glutathione S-transferase inhibitor; structure in first source | ||
flavellagic acid | flavellagic acid: RN given refers to parent cpd; structure |