Gene Targets > dopachrome isomerase activity
Page last updated: 2024-10-24

dopachrome isomerase activity

Definition

Target type: molecularfunction

Catalysis of the reaction: L-dopachrome = 5,6-dihydroxyindole-2-carboxylate. [EC:5.3.3.12, RHEA:13041]

Dopachrome isomerase activity refers to the enzymatic catalysis of the conversion of dopachrome to 5,6-dihydroxyindole-2-carboxylic acid (DHICA). This reaction is crucial in the melanin biosynthesis pathway. Dopachrome, a highly reactive intermediate, is formed from the oxidation of L-dopaquinone. If left unchecked, dopachrome can lead to the formation of cytotoxic and genotoxic byproducts. Dopachrome isomerase, also known as DHICA synthetase, plays a vital role in preventing these harmful effects by efficiently converting dopachrome to DHICA.

DHICA is a more stable and less reactive molecule, and its formation contributes to the production of eumelanin, the brown-black pigment found in human skin, hair, and eyes. The catalytic mechanism of dopachrome isomerase involves a complex series of steps that involve protonation, deprotonation, and rearrangement of the dopachrome molecule. The enzyme utilizes its active site residues, including a conserved histidine and a tyrosine, to facilitate these reactions. Dopachrome isomerase activity is essential for maintaining normal melanin pigmentation and preventing the accumulation of potentially harmful reactive intermediates in the melanogenic pathway.'
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Proteins (1)

ProteinDefinitionTaxonomy
Macrophage migration inhibitory factorA macrophage migration inhibitory factor that is encoded in the genome of human. [PRO:DNx, UniProtKB:P14174]Homo sapiens (human)

Compounds (35)

CompoundDefinitionClassesRoles
histaminearalkylamino compound;
imidazoles		human metabolite;
mouse metabolite;
neurotransmitter
thyroxine2-halophenol;
amino acid zwitterion;
iodophenol;
iodothyronine;
non-proteinogenic alpha-amino acid;
tyrosine derivative		mitogen
4-hydroxyphenylpyruvic acid4-hydroxyphenylpyruvic acid : A 2-oxo monocarboxylic acid that is pyruvic acid in which one of the methyl hydrogens is substituted by a 4-hydroxyphenyl group.

4-hydroxyphenylpyruvic acid: RN given refers to parent cpd		2-oxo monocarboxylic acid;
phenols		human metabolite
porphobilinogenaralkylamino compound;
dicarboxylic acid;
pyrroles		Escherichia coli metabolite;
metabolite;
mouse metabolite
benzyl isothiocyanatebenzyl isothiocyanate: inhibits carcinogen-induced neoplasia; structure in Negwer, 5th ed, #715; also promotes urinary bladder carcinomabenzenes;
isothiocyanate		antibacterial drug
ebselenebselen : A benzoselenazole that is 1,2-benzoselenazol-3-one carrying an additional phenyl substituent at position 2. Acts as a mimic of glutathione peroxidase.benzoselenazoleanti-inflammatory drug;
antibacterial agent;
anticoronaviral agent;
antifungal agent;
antineoplastic agent;
antioxidant;
apoptosis inducer;
EC 1.13.11.33 (arachidonate 15-lipoxygenase) inhibitor;
EC 1.13.11.34 (arachidonate 5-lipoxygenase) inhibitor;
EC 1.3.1.8 [acyl-CoA dehydrogenase (NADP(+))] inhibitor;
EC 1.8.1.12 (trypanothione-disulfide reductase) inhibitor;
EC 2.5.1.7 (UDP-N-acetylglucosamine 1-carboxyvinyltransferase) inhibitor;
EC 2.7.10.1 (receptor protein-tyrosine kinase) inhibitor;
EC 3.1.3.25 (inositol-phosphate phosphatase) inhibitor;
EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor;
EC 3.5.4.1 (cytosine deaminase) inhibitor;
EC 5.1.3.2 (UDP-glucose 4-epimerase) inhibitor;
enzyme mimic;
ferroptosis inhibitor;
genotoxin;
hepatoprotective agent;
neuroprotective agent;
radical scavenger
hexachlorophenehexachlorophene : An organochlorine compound that is diphenylmethane in which each of the phenyl groups is substituted by chlorines at positions 2, 3, and 5, and by a hydroxy group at position 6. An antiseptic that is effective against Gram-positive organisms, it is used in soaps and creams for the treatment of various skin disorders. It is also used in agriculture as an acaricide and fungicide, but is not approved for such use within the European Union.

Hexachlorophene: A chlorinated bisphenol antiseptic with a bacteriostatic action against Gram-positive organisms, but much less effective against Gram-negative organisms. It is mainly used in soaps and creams and is an ingredient of various preparations used for skin disorders. (From Martindale, The Extra Pharmacopoeia, 30th ed, p797)		bridged diphenyl fungicide;
polyphenol;
trichlorobenzene		acaricide;
antibacterial agent;
antifungal agrochemical;
antiseptic drug
ibudilastpyrazolopyridine
ipriflavoneipriflavone : A member of the class of isoflavones that is isoflavone in which the hydrogen at position 7 is replaced by an isopropoxy group. A synthetic isoflavone, it was formerly used for the treatment of osteoporosis, although a randomised controlled study failed to show any benefit. It is still used to prevent osteoporosis in post-menopausal women.aromatic ether;
isoflavones		bone density conservation agent
isoniazidHydra: A genus of freshwater polyps in the family Hydridae, order Hydroida, class HYDROZOA. They are of special interest because of their complex organization and because their adult organization corresponds roughly to the gastrula of higher animals.

hydrazide : Compounds derived from oxoacids RkE(=O)l(OH)m (l =/= 0) by replacing -OH by -NRNR2 (R groups are commonly H). (IUPAC).		carbohydrazideantitubercular agent;
drug allergen
sulforaphanesulforaphane : An isothiocyanate having a 4-(methylsulfinyl)butyl group attached to the nitrogen.

sulforaphane: from Cardaria draba L.		isothiocyanate;
sulfoxide		antineoplastic agent;
antioxidant;
EC 3.5.1.98 (histone deacetylase) inhibitor;
plant metabolite
metaraminolmetaraminol : A member of the class of phenylethanolamines that is 2-amino-1-phenylethanol substituted by a methyl group at position 2 and a phenolic hydroxy group at position 1. A sympathomimetic agent , it is used in the treatment of hypotension.

Metaraminol: A sympathomimetic agent that acts predominantly at alpha-1 adrenergic receptors. It has been used primarily as a vasoconstrictor in the treatment of HYPOTENSION.		phenylethanolaminesalpha-adrenergic agonist;
sympathomimetic agent;
vasoconstrictor agent
allyl isothiocyanateallyl isothiocyanate : An isothiocyanate with the formula CH2=CHCH2N=C=S. A colorless oil with boiling point 152degreeC, it is responsible for the pungent taste of mustard, horseradish, and wasabi.

allyl isothiocyanate: used in the manufacture of flavors, war gases; medical use as a counterirritant; structure		alkenyl isothiocyanate;
isothiocyanate		antimicrobial agent;
antineoplastic agent;
apoptosis inducer;
lachrymator;
metabolite
phenylisothiocyanatephenyl isothiocyanate : An isothiocyanate having a phenyl group attached to the nitrogen; used for amino acid sequencing in the Edman degradation.

phenylisothiocyanate: structure		isothiocyanateallergen;
reagent
phenethyl isothiocyanatephenethyl isothiocyanate : An isothiocyanate having a phenethyl group attached to the nitrogen. It is a naturally occurring compound found in some cruciferous vegetables (e.g. watercress) and is known to possess anticancer properties.

phenethyl isothiocyanate: a dietary liver aldehyde dehydrogenase inhibitor; promotes urinary bladder carcinoma		isothiocyanateantineoplastic agent;
EC 1.2.1.3 [aldehyde dehydrogenase (NAD(+))] inhibitor;
metabolite
pontamine sky blue
benzyl thiocyanatebenzyl thiocyanate: increases activities of anhydrotetracycline oxygenasethiocyanates
n-acetyl-4-benzoquinoneimineN-acetyl-4-benzoquinoneimine: reactive arylating intermediate from acetaminophen & N-hydroxyacetaminophen; structure given in first sourceketoimine;
quinone imine
3-phenylpropyl isothiocyanate3-phenylpropyl isothiocyanate: structure given in first sourcebenzenes
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
nimbinnimbin : A limonoid found in Azadirachta indica.

nimbin: from Neem seed (Azadirachta indica)		acetate ester;
cyclic terpene ketone;
enone;
furans;
limonoid;
methyl ester;
tetracyclic triterpenoid		pesticide;
plant metabolite
6-phenylhexyl isothiocyanate
iguratimodiguratimod: an immunosuppressive agentorganic molecular entity
4-phenylbutyl isothiocyanate4-phenylbutyl isothiocyanate: structure given in first source; inhibits tumorigenesis induced by 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanonebenzenes;
organic amino compound
phenylethyl isocyanate2-phenylethyl isocyanate : An isocyanate having a 2-phenylethyl group attached to the nitrogen.isocyanateshapten
4-iodo-6-phenylpyrimidine4-iodo-6-phenylpyrimidine : A member of the class of pyrimidines carrying iodo and phenyl substituents at positions 4 and 6 respectively.

4-iodo-6-phenylpyrimidine: acts on macrophage migration inhibitory factor; structure in first source		biaryl;
organoiodine compound;
pyrimidines		antineoplastic agent;
apoptosis inducer;
macrophage migration inhibitory factor inhibitor
esculetinesculetin : A hydroxycoumarin that is umbelliferone in which the hydrogen at position 6 is substituted by a hydroxy group. It is used in filters for absorption of ultraviolet light.

esculetin: used in filters for absorption of ultraviolet light; structure		hydroxycoumarinantioxidant;
plant metabolite;
ultraviolet filter
esculinbeta-D-glucoside;
hydroxycoumarin		antioxidant;
metabolite
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
3',4',7-trihydroxyisoflavone3',4',7-trihydroxyisoflavone : A 7-hydroxyisoflavone that is daidzein substituted by a hydroxy group at position 3'.

3',4',7-trihydroxyisoflavone: from Streptomyces sp OH-1049; structure given in first source		7-hydroxyisoflavonesantineoplastic agent;
EC 1.3.1.22 [3-oxo-5alpha-steroid 4-dehydrogenase (NADP(+))] inhibitor;
metabolite
3-cyano-7-hydroxycoumarin3-cyano-7-hydroxycoumarin: structure given in first source
salanninsalannin : A limonoid with insecticidal activity isolated from Azadirachta indica.

salannin: from seeds of neem tree, Azadirachta indica; inhibits 20-monooxygenase; structure given in first source		acetate ester;
furans;
limonoid;
methyl ester;
organic heteropentacyclic compound		antifeedant;
insect growth regulator;
plant metabolite
2-pyridin-2-yl-4h-1,3-benzothiazin-4-one2-pyridin-2-yl-4H-1,3-benzothiazin-4-one: a cardioprotective agent; structure in first source
azadiradioneazadiradione : A tetracyclic triterpenoid that is 4,4,8-trimethylandrosta-1,14-diene substituted by oxo groups at positions 3 and 16, an acetoxy group at position 7 and a furan-3-yl group at position 17. Isolated from Azadirachta indica, it exhibits antimycobacterial and anti-inflammatory activities.

azadiradione: structure in first source		acetate ester;
cyclic terpene ketone;
furans;
limonoid;
tetracyclic triterpenoid		anti-inflammatory agent;
antimycobacterial drug;
plant metabolite
epoxyazadiradioneepoxyazadiradione : A limonoid that is azadiradione with an epoxy group across positions 14 and 15. Isolated from Azadirachta indica it exhibits insecticidal activitry against mosquitoes.

epoxyazadiradione: limonoid from neem tree Azadirachta indica; RN given for (5alpha,7alpha,13alpha,14beta,15beta,17alpha)-isomer; structure in first source		acetate ester;
cyclic terpene ketone;
epoxide;
furans;
limonoid;
pentacyclic triterpenoid		anti-inflammatory agent;
insecticide;
plant metabolite
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