Target type: molecularfunction
Catalysis of the reaction: S-adenosyl-L-methionine + a catechol = S-adenosyl-L-homocysteine + a guaiacol. [EC:2.1.1.6]
Catechol O-methyltransferase (COMT) activity refers to the enzymatic transfer of a methyl group from S-adenosyl methionine (SAM) to a hydroxyl group on a catechol substrate. This methylation reaction is crucial for various biological processes, including neurotransmitter metabolism, hormone biosynthesis, and detoxification.
COMT enzymes catalyze the methylation of catecholamines like dopamine, norepinephrine, and epinephrine. This methylation can alter the neurotransmitter's affinity for their receptors, impacting their signaling pathways. For instance, methylation of dopamine can modulate its activity in the brain, affecting mood, cognition, and motor control.
COMT also plays a role in the detoxification of xenobiotics by converting them into more water-soluble forms, facilitating their excretion. Additionally, it participates in hormone biosynthesis, affecting the synthesis of estrogen and other steroid hormones.
The catalytic mechanism of COMT involves the formation of a ternary complex with the catechol substrate and SAM. The enzyme then facilitates the transfer of a methyl group from SAM to the catechol, generating S-adenosyl homocysteine (SAH) and the methylated catechol product.
The activity of COMT can be influenced by various factors, including genetic variations, drug interactions, and environmental exposures. Understanding COMT activity is crucial for elucidating its role in various physiological and pathological conditions and developing targeted therapies for related disorders.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Catechol O-methyltransferase | A catechol O-methyltransferase that is encoded in the genome of human. [PRO:DNx, UniProtKB:P21964] | Homo sapiens (human) |
| Catechol O-methyltransferase | A catechol O-methyltransferase that is encoded in the genome of human. [PRO:DNx, UniProtKB:P21964] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| oxyquinoline | Oxyquinoline: An antiseptic with mild fungistatic, bacteriostatic, anthelmintic, and amebicidal action. It is also used as a reagent and metal chelator, as a carrier for radio-indium for diagnostic purposes, and its halogenated derivatives are used in addition as topical anti-infective agents and oral antiamebics. quinolin-8-ol : A monohydroxyquinoline that is quinoline substituted by a hydroxy group at position 8. Its fungicidal properties are used for the control of grey mould on vines and tomatoes. | monohydroxyquinoline | antibacterial agent; antifungal agrochemical; antiseptic drug; iron chelator |
| verapamil | 2-(3,4-dimethoxyphenyl)-5-{[2-(3,4-dimethoxyphenyl)ethyl](methyl)amino}-2-(propan-2-yl)pentanenitrile : A tertiary amino compound that is 3,4-dimethoxyphenylethylamine in which the hydrogens attached to the nitrogen are replaced by a methyl group and a 4-cyano-4-(3,4-dimethoxyphenyl)-5-methylhexyl group. verapamil : A racemate comprising equimolar amounts of dexverapamil and (S)-verapamil. An L-type calcium channel blocker of the phenylalkylamine class, it is used (particularly as the hydrochloride salt) in the treatment of hypertension, angina pectoris and cardiac arrhythmia, and as a preventive medication for migraine. Verapamil: A calcium channel blocker that is a class IV anti-arrhythmia agent. | aromatic ether; nitrile; polyether; tertiary amino compound | |
| 8-hydroxyquinoline-5-sulfonic acid | 8-hydroxyquinoline-5-sulfonic acid: RN given refers to parent cpd | ||
| 5'-methylthioadenosine | 5'-methylthioadenosine: structure 5'-S-methyl-5'-thioadenosine : Adenosine with the hydroxy group at C-5' substituted with a methylthio (methylsulfanyl) group. | thioadenosine | algal metabolite; Escherichia coli metabolite; human metabolite; mouse metabolite; Saccharomyces cerevisiae metabolite |
| sitagliptin | sitagliptin : A triazolopyrazine that exhibits hypoglycemic activity. | triazolopyrazine; trifluorobenzene | EC 3.4.14.5 (dipeptidyl-peptidase IV) inhibitor; environmental contaminant; hypoglycemic agent; serine proteinase inhibitor; xenobiotic |
| tolcapone | tolcapone : Benzophenone substituted on one of the phenyl rings at C-3 and C-4 by hydroxy groups and at C-5 by a nitro group, and on the other phenyl ring by a methyl group at C-4. It is an inhibitor of catechol O-methyltransferase. Tolcapone: A benzophenone and nitrophenol compound that acts as an inhibitor of CATECHOL O-METHYLTRANSFERASE, an enzyme involved in the metabolism of DOPAMINE and LEVODOPA. It is used in the treatment of PARKINSON DISEASE in patients for whom levodopa is ineffective or contraindicated. | 2-nitrophenols; benzophenones; catechols | antiparkinson drug; EC 2.1.1.6 (catechol O-methyltransferase) inhibitor |
| entacapone | entacapone : A monocarboxylic acid amide that is N,N-diethylprop-2-enamide in which the hydrogen at position 2 is substituted by a cyano group and the hydrogen at the 3E position is substituted by a 3,4-dihydroxy-5-nitrophenyl group. entacapone: structure given in first source | 2-nitrophenols; catechols; monocarboxylic acid amide; nitrile | antidyskinesia agent; antiparkinson drug; central nervous system drug; EC 2.1.1.6 (catechol O-methyltransferase) inhibitor |
| opicapone | opicapone: structure in first source | oxadiazole; ring assembly |