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Catechol is produced by a reversible two-electron, two-proton reduction of 1,2-benzoquinone (E 0 = +795 mV vs SHE; E m (at pH 7) = +380 mV vs SHE). [ 13 ] The redox series catecholate dianion, monoanionic semiquinonate, and benzoquinone are collectively called dioxolenes .
The 5 substrates of this enzyme are anthranilate, NADH, NADPH, H +, and O 2, whereas its 5 products are catechol, CO 2, NAD +, NADP +, and NH 3. This enzyme belongs to the family of oxidoreductases , specifically those acting on paired donors, with O2 as oxidant and incorporation or reduction of oxygen.
Catechol dioxygenases are metalloprotein enzymes that carry out the oxidative cleavage of catechols.This class of enzymes incorporate dioxygen into the substrate.Catechol dioxygenases belong to the class of oxidoreductases and have several different substrate specificities, including catechol 1,2-dioxygenase (EC 1.13.11.1), catechol 2,3-dioxygenase (EC 1.13.11.2), and protocatechuate 3,4 ...
There are three structural isomers: 1,2-dihydroxybenzene (the ortho isomer) is commonly known as catechol, 1,3-dihydroxybenzene (the meta isomer) is commonly known as resorcinol, and 1,4-dihydroxybenzene (the para isomer) is commonly known as hydroquinone. [1]
Figure 1. The overall reaction of catechol 1,2-dioxygenase. Using a non-heme iron(III) complex, 1,2-CTD is able to oxidatively cleave catechol into cis,cis-muconic acid. More specifically, 1,2-CTD is an intradiol dioxygenase, a family of catechol dioxygenases that cleaves the bond between the phenolic hydroxyl groups of catechol using an Fe 3 ...
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Catechol. A catecholamine (/ ˌ k æ t ə ˈ k oʊ l ə m iː n /; abbreviated CA) is a monoamine neurotransmitter, an organic compound that has a catechol (benzene with two hydroxyl side groups next to each other) and a side-chain amine. [1] Catechol can be either a free molecule or a substituent of a larger molecule, where it represents a 1,2 ...