catechol

catechol
1. SYN: pyrocatechol. 2. Term loosely used for catechin, which contains an o-c. moiety, and as the root of catecholamines, which are pyrocatechol derivatives.
- c.-O-methyltransferase a transferase that catalyzes the methylation of the hydroxyl group at the 3 position of the aromatic ring of catechols, including the catecholamines norepinephrine and epinephrine (thus, converting to normetanephrine and metanephrine, respectively), the methyl group coming from S-adenosyl-l-methionine. An important step in the catabolism of the catecholamines.
- c. oxidase an enzyme oxidizing catechols to 1,2-benzoquinones, with O2. SEE ALSO: monophenol monooxygenase. SYN: diphenol oxidase, o-diphenolase.
- c. oxidase (dimerizing) an enzyme oxidizing a c., with O2, to a diphenylenedioxide quinone ( e.g., 4 c. + 3O2 → 2 dibenzo[1,4]-2,3-dione + 6H2O).

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cat·e·chol 'kat-ə-.kȯl, -.kōl n
1) CATECHIN
2) PYROCATECHOL

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cat·e·chol (katґə-kol) 1. catechin. 2. pyrocatechol.

Medical dictionary. 2011.

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