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An enzyme found in plants, molds, crustaceans, mollusks, and some bacteria which, in the presence of oxygen, catalyzes the oxidation of monophenols and polyphenols with the introduction of ‒OH groups and the formation of quinones.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(ortho-diphenoloxidase), a enzyme of the oxidoreductase class that is present in almost all animals and plants. Tyrosinase catalyzes the oxidation of the amino acid tyrosine into dopa during the biosynthesis of melanins. It takes part in the synthesis of epinephrine and in other metabolic processes. Hereditary disruption of tyrosinase activity or the absence of tyrosinase causes albinism. Tyrosinase has been found to be identical to polyphenoloxidase.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Developmental phenotypic-genotypic associations of tyrosinase and melanocortin 1 receptor genes with changing profiles in chicken plumage pigmentation.
Plants as a Source of Tyrosinase. Tyrosinase from various fruits and vegetables has been studied and the enzyme has been extracted from Monastrell grape (Janovitz-Klapp et al.
Although sample N1 showed no antimelanogenic activity, it should be noted that its tyrosinase activity observed in the present study indicates its indirect role as an antimelanogenic agent due the involvement of the tyrosinase enzyme in melanogenesis (Aumeeruddy et al 2017).
Polypeptide composition of two fungal tyrosinases. Phytochemistry., 1981; 20: 1481-1485.
(45) However, there are no previous works on the AChE, tyrosinase, [alpha]-glucosidase inhibitory effects and oxidative DNA damage protective effects of various extracts of C.
They inhibit tyrosinase transcription and increase cell turnover.
For tyrosinase inhibition, the proso millet solution was diluted with deionized water into a series of solutions (6.25, 12.5, 17.5, 20, and 25 mg/mL).
Tyrosinase (EC, a coppercontaining enzyme that is crucial for melanin production [29], oxidizes monophenol (tyrosine) to odiphenol L-DOPA and subsequently to o-quinone dopachrome, which then undergoes chemical and enzymatic reactions to yield melanin [30].