Definitions for tyrosinaseˈtaɪ roʊ sɪˌneɪs, -ˌneɪz, ˈtɪr oʊ-
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An enzyme, similar to catechol oxidase, that catalyzes the production of phenolic pigments such as melanin.
In molecular biology, Tyrosinase refers to an oxidase, which is the rate limiting enzyme for controlling the production of melanin. It is mainly involved in two distinct reactions of melanin synthesis; firstly, the hydroxylation of a monophenol and secondly, the conversion of an o-diphenol to the corresponding o-quinone. o-Quinone undergoes several reactions to eventually form melanin. Tyrosinase is a copper-containing enzyme present in plant and animal tissues that catalyzes the production of melanin and other pigments from tyrosine by oxidation, as in the blackening of a peeled or sliced potato exposed to air. It is found inside melanosomes. In humans, the tyrosinase enzyme is encoded by the TYR gene.
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