单词	tyrosinase
释义	tyrosinase /ˈtʌɪrəsɪneɪz / /tʌɪˈrɒsɪneɪz/ noun [mass noun] Biochemistry A copper-containing enzyme which catalyses the formation of quinones from phenols and polyphenols (e.g. melanin from tyrosine).The copper-containing enzyme tyrosinase catalyzes the rate-limiting step in melanogenesis.... However, during infection and damage phenols and oxidases, such as peroxidase and tyrosinase, become decompartmentalized and could oxidize phenolic compounds to form antimicrobial quinones. It is an incurable congenital condition, due in its total form to absence of the enzyme tyrosinase, which is required for melanin to be synthesized in specialized cells - the melanocytes. Origin Late 19th century: from tyrosine + -ase.
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