The Tyrosinase-Tyrosine Reaction

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Abstract
L-3.4-Dihydroxyphenylalanine has been isolated and identified as a product of the action of tyrosinase (from mealworms) on l-tyrosine. The yield of the pure substance is not more than 3% of the tyrosine oxidised. It is suggested that 3.4-dihydroxyphenylalanine is the first product produced in the tyrosinase-tyrosine reaction and that this on further oxidation produces the red pigment which is characteristic of the reaction. A probable formula for the red pigment is given. In the presence of a small amount of 3.4-dihydroxyphenylalanine the rate of oxidation of tyrosine by tyrosinase is initially increased. This supports the views of Onslow on the mechanism of action of tyrosinase.

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