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  • Title: 5-S-cysteinyldopa as a substrate for tyrosinase.
    Author: Hansson C, Rorsman H, Rosengren E.
    Journal: Acta Derm Venereol; 1980; 60(5):399-402. PubMed ID: 6162310.
    Abstract:
    Oxidation of 5-S-cysteinyldopa by mushroom tyrosinase was studied by measuring 5-S-cysteinyldopa consumption with HPLC. 5-S-cysteinyldopa was found to be a substrate for tyrosinase, but our results suggests that a self-catalysed oxidation induced by enzymatically formed 5-S-cysteinyl dopaquinone also takes place. Dopa oxidation by tyrosinase was determined by measuring substrate consumption with HPLC. The oxidation of 5-S-cysteinyldopa was markedly accelerated in the presence of dopa. This could be explained by dopaquinone oxidation of 5-S-cysteinyldopa, which has a lower oxidation potential than dopa.
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