Abstract
Mushroom tyrosinase (EC 1.14.18.1) is a copper containing oxidase that catalyzes both the hydroxylation of tyrosine into o-diphenols and the oxidation of o-diphenols into o-quinones, and then forms brown or black pigments. In the present study, the effects of some flavonoids on the oxidation of L-3,4-dihydroxyphenylalanine (L-DOPA) have been studied. The results show that flavonoids can lead to reversible inhibition of the enzyme. A kinetic analysis showed that the flavonols are competitive inhibitors, whereas luteolin is an uncompetitive inhibitor. The rank order of inhibition was: quercetin > galangin > morin; fisetin > 3,7,4"-trihydroxyflavone; luteolin > apigenin > chrysin.
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Xie, LP., Chen, QX., Huang, H. et al. Inhibitory Effects of Some Flavonoids on the Activity of Mushroom Tyrosinase. Biochemistry (Moscow) 68, 487–491 (2003). https://doi.org/10.1023/A:1023620501702
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DOI: https://doi.org/10.1023/A:1023620501702