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Inhibition mechanism of dihydromyricetin on tyrosinase and the joint effects of vitamins B6, D3 or E

Abstract

Inhibition of tyrosinase activity may suppress the production of melanin in the human body. Dihydromyricetin (DMY), a natural flavonoid, was found to effectively inhibit tyrosinase activity in a mixed–type manner with an IC50 value of (3.66 ± 0.14) × 10−5 mol L−1. DMY combined with the dietary vitamins D3 at lower concentrations exhibited a synergistic effect on the inhibition of tyrosinase. The formation of a DMY–tyrosinase complex led to the fluorescence quenching and conformational changes of tyrosinase, which was driven mainly by hydrophobic interactions and hydrogen bonds. The molecular simulation further found that DMY inserted into the active pocket of tyrosinase and interacted with amino acid residues Tyr78, His85, and Ala323, occupying the catalytic center of tyrosinase to hinder entrance of the substrate, leading to the inhibition of tyrosinase. This study may provide a scientific foundation for screening effective tyrosinase inhibitors.

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Publication details

The article was received on 13 Feb 2017, accepted on 19 Jun 2017 and first published on 19 Jun 2017


Article type: Paper
DOI: 10.1039/C7FO00236J
Citation: Food Funct., 2017, Accepted Manuscript
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    Inhibition mechanism of dihydromyricetin on tyrosinase and the joint effects of vitamins B6, D3 or E

    M. Fan, G. Zhang, J. Pan and D. Gong, Food Funct., 2017, Accepted Manuscript , DOI: 10.1039/C7FO00236J

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