Tyrosinase inhibition studies are needed due to the agricultural and medicinal applications. For probing effective inhibitors of tyrosinase, a combination of computational prediction and enzymatic assay via kinetics were important. We predicted the 3D structure of tyrosinase from Agaricus bisporus, used a docking algorithm to simulate binding between tyrosinase and terephthalic acid (TPA) and studied the reversible inhibition of tyrosinase by TPA. Simulation was successful (binding energies for Autodock4 = -1.54 and Fred2.0 = -3.19 kcal/mol), suggesting that TPA interacts with histidine residues that are known to bind with copper ions at the active site. TPA inhibited tyrosinase in a mixed-type manner with a K i = 11.01 ± 2.12 mM. Measurements of intrinsic and ANS-binding fluorescences showed that TPA induced no changes in tertiary structure. The present study suggested that the strategy of predicting tyrosinase inhibition based on hydroxyl groups and orientation may prove useful for screening of potential tyrosinase inhibitors.
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Acknowledgments This research was supported by Consultation Program funded by the Science and Technology Department of Zhejiang Province (2008C0200-2). Dr. Jun-Mo Yang was supported by the grants of the Korea Health 21 R&D Project (Ministry of Health, Welfare and Family Affairs, Republic of Korea, 01-PJ3-PG6-01GN12-0001 and A030003). Dr. Yong-Doo Park was supported by a grant from the project of Zhejiang Provincial Natural Science Foundation of China (Grant No. Y2091212).
- Docking simulation
- Hydroxyl group
- Inhibition kinetics
- Terephthalic acid