Shang-Jun Yin, Yue-Xiu Si, Zhi-Jiang Wang, Su-Fang Wang, Sangho Oh, Sanghyuk Lee, Seon-Mi Sim, Jun-Mo Yang, Guo-Ying Qian, Jinhyuk Lee, Yong-Doo Park
College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo 315100, P. R. China.
Journal of biomolecular structure & dynamics 2011 DecTyrosinase plays various roles in organisms and much research has focused on the regulation of tyrosinase activity. We studied the inhibitory effect of thiobarbituric acid (TBA) on tyrosinase. Our kinetic study showed that TBA inhibited tyrosinase in a reversible noncompetitive manner (K(i) 5 14.0 ± 8.5 mM and IC₅₀ 5 8.0 ± 1.0 mM). Intrinsic and ANS-binding fluorescences studies were also performed to gain more information regarding the binding mechanism. The results showed that no tertiary structural changes were obviously observed. For further insight, we predicted the 3D structure of tyrosinase and simulated the docking between tyrosinase and TBA. The docking simulation was successful with significant scores (binding energy for AutoDock4: -5.52 kcal/mol) and suggested that TBA was located in the active site. The 11 ns molecular dynamics simulation convinced that the four HIS residues (residue numbers: 57, 90, 250, and 282) were commonly responsible for the interaction with TBA. Our results provide a new inhibition strategy that works using an antioxidant rather than targeting the copper ions within the tyrosinase active site.
Shang-Jun Yin, Yue-Xiu Si, Zhi-Jiang Wang, Su-Fang Wang, Sangho Oh, Sanghyuk Lee, Seon-Mi Sim, Jun-Mo Yang, Guo-Ying Qian, Jinhyuk Lee, Yong-Doo Park. The effect of thiobarbituric acid on tyrosinase: inhibition kinetics and computational simulation. Journal of biomolecular structure & dynamics. 2011 Dec;29(3):463-70
PMID: 22066533
View Full Text