Kinetics of Ergothioneine Inhibition of Mushroom Tyrosinase |
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Authors: | Wayne C Liao Wen Hong Wu Pei-Chuan Tsai Hui-Feng Wang Yi-Hsin Liu Chin-Feng Chan |
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Institution: | (1) Department of Nursing, Chang Gung Institution of Technology, Chia-Yi, Taiwan;(2) Plastic and Reconstructive Cosmetic Surgery Center, Kuang Tien General Hospital, Taichung, Taiwan;(3) Department of Applied Cosmetology, Hungkuang University, Shalu District, Taichung, 433, Taiwan; |
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Abstract: | The native amino acid ergothioneine, a thiourea derivative of histidine, inhibits mushroom tyrosinase activity in a dose-dependent
manner, with an IC50 value of 1.025 mg/ml (4.47 mM). By contrast, histidine exhibited no inhibitory effect on mushroom tyrosinase activity. We
characterized ergothioneine as a noncompetitive tyrosinase inhibitor using a Lineweaver–Burk plot of experimental kinetic
data. The IC50 value for ergothioneine scavenging of 2,2-diphenyl-1-picrylhydrazyl was 6.110 ± 0.305 mg/ml, much higher than the IC50 for inhibition of tyrosinase activity which indicating ergothioneine on tyrosinase shows a weak correlation to its antioxidative
activity. The results demonstrated that ergothioneine has a potent inhibition effect on tyrosinase enzyme activity, resulting
from the presence of the sulfur substituted imidazole ring in ergothioneine. |
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