Inhibitory effects of cis- and trans-isomers of 3,5-dihydroxystilbene on the activity of mushroom tyrosinase

Biochemical and Biophysical Research Communications
Kang-Kang SongQing-Xi Chen

Abstract

The effects of cis- and trans-isomers of 3,5-dihydroxystilbene on the activity of mushroom tyrosinase have been studied. The results show that both cis- and trans-isomers of 3,5-dihydroxystilbene can inhibit the diphenolase activity of the enzyme and the inhibition type was reversible. The IC(50) values were estimated as 0.405+/-0.013 and 0.705+/-0.017 mM, respectively. Kinetic analysis showed that the inhibition of cis-3,5-dihydroxystilbene and trans-3,5-dihydroxystilbene on the diphenolase activity of the enzyme belonged to competitive type, and the inhibition constants (K(I)) were determined to be 0.232+/-0.015 and 0.395+/-0.020 mM, respectively. In this investigation, the inhibitory effects of cis-3,5-dihydroxystilbene and trans-3,5-dihydroxystilbene on the diphenolase activity of mushroom tyrosinase were compared. The inhibitory capacity of cis-isomer was stronger than that of corresponding trans-isomer. Nevertheless, the trans-3,5-dihydroxystilbene was used more frequently than its corresponding cis-form compound. This research may offer some references for designing and synthesizing some novel and effective tyrosinase inhibitors. Furthermore, it may improve the use of stilbenes on the field of food preservation and depig...Continue Reading

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