F1Fo-ATP 合酶是自然界中研究最好的大分子机器之一。它可以被一系列小分子抑制,其中包括多酚、白藜芦醇和 piceatannol。在这里,我们介绍了 ATP 合酶的光开关抑制剂,称为 PIAS,它们是从这些多酚合成衍生而来的。它们可用于通过光可逆地控制纯化酵母解脂耶氏酵母 ATP 合酶的酶活性。我们的实验表明,PIAS 与 ATP 合酶 F1 复合体中的反式多酚结合到相同的位点,但它们不以顺式形式结合。PIAS 可以成为在各种生化和生物技术应用中对 ATP 合酶进行光学精确控制的有用工具。
Synthesis of novel azo-resveratrol, azo-oxyresveratrol and their derivatives as potent tyrosinase inhibitors
摘要:
Ten azo compounds including azo-resveratrol (5) and azo-oxyresveratrol (9) were synthesized using a modified Curtius rearrangement and diazotization followed by coupling reactions with various phenolic analogs. All synthesized compounds were evaluated for their mushroom tyrosinase inhibitory activity. Compounds 4 and 5 exhibited high tyrosinase inhibitory activity (56.25% and 72.75% at 50 mu M, respectively). The results of mushroom tyrosinase inhibition assays indicate that the 4-hydroxyphenyl moiety is essential for high inhibition and that 3,5-dihydroxyphenyl and 3,5-dimethoxyphenyl derivatives are better for tyrosinase inhibition than 2,5-dimethoxyphenyl derivatives. Particularly, introduction of hydroxyl or methoxy group into the 4-hydroxyphenyl moiety diminished or significantly reduced mushroom tryosinase inhibition. Among the synthesized azo compounds, azo-resveratrol (5) showed the most potent mushroom tyrosinase inhibition with an IC50 value of IC50 = 36.28 +/- 0.72 mu M, comparable to that of resveratrol, a well-known tyrosinase inhibitor. (C) 2012 Elsevier Ltd. All rights reserved.