食品科学 ›› 2019, Vol. 40 ›› Issue (11): 70-74.doi: 10.7506/spkx1002-6630-20180503-031

• 基础研究 • 上一篇    下一篇

白藜芦醇对α-葡萄糖苷酶的抑制动力学及抑制机制

姜丽丽,张中民,陈道玉,王 珍,薛宏宇,刘 勇*   

  1. 大连理工大学生命与医药学院,辽宁 盘锦 124221
  • 出版日期:2019-06-15 发布日期:2019-06-28
  • 基金资助:
    辽宁省自然科学基金(博士启动基金)项目(201601033)

Inhibition Kinetics and Mechanisms of Resveratrol on α-Glucosidase

JIANG Lili, ZHANG Zhongmin, CHEN Daoyu, WANG Zhen, XUE Hongyu, LIU Yong*   

  1. School of Life Science and Medicine, Dalian University of Technology, Panjin 124221, China
  • Online:2019-06-15 Published:2019-06-28

摘要: 白藜芦醇因具有广泛的生物活性而备受重视,有报道称白藜芦醇有降血糖的功效。α-葡萄糖苷酶抑制剂能够降低血糖含量,有效防治II型糖尿病。因此,为了确定白藜芦醇的降血糖机制,研究白藜芦醇与α-葡萄糖苷酶活性的关系,本研究采用分光光度法测定α-葡萄糖苷酶活力,采用双倒数作图法研究白藜芦醇的酶抑制动力学,并采用对接模拟方法对白藜芦醇与α-葡萄糖苷酶的结合模式进行探讨。结果表明:白藜芦醇非竞争性地抑制α-葡萄糖苷酶活性,且有较强的抑制作用,半抑制浓度(half maximal inhibitory concentration,IC50)为5.047 μmol/L,抑制常数为5.743 μmol/L,明显强于阳性对照阿卡波糖(IC50=632.6 μmol/L);对接模拟结果表明其与α-葡萄糖苷酶有多种可能的结合模式,且都不影响阿卡波糖与α-葡萄糖苷酶的结合。因此,白藜芦醇有被开发为降糖药物的潜力,也可作为膳食补充剂发挥一定的降血糖功效。

关键词: 白藜芦醇, α-葡萄糖苷酶, 抑制动力学, 分子对接, 同源模建

Abstract: Due to its extensive biological activities such as hypoglycemic effects, resveratrol has gained much attention. Besides, α-glucosidase inhibitors can decrease hyperglycemia, which is closely related to the treatment of type-2 diabetes. In the present study, enzyme-inhibitory kinetics and computer simulation were applied to investigate the effect of resveratrol on the activity of α-glucosidase. The activity of α-glucosidase was measured by spectrophotometry, the inhibition kinetics was investigated using Lineweaver-Burk method, and the binding mechanisms between resveratrol and α-glucosidase were explored using molecular docking simulation. The results indicated that resveratrol was a stronger inhibitor (half maximal inhibitory concentration (IC50) = 5.047 μmol/L) than acarbose (IC50 = 632.6 μmol/L). The inhibition type was noncompetitive, and the value of Ki was 5.743 μmol/L. Molecular docking results demonstrated that the existence of multiple binding modes between resveratrol and α-glucosidase did not affect the binding interaction between acarbose and α-glucosidase. Therefore, resveratrol had potent inhibitory activity against α-glucosidase, and thus had the potential to be developed as an antidiabetic drug or as a dietary supplement in a synergetic manner with acarbose for the treatment of diabetes.

Key words: resveratrol, α-glucosidase, inhibition kinetics, molecular docking, homology modeling

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