天然产物研究与开发 ›› 2021, Vol. 33 ›› Issue (10): 1735-1740.doi: 10.16333/j.1001-6880.2021.10.014

• 开发研究 • 上一篇    下一篇

柑橘黄酮对胰蛋白酶活性的抑制及作用机制初探

李继伟*,柯奥,李炜玮,邱士文,颜靖   

  1. 武汉设计工程学院食品与生物科技学院,武汉 430205
  • 出版日期:2021-10-28 发布日期:2021-10-28
  • 基金资助:
    国家自然科学基金面上项目(31871530);湖北省教育厅科学研究项目(B2017368);国家级大学生创新创业项目(201914035001)

Inhibitory effect of citrus flavonoids on trypsin activity and preliminary study on its mechanism

LI Ji-wei*,KE Ao,LI Wei-wei,QIU Shi-wen,YAN Jing   

  1. College of Food & Biological Science and Technology,Wuhan Institute of Design and Sciences,Wuhan 430205,China
  • Online:2021-10-28 Published:2021-10-28

摘要: 研究柑橘黄酮对胰蛋白酶催化活性、酶促反应动力学参数的影响,并通过荧光光谱法研究柑橘黄酮与胰蛋白酶的结合机制。结果表明,柑橘黄酮对胰蛋白酶具有明显的抑制作用,且呈现浓度效应,37 ℃时,0.66 mg/mL的柑橘黄酮对胰蛋白酶的抑制率为29.9%,柑橘黄酮对胰蛋白酶的抑制属于竞争性抑制和非竞争性抑制混合抑制类型。荧光光谱实验结果表明,柑橘黄酮(柚皮苷)使胰蛋白酶的内源荧光发生猝灭,猝灭类型为静态猝灭,293 K下,二者的结合常数Ka为1.1×106 L/mol,结合位点数n为1.34,热力学参数显示两者结合的作用力主要为氢键和范德华力。


关键词: 柑橘黄酮, 胰蛋白酶, 酶学性质, 荧光光谱

Abstract:

The effects of citrus flavonoids on the catalytic activity and kinetic parameters of trypsin were studied.The results showed that citrus flavonoids had obvious inhibitory effect on trypsin,and the inhibition showed concentration effect.At 37 ℃,the inhibitory rate of 0.66 mg/mL citrus flavonoids against trypsin was 29.9%.The inhibition belonged to the mixed inhibition type of competitive and non-competitive inhibition.The fluorescence spectra showed that citrus flavone (naringin) quenched the endogenous fluorescence of trypsin in a static quenching mode.At room temperature (293 K),the binding constant Ka was 1.1×106 L/mol,and the number of binding sites nwas 1.34.The thermodynamic parameters showed that hydrogen bond and van der Waals force played a dominant role in the interaction between trypsin and citrus flavonoids.

Key words: citrus flavonoids, trypsin, enzymatic properties, fluorescence spectrum 

中图分类号:  TS209 R932