The College of Chemistry, Changchun Normal University, Changchun, China.
Biotechnol Appl Biochem. 2022 Aug;69(4):1327-1338. doi: 10.1002/bab.2205. Epub 2021 Jun 9.
The inhibitory effects of delphinidin-3-O-galactoside (DG) on the activities of tyrosinase (EC 1.14.18.1) (TY) from the edible Agaricus bisporus mushroom were investigated by enzyme kinetics, multispectroscopic methods, and molecular docking. As a result, DG showed strong inhibition on TY with the IC of 34.14 × 10 mol L . The inhibition mode of DG against TY was mixed type with α values of 5.09. The binding constant K and related thermodynamic parameters at the three different temperatures showed that the fluorescence quenching of TY by DG was static quenching. Synchronous fluorescence, three-dimensional fluorescence, ultraviolet-visible spectroscopy, and circular dichroism spectroscopies confirmed that the conformation or microenvironment of the TY protein were changed after binding with DG. Molecular docking revealed that DG had strong binding affinity to TY through hydrogen bonding and van der Waals force, and the results were consistent with the fluorescence data. Our findings suggested that DG may be potential TY inhibitor.
花色苷-3-O-半乳糖苷(DG)对可食用双孢蘑菇酪氨酸酶(EC 1.14.18.1)(TY)活性的抑制作用通过酶动力学、多光谱方法和分子对接进行了研究。结果表明,DG 对 TY 表现出强烈的抑制作用,IC 为 34.14×10-6mol/L。DG 对 TY 的抑制模式为混合抑制型,α 值为 5.09。在三个不同温度下的结合常数 K 和相关热力学参数表明,DG 对 TY 的荧光猝灭是静态猝灭。同步荧光、三维荧光、紫外-可见光谱和圆二色光谱证实,DG 与 TY 结合后,TY 蛋白的构象或微环境发生了变化。分子对接表明,DG 通过氢键和范德华力与 TY 具有很强的结合亲和力,这与荧光数据一致。我们的研究结果表明,DG 可能是一种潜在的 TY 抑制剂。