食品科学 ›› 2007, Vol. 28 ›› Issue (7): 304-308.

• 生物工程 • 上一篇    下一篇

蜜蜂α-葡萄糖苷酶的分离纯化及其酶学性质研究

 王志江, 魏红福   

  1. 浙江万里学院生物与环境学院; 西南科技大学生命科学与工程学院 浙江宁波315100; 四川绵阳621010;
  • 出版日期:2007-07-15 发布日期:2011-10-24

Purification and Characterization of α-glucosidase Extracted from Honey Bee

 WANG  Zhi-Jiang, WEI  Hong-Fu   

  1. 1.College of Biological and Environment Sciences, Zhejiang Wanli University, Ningbo 315100, China; 2.College of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
  • Online:2007-07-15 Published:2011-10-24

摘要: 本研究以蜜蜂腹部为材料,通过研磨进行组织破碎,然后硫酸铵沉淀、High Q离子交换层析、疏水作用层析和Superdex G-75凝胶层析,得到的α-葡萄糖苷酶在SDS-PAGE上呈单一蛋白质条带,分子量约为55kDa。以4-硝基苯-α-D-吡喃葡萄糖苷(PNPG)为底物,研究酶催化反应动力学,结果表明:α-葡萄糖苷酶的最适反应pH范围为5.0~6.0,而pH稳定性范围为5.0~10.0。该α-葡萄糖苷酶的热稳定性比较差。其最适反应温度范围在35~45℃内。Zn2+、Mg2+、Mn2+和Fe2+对α-葡萄糖苷酶有激活作用。而Cu2+和Co2+对α-葡萄糖苷酶有抑制作用。酶动力学参数Km和Vmax分别为0.183mmol/L和0.085μmol/min·mg。

关键词:  , 蜜蜂, &alpha, -葡萄糖苷酶, 纯化, 稳定性, 动力学

Abstract: In this paper, α-glucosidase was purified to electrophoresis degree after being extracted from honey bee abdomen with ammonium sulfate precipitation, with High Q chromatography, hydrophobic interaction chromatography and Superdex G- 75 chromatography. Its relative molecular weight is determined to be around 55 kDa by SDS-PAGE. The optimal temperature and pH range are 35~45 ℃ and 5.0~6.0, respectively, but the temperature stability is poor. The pH stability range is 5.0~ 10.0. Zn2+, Mg2+, Mn2+ and Fe2+ can activate the enzyme, however, Cu2+ and Co2+ can cause inhibition, and glucose is also a strong inhibitor. The Vmax value is 0.085 μmol/min·mg and the Km value is 0.183 mmol/L for p-Nitrophenyl-α-D-glucopyranoside(PNPG).

Key words: honey bee; &alpha, -glucosidase; purification; stability; kinetics;