食品科学

• 生物工程 • 上一篇    下一篇

黄曲霉毒素B1降解酶的分离纯化及其酶学特性

杨文华,李海星,刘晓华,曹郁生   

  1. 食品科学与技术国家重点实验室,南昌大学中德联合研究院,江西 南昌 330047
  • 出版日期:2014-10-15 发布日期:2014-10-17

Purification and Characteristics of an Aflatoxin B1-Degrading Enzyme from Pseudomonas stutzeri F4

YANG Wen-hua, LI Hai-xing, LIU Xiao-hua, CAO Yu-sheng   

  1. State Key Laboratory of Food Science and Technology, Sino-German Joint Research Institute,Nanchang University, Nanchang 330047, China
  • Online:2014-10-15 Published:2014-10-17

摘要:

施氏假单胞菌(Pseudomonas stutzeri)F4能产生黄曲霉毒素B1的降解酶(aflatoxin B1-degrading enzyme,ADE),本实验通过3 步法提取纯化ADE,即包括硫酸铵分级沉淀、DEAE-Sepharose阴离子交换柱层析和SephadexG-100凝胶过滤层析。结果表明,通过以上纯化方法,ADE的回收率为56%,纯化的ADE比活力为6.4×104 U/mg,纯化了123 倍。利用十二烷基硫酸钠-聚丙烯酰胺凝胶电泳测得ADE分子质量约为24 kD;ADE与AFB1反应的最适温度和pH值分别为30 ℃和6.0;Cu2+对ADE酶活性有抑制作用;利用双倒数作图法测得ADE表观Km值为5.61×10-5 mol/L。

关键词: 施氏假单胞菌F4, 黄曲霉毒素B1降解酶, 分离纯化, 特性

Abstract:

Aflatoxin B1 (AFB1)-degrading enzyme (ADE) was purified from Pseudomonas stutzeri F4 by a three-step
procedure including ammonium sulfate fractional precipitation and chromatography on DEAE-Sepharose and Sephadex
G-100. A total of 123-fold purification of ADE with a recovery of 56% and an ultimate specific activity of 6.4 × 104 U/mg
were achieved. The apparent molecular mass of ADE was estimated to be about 24 kD by SDS-PAGE. The ADE displayed
the highest degradation activity for AFB1 at 30 ℃ and pH 6.0. Cu2+ exhibited strong inhibitory activity with an apparent Km
of 5.61 × 10-5 mol/L as indicated by the double-reciprocal plot.

Key words: Pseudomonas stutzeri F4, aflatoxin B1(AFB1)-degrading enzyme, purification, characteristics

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