果糖基转移酶<i>Ao</i>FT在毕赤酵母中的表达与纯化及其酶学性质研究

魏涛; 赵彩梦; 郏未未; 黄申; 毛多斌

doi:10.12187/2020.03.001

果糖基转移酶AoFT在毕赤酵母中的表达与纯化及其酶学性质研究

1. 郑州轻工业大学食品与生物工程学院, 河南郑州 450001;
2. 河南省食品生产与安全协同创新中心, 河南郑州 450001

作者简介: 魏涛(1980-),男,河南省卫辉市人,郑州轻工业大学教授,博士,主要研究方向为食品生物技术.;

基金项目: 国家自然科学基金项目（21406210）；河南省高校科技创新人才项目（18HASTIT040）；河南省留学人员科技活动项目（2019-3）
中图分类号: TS41⁺3

Expression and purification of fructosyl transferase AoFT in Pichia pastoris and study on its enzymatic properties

1. College of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China;
2. He'nan Collaborative Innovation Center for Food Production and Safety, Zhengzhou 450001, China
Received Date: 2019-12-12

CLC number: TS41⁺3

摘要: 利用基因工程技术方法，将构建的重组质粒pPICZαA-AoFT线性化后，经电转化导入毕赤酵母X33（Pichia pastoris X33）中，构建重组毕赤酵母工程菌pPICZαA-AoFT/X33，实现果糖基转移酶AoFT在毕赤酵母中的表达，进而研究纯化后的果糖基转移酶AoFT的酶学性质.结果表明：pPICZαA-AoFT/X33随发酵时间的增加而快速繁殖，菌体OD₆₀₀值于发酵时长120 h时达到峰值，此时发酵液胞外总蛋白质量浓度为1.64 mg/mL；纯化后的果糖基转移酶AoFT的比活力为71.4 U/mg，产率达70.6%；PNGase F酶切反应证实纯化后的果糖基转移酶AoFT发生了N-糖基化反应；果糖基转移酶AoFT的最适反应温度为45℃，最适缓冲体系为醋酸钠缓冲液（pH值为4.5~6.0）；金属离子Mn²⁺，Ca²⁺对果糖基转移酶AoFT具有激活作用，而Al³⁺，Fe²⁺，Ni²⁺，Zn²⁺和EDTA对果糖基转移酶AoFT具有抑制作用；表面活性剂SDS，吐温20和Triton X-100对果糖基转移酶AoFT的酶活性影响较小，还原剂DTT对果糖基转移酶AoFT的酶活性具有明显的抑制作用，酶抑制剂PMSF低浓度时对果糖基转移酶AoFT的酶活性无显著影响，高浓度时可使酶活性降低；果糖基转移酶AoFT对有机溶剂乙醇、二甲基亚砜、二甲基甲酰胺、正丁醇、正己烷和甲苯具有较强的抗性.
- 果糖基转移酶 /
- 毕赤酵母 /
- 表达 /
- 纯化 /
- 酶学性质
Abstract: Using genetic engineering techniques,the recombinant plasmid pPICZαA-AoFT was linearized,and then electroporated into Pichia pastoris X33 to construct recombinant Pichia pastoris engineering strain pPICZαA-AoFT/X33 and achieve the recombinant fructosyl transferase AoFT in Pichia pastoris.Furthermore,the enzymatic properties of the purified fructosyl transferase AoFT were studied.The results showed that the pPICZαA-AoFT/X33 multiplied rapidly with the increase of fermentation time.The OD₆₀₀ value of the cell reached a peak at 120 h,and the total protein concentration of the extracellular protein in the fermentation broth was 1.64 mg/mL.The specific activity of the purified fructosyl transferase AoFT enzyme was 71.4 U/mg,and the yield was 70.6%.The peptide N-glycosidase F digestion reaction confirmed that the purified fructosyl transferase AoFT had some N-glycosylation sites.The optimal reaction temperature of fructosyl transferase AoFT was 45 ℃,and the optimal buffer system was sodium acetate buffer (pH value was 4.5~6.0).Metal ions Mn²⁺ and Ca²⁺ could activate fructosyl transferase AoFT,while Al³⁺,Fe²⁺,Ni²⁺,Zn²⁺ and EDTA could inhibit fructosyl transferase AoFT.Surfactants (SDS,Tween-20 and Triton X-100) had little effect on the activity of fructosyl transferase AoFT,while the reductant DTT had obvious inhibition effect on the activity of fructosyl transferase AoFT.The low concentration of PMSF had no significant effect on the activity of fructosyl transferase,but the high concentration could reduce the activity.The activity of fructosyl transferase AoFT showed strong resistance to organic solvents (ethanol,DMSO,dimethylformamide,n-butanol,n-hexane and toluene).
- fructosyl transferase /
- Pichia pastoris /
- expression /
- purification /
- enzymatic property
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沈阳化工大学材料科学与工程学院沈阳 110142

果糖基转移酶AoFT在毕赤酵母中的表达与纯化及其酶学性质研究

作者简介: 魏涛(1980-),男,河南省卫辉市人,郑州轻工业大学教授,博士,主要研究方向为食品生物技术.;

Expression and purification of fructosyl transferase AoFT in Pichia pastoris and study on its enzymatic properties

计量

通讯作者: 陈斌, bchen63@163.com

果糖基转移酶AoFT在毕赤酵母中的表达与纯化及其酶学性质研究

作者简介:魏涛(1980-),男,河南省卫辉市人,郑州轻工业大学教授,博士,主要研究方向为食品生物技术.

English Abstract

Expression and purification of fructosyl transferase AoFT in Pichia pastoris and study on its enzymatic properties

目录

果糖基转移酶AoFT在毕赤酵母中的表达与纯化及其酶学性质研究

作者简介: 魏涛(1980-),男,河南省卫辉市人,郑州轻工业大学教授,博士,主要研究方向为食品生物技术.;

Expression and purification of fructosyl transferase AoFT in Pichia pastoris and study on its enzymatic properties

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通讯作者: 陈斌, bchen63@163.com

果糖基转移酶AoFT在毕赤酵母中的表达与纯化及其酶学性质研究

作者简介:魏涛(1980-),男,河南省卫辉市人,郑州轻工业大学教授,博士,主要研究方向为食品生物技术.

English Abstract

Expression and purification of fructosyl transferase AoFT in Pichia pastoris and study on its enzymatic properties

目录