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研究报告

酿酒酵母醛酮还原酶的克隆表达和酶学性质研究

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  • 浙江工业大学生物工程学院,浙江杭州310014
应向贤(1975—),男,浙江永康人,副教授,博士,研究方向为生物催化,E-mail:yingxx@zjut.edu.cn.

基金资助

浙江省新苗人才计划项目(2016R403074);浙江省自然科学基金资助项目(LY17B020012

Cloning,over-expression and characterization of an aldo-keto   reductase fromSaccharomyces cerevisiae CICC 1002

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  • College of Biotechnology and Bioengineering,Zhejiang University of Technology,Hangzhou 310014,China

摘要

从酿酒酵母(Saccharomyces cerevisiae)CICC 1002基因组中克隆获得醛酮还原酶基因,并在大肠杆菌BL21(DE3)中实现过量表达.重组醛酮还原酶经Ni-NTA亲和层析分离纯化获得高纯度目的蛋白,并对其进行酶学性质表征.该重组酶经SDS-PAGE检测为单一条带,分子量为38kDa.该酶的最适pH 和最适温度分别为6.0,60℃,且具有良好的稳定性.1mmol/L金属离子Co2+ 或Ni 2+ 显著提高酶活力.底物特异性分析表明:该重组酶对邻位二酮具有较高活力,其中对酮基泛解酸内酯的比酶活可达20.53U/mg.

本文引用格式

应向贤,高 亮,张 丽,毛王伟,赵 嫚,汪 钊 . 酿酒酵母醛酮还原酶的克隆表达和酶学性质研究[J]. 发酵科技通讯, 2017 , 46(3) : 129 -133 . DOI: 10.16774/j.cnki.issn.1674-2214.2017.03.001

Abstract

The gene encoding an aldo-keto reductase from Saccharomyces cerevisiae CICC 1002  (SceAKR3C1)was cloned and over-expressed in Escherichia coli BL21(DE3).The recombinant   aldo-keto reductase SceAKR3C1was purified by Ni-NTA affinity chromatography and a single   band corresponding to a molecular weight of 38kDa was observed on the SDS-PAGE.The   enzymatic properties were characterized.The optimum pH and temperature of SceAKR3C1were   6.0and 60 ℃,respectively,and the metal ions Co2+ and Ni 2+significantly increased the
enzymatic activity.The substrate spectrum analysis indicated that the recombinant SceAKR3C1   had high activity on vicinal diketones, with a specific activity of 20.53 U/mg using   ketopantolactone as substrate.
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