生物技术通报 ›› 2016, Vol. 32 ›› Issue (7): 152-159.doi: 10.13560/j.cnki.biotech.bull.1985.2016.07.023

• 研究报告 • 上一篇    下一篇

点青霉葡萄糖氧化酶基因的克隆及其酶学性质研究

高庆华1, 胡美荣2, 吴芳彤1, 陶勇2, 王云鹏1, 罗同阳1, 胡常英1   

  1. 1. 河北省微生物研究所,保定 071051;
    2. 中国科学院微生物研究所,北京 100101
  • 收稿日期:2015-11-09 出版日期:2016-07-25 发布日期:2016-07-25
  • 作者简介:高庆华,男,博士,研究方向:微生物发酵技术;E-mail:gaoqinghua_mbb@126.com
  • 基金资助:
    河北省科技计划项目(14292804D),河北省科学院科技计划项目(20150503 LR62-3)

Cloning of Gene for a Glucose Oxidase from Penicillium notatum and Its Enzymatic Properties

GAO Qing-hua1, HU Mei-rong2, WU Fang-tong1, TAO Yong2, WANG Yun-peng1, LUO Tong-yang1, HU Chang-ying1   

  1. 1. Institute of Microbiology,Hebei Academy of Sciences,Baoding 071051;
    2. Institute of Microbiology,Chinese Academy of Sciences,Beijing 100101
  • Received:2015-11-09 Published:2016-07-25 Online:2016-07-25

摘要: 旨在克隆点青霉菌(Penicillium notatum)中的葡萄糖氧化酶基因(GOD),在毕赤酵母(Phchia pastoris)中异源表达,纯化并研究其酶学性质。利用PCR技术从点青霉 No.8312菌株的基因组 DNA中克隆得到 GOD基因,将该基因克隆到穿梭载体pMD-AOX上并在毕赤酵母X33中表达,对纯化后的葡萄糖氧化酶的酶学性质进行分析。结果显示,X33-GOD可高表达具有活性的GOD,在30℃、pH6.5的条件下,其培养液上清GOD酶活可达496 U/mL,比活123.0 U/mg;重组表达的葡萄糖氧化酶最适温度为40-45℃,最适pH为6.0,酶的稳定性研究表明,该酶在pH3.5-7.0区间和温度低于50℃下稳定。1 mmol/L Zn2+对其有激活作用;Ag+对该酶活性有较大抑制作用。构建出GOD的高产毕赤酵母工程菌株,与点青霉GOD相比,具有更高的发酵酶活和 比活。

关键词: 葡萄糖氧化酶, 点青霉菌, 重组表达

Abstract: The purpose of this work is to clone the gene of glucose oxidase(GOD)from Penicillium notatum,which was then in heterologous expression in Pichia pastoris,and the enzymatic properties of purified proteins were studied. GOD gene was cloned from genome DNA of P. notatum No. 8312 strain using PCR technique,the gene was ligated to the vector pMD-AOX and then expressed in strain X33 of P. pastoris,and finally the enzymatic properties of the purified proteins were analyzed. As results,the strain X33-GOD highly expressed the GOD with activity. Its activity of GOD in cultured supernatant reached 496 U/mL and the specific activity was 123.0 U/mg at 30℃ and pH6.5. The optimal temperature and pH of recombinant GOD was 40-45℃ and 6.0 respectively. The result of stability of the enzyme showed that the enzyme was stable when the temperature under 50℃ and the pH3.5-7.0,and it can be activated by 1 mmol/L Zn2+ and obvious inhibited by Ag+. The recombinant engineering P. pastoris strain with high-yield GOD has a higher fermentation activity and specific activity compared with GOD from P. notatum.

Key words: glucose oxidase, Penicillium notatum, recombinant expression