吉林大学学报(医学版)

• 基础研究 • 上一篇    下一篇

木糖氧化产碱菌中亚硝酸盐还原酶基因的克隆与表达

张雪,陈萍,毕云枫,曲宁宁,刘琼,孙鑫泽   

  1. (吉林农业大学食品科学与工程学院,吉林 长春 130118)
  • 收稿日期:2012-09-20 出版日期:2013-07-28 发布日期:2013-07-28
  • 通讯作者: 陈 萍 E-mail:(Tel:0431-84533312,E-mail: ccchenping@sina.com)
  • 作者简介:张 雪(1987-),女,吉林省公主岭市人,在读食品科学硕士,主要从事食品微生物与生物技术方面的研究。 

Cloning and expression of nitrite reductase gene from Alcaligenes xylosoxidans

ZHANG Xue,CHEN Ping,BI Yun-feng,QU Ning-ning,LIU Qiong,SUN Xin-ze   

  1. (College of Food Science and Engineering,Jilin Agricultural University,Changchun 130118,China)
  • Received:2012-09-20 Online:2013-07-28 Published:2013-07-28
  • Supported by:

    吉林省科技厅科研基金资助课题(20120249)

摘要:

目的:对木糖氧化产碱菌中亚硝酸盐还原酶基因(nir)进行克隆并表达,并测定酶的活力,探讨亚硝酸盐还原酶(NiR)对亚硝酸盐的降解特性。方法:提取木糖氧化产碱菌DNA,根据GenBank公布的nir基因序列设计引物,利用PCR技术扩增nir基因,克隆至表达载体pET-28a中,构建重组质粒pET-28a-nir,通过双酶切和测序鉴定后,将阳性重组质粒转化到大肠杆菌BL21(DE3)中,经IPTG诱导表达,获得重组蛋白。将细胞发酵液超声破碎,提取粗酶,测定酶活力。结果:经PCR扩增及测序鉴定得到长度为1 083 bp的目的片段;经终浓度0.6 mmol?L-1IPTG、30℃诱导表达5 h,获得相对分子质量为37 000的重组蛋白;在pH6.5、反应温度35℃时,测得酶活力为51.74 U•mL-1。结论:成功克隆nir基因,在大肠杆菌BL21(DE3)中获得表达,且表达产物有酶活。

 

关键词: 亚硝酸盐还原酶, 克隆, 基因表达

Abstract:

Abstract:Objective
To clone and express the nitrite reductase gene  (nir)  from Alcaligenes xylosoxidans and detect the enzyme activity,and to explore the  degration characteristics of the nitrite reductase(NiR) on nitrite.Methods The DNA from Alcaligenes xylosoxidans was purified.The primers were designed according to nir sequences in GenBank.The nir gene was amplified by PCR and cloned into expression vector pET-28a.The recombinant plasmid pET-28a-nir was constructed.After the identification of restriction digestion and sequencing,the positive recombinant plasmid was transferred into E.coli BL21(DE3).The recombinant protein was obtained by induction.The cell fermentation was broken with ultrasonic.The crude enzyme was extracted and the enzyme activity was calculated.Results A 1 083 bp DNA fragment was obtained by PCR.The target gene was induced by IPTG with the final concentration of 0.6 mmol?L-1 at 30℃,and the induction time was 5 h.A kind of recombinant protein with the molecular weight of 37 000 was obtained.Under the condition of pH 6.5 and reaction temperature 35℃,the enzyme activity was 51.74 U•mL-1.Conclusion Nitrite reductase gene is successfully cloned and expressed in E.coli BL21(DE3).The expression product has enzyme activity.

Key words: nitrite reductase, clone, gene expression

中图分类号: 

  • Q78