生物技术通报 ›› 2014, Vol. 0 ›› Issue (9): 157-163.

• 研究报告 • 上一篇    下一篇

氧化葡萄糖酸杆菌中5-葡萄糖酸脱氢酶基因的克隆、表达及酶学性质分析

李翎,许琳,魏淼,李艳,严明   

  1. 南京工业大学生物与制药工程学院,南京 211816
  • 收稿日期:2014-02-08 出版日期:2014-09-15 发布日期:2014-09-07
  • 作者简介:李翎,女,硕士研究生,研究方向:基因工程与工业生物催化;E-mail:421247797@qq.com
  • 基金资助:
    国家重点基础研究发展计划(“973”计划)(2011CBA00804),国家高技术研究发展计划(“863”计划)(2012AA022101),江苏高校优势学科建设工程资助项目

Cloning,Expression and Characterization of Gluconate 5-dehydrogenase from Gluconobacter oxydans

Li Ling, Xu Lin,Wei Miao, Li Yan, Yan Ming   

  1. College of Biotechnology and Pharmaceutical Engineering,Nanjing Tech University,Nanjing 211816
  • Received:2014-02-08 Published:2014-09-15 Online:2014-09-07

摘要: 根据NCBI上的报道的基因序列设计引物,以氧化葡萄糖酸杆菌(Gluconobacteroxydans)H24的基因组为模板,获得5-葡萄糖酸脱氢酶(Ga5DH)基因,将其与表达载体pET-28a连接,构建重组质粒pET-28a-Ga5DH,并转化大肠杆菌Rosetta进行表达。SDS-PAGE检测结果显示,表达蛋白的分子大小为26.5kD,纯化后酶活达7.83U/mg。酶学性质分析表明,该酶的最适反应温度为40℃,最适pH为11。在pH9-11的缓冲中保温8h,酶活力仍有80%以上的残余。该酶对多种有机溶剂具有良好的耐受性。

关键词: 5-葡萄糖酸脱氢酶, 氧化葡萄糖酸杆菌, 表达, 酶学性质

Abstract: Guconate 5-dehydrogenase gene from Gluconobacter oxydans H24 was amplified with primes designed based on NCBI database published sequence information. Ga5DH was cloned and expressed in Escherichia coli Rosetta strain. Results showed that the molecular mass of the enzyme was 26.5 kD by SDS-PAGE gel analysis. After purification, the enzyme activity could reach 7.83 U/mg. It was suggested that the recombinant protein had a maximum activity at 40℃, pH 11. The characterization of purified enzyme indicated that Ga5DH was highly resistant to organic solvents.

Key words: Gluconate 5-dehydrogenase, Gluconobacter oxydans, Expression, Enzymatic properties