›› 2012, Vol. 14 ›› Issue (6): 70-75.DOI: doi:10.3969/j.issn.10080864.2012.06.12

• 生物技术 生命科学 • 上一篇    下一篇

来源于Pseudomonas sp.17对硝基酚降解基因簇中的对苯二醌还原酶基因的克隆和功能鉴定

张双宇,孙雯,许丽,田健,初晓宇,伍宁丰*   

  1. (中国农业科学院生物技术研究所, 北京 100081)
  • 出版日期:2012-12-15 发布日期:2012-12-17
  • 通讯作者: 伍宁丰,研究员,博士生导师,主要从事微生物分子生学与基因工程研究。Tel:01082109844;Email: wunf@caas.net.cn
  • 作者简介:张双宇,博士研究生,研究方向为生物化学与分子生物学。Tel:01082109864;Email:zhangshuangyu2006@126.com。
  • 基金资助:

    国家自然科学基金项目(31170036)资助。

Gene Cloning and Functional Identification of pbenzoquinone Reductase from Pseudomonas sp. 17: A Novel Member of pNitrophenol Degradation Gene Cluster

ZHANG Shuang-yu, SUN Wen, XU Li, TIAN Jian, CHU Xiao-yu, WU Ning-feng*   

  1. (Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China)
  • Online:2012-12-15 Published:2012-12-17

摘要:

Pseudomonas sp. 17 可以利用对硝基酚(PNP)作为唯一的碳源,氮源和能源生长。为了鉴定菌株17代谢PNP的相关基因,本研究构建了菌株17基因组的Fosmid文库,并通过文库的筛选克隆得到一段长为12.3 kb的基因簇序列。序列分析显示,该基因簇中共有7个基因(pdcEDGFCBA)与PNP的代谢相关。其中PdcB与来源于Pseudomonas sp. WBC3中的对苯二醌还原酶(PnpB)有98%的相似性。将pdcB基因在E. coli BL21中过量表达,并通过NiNTA亲和层析纯化重组蛋白PdcB。体外的酶活测定表明,PdcB为一个FAD和NADH依赖型的对苯二醌还原酶,能够催化对苯二醌降解并生成对苯二酚。

关键词: 假单胞菌;对硝基酚;生物修复;对苯二醌还原酶

Abstract:

Pseudomonas sp. 17 utilizes pnitrophenol (PNP) as a sole source of carbon, nitrogen, and energy. In order to identify the genes involved in this utilization, a gene cluster was identified in a 12.3 kb DNA fragment of a genome fosmid library. Sequence analysis revealed that there were 7 genes (pdcEDGFCBA) related in PNP degradation. PdcB shares 98% identity to the pbenzoquinone reductase (PnpB) from Pseudomonas sp. WBC3. The pdcB gene was then overexpressed in E.coli BL21, and the recombinant protein PdcB was further purified with NiNTA affinity chromatography. Purified PdcB was shown a FAD and NADPHdependent pbenzoquinone reductase that catalyzed the reduction of pbenzoquinone to hydroquinone by in vitro activity assays.

Key words: Pseudomonas; , pnitrophenol, bioremediation; , pbenzoquinone reductase

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