论文

生防荧光假单胞菌2P24中EnvZ/OmpR双因子系统克隆与OmpR原核表达

  • 孙冰冰 ,
  • 张伟 ,
  • 段红英 ,
  • 李伟 ,
  • 田涛 ,
  • 张力群
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  • 1. 天津市植物保护研究所, 天津 300381;
    2. 中国农业大学 植物病理学系, 北京 100193;
    3. 天津市西青区植物保护站, 天津 300380
孙冰冰(1986-),女,山东聊城人,助理研究员,硕士,主要从事植物病害生物防治和细菌遗传学。

收稿日期: 2014-03-05

  网络出版日期: 2014-09-19

基金资助

天津市自然科学基金重点项目(12JCZDJC23100);国家高技术研究发展计划项目(2011AA10A205);天津市农科院院长基金项目(11004;13011)

Cloning of EnvZ/OmpR Two-component System from Pseudomonas fluorescens 2P24 and Prokaryotic Expression of OmpR

  • SUN Bing-bing ,
  • ZHANG Wei ,
  • DUAN Hong-ying ,
  • LI Wei ,
  • TIAN Tao ,
  • ZHANG Li-qun
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  • 1. Tianjin Institute of Plant Protection, Tianjin 300381, China;
    2. Department of Plant Pathology, China Agricultural University, Beijing 100193 China;
    3. Plant Protection Station of Xiqing District, Tianjin 300380, China

Received date: 2014-03-05

  Online published: 2014-09-19

摘要

用Mini-Tn5转座子随机突变荧光假单胞菌野生型菌株2P24,得到抗生素2,4二乙酰基间苯三酚(2,4-diacetylphloroglucinol,2,4-DAPG)产量提高的突变体Sesu-25。对转座子侧翼序列分析表明,转座子插入到EnvZ/OmpR双因子系统的反应调节因子 ompR 基因。克隆得到包含完整EnvZ/OmpR系统,全长约为5.9 kb的DNA片段。该双因子系统中的 envZ 基因和 ompR 基因与 P.fluorescens F113的 envZ 基因和 ompR 基因同源性分别为93%和96%。将 ompR 基因克隆到表达载体pET-22b(+)中,得到重组表达载体pET-ompR。将pET-ompR转入 Escherichia coli BL21中得到重组菌株BL21-ompR,用IPTG诱导表达和亲和柱层析法纯化的OmpR蛋白,经SDS-PAGE电泳分析表明 ompR 基因得到成功表达和纯化。

本文引用格式

孙冰冰 , 张伟 , 段红英 , 李伟 , 田涛 , 张力群 . 生防荧光假单胞菌2P24中EnvZ/OmpR双因子系统克隆与OmpR原核表达[J]. 华北农学报, 2014 , 29(3) : 41 -45 . DOI: 10.7668/hbnxb.2014.03.009

Abstract

Using the colour of colony as the selective marker, the random mutagenesis of mini-Tn5 was performed to wild-type biocontrol strain Pseudomonas fluorescens 2P24 for the screening of mutants, which might have altered yields of polyketide metabolite 2, 4-diacetylphloroglucinol(2, 4-DAPG).The strain Sesu-25 with a increased yield of 2, 4-DAPG was screened from the mutant pool.The analysis of flank sequence of transposon implied that the response regulator OmpR of EnvZ/OmpR two-component regulatory system(TCS) was disrupted in mutant strain Sesu-25.A DNA fragment harbouring a intact EnvZ/OmpR TCS was obtained by subcloning.The envZ and ompR of P.fluorescens 2P24 shared a identity of 93% and 96% with P.fluorescens F113, respectively.The ompR was ligated into the expression vector pET-22b(+) to obtain the recombinated plasmid pET-ompR, and the plasmid pET-ompR was transformed into E.coli BL21 to generate the strain BL21-ompR.The His-taged OmpR was purified by affinity chromatography and verified by SDS-PAGE electrophoresis analysis.

参考文献

[1] Zhou H Y,Wei H L,Liu X L,et al.Improving biocontrol activity of Pseudomonas fluorescens through chromosomal inte-gration of 2,4-diacetylphloroglucinol biosynthesis genes[J].Chinese Science Bulletin,2005,50(8):775-781.
[2] 魏海雷,王 烨,张力群,等.生防菌株2P24与CPF-10的鉴定及其生防相关性状的初步分析[J].植物病理学报,2004,34(1):80-85.
[3] Tian T,Wu X G,Duan H M, et al.The resistance-nodulation-division efflux pump EmhABC influences the production of 2,4-diacetylphloroglucinol in Pseudomonas fluorescens 2P24[J].Microbiology-GSM,2010,156(1):39-48.
[4] Bang I S,Audia J P,Park Y K,et al.Autoinduction of the ompR response regulator by acid shock and control of the Salmonella enterica acid tolerance response[J].Molecular Microbiology,2002,44(5):1 235-1 250.
[5] 董洪燕,彭大新,焦新安,等.肠炎沙门氏菌鸡源株 ompR 基因缺失株的构建及生物学特性与亲本株的比较[J].微生物学报,2011,51(9):1256-1262.
[6] Dekkers L C,Bloemendaal C P,De Weger L A,et al.A two-co mponent system plays an important role in the root-colonizing ability o f Pseudomonas fluorescens strain WCS365 [J].Molecular Plant-Microbe Interactions,1998,11(1):45-5 6.
[7] Jubelin G,Vianney A,Beloin C,et al.CpxR/OmpR interplay regulates curli gene expression in response to osmolarity in Escherichia coli [J]. Journal of Bacteriology,2005,187(6):2038-2049.
[8] Garmendia J,Beuzon C R,Ruiz-Albert J,et al.The roles of SsrA SsrB and OmpR EnvZ in the regulation of genes encoding the Salmonella typhimurium SPI-2 type III secretion system[J].Microbiology-GSM,2003,149(9):2385-2396.
[9] McCarthy C N,Woods R G,Beacham I R.Regulation of the aprX-lipA operon of Pseudomonas fluorescens B52:Dierential regulation of the proximal and distal genes,encoding protease and lipase,by ompR-envZ[J].FEMS Microbiology Letters,2004,241:243-248.
[10] Bangera M G,Thomashow L S.Identification and characterization of a gene cluster fo rsynthesis of the polyketide antibiotic 2,4-diacetylphloroglucinol from Pseudomonas fluorescens Q2¨C87[J].J Bacteriol,1999,181:3155-3163.
[11] 田 涛,孙淑琴,杨秀荣,等.植物病害生防细菌的筛选策略综述[J].天津农业科学,2012,18(5):162-165.
[12] 岳东霞,张要武,刘玉凤.黄瓜内生枯草芽孢杆菌B10抗菌活性物质稳定性研究[J].天津农业科学,2012,18(4):4-6.
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