畜牧兽医学报 ›› 2015, Vol. 46 ›› Issue (5): 868-872.doi: 10.11843/j.issn.0366-6964.2015.05.026

• 研究简报 • 上一篇    

霍乱弧菌DncV蛋白的原核表达及活性分析

韩莹倩,孔江南,王江,张超,杨国宇*   

  1. (河南农业大学农业部动物生化与营养重点开放实验室,郑州 450002)
  • 收稿日期:2014-09-09 出版日期:2015-05-23 发布日期:2015-05-23
  • 通讯作者: 杨国宇,教授,博士生导师,E-mail:haubiochem@163.com
  • 作者简介:韩莹倩(1990-),女,蒙古族,内蒙古呼伦贝尔人,硕士生,主要从事动物生物技术研究,E-mail:twgjl@163.com
  • 基金资助:

    农业部948重点计划(2011-G35);河南省重点科技攻关(112102310705)

Prokaryotic Expression and Activity Analysis of DncV from Vibrio Cholera

HAN Ying-qian,KONG Jiang-nan,WANG Jiang,ZHANG Chao,YANG Guo-yu*   

  1. (Key Laboratory of Animal Biochemistry and Nutrition,Ministry of Agriculture,Henan Agricultural University,Zhengzhou 450002,China)
  • Received:2014-09-09 Online:2015-05-23 Published:2015-05-23

摘要:

DncV(VC0179)是在霍乱弧菌中发现的一种双核苷酸环化酶,其可以合成c-di-AMP、c-di-GMP和c-GAMP。研究发现c-di-GMP作为胞内的第二信使,通过STING信号通路激活先天性免疫应答。为了体外制备c-di-GMP用于深入研究其功能,构建了VC0179融合cherry标签的丙酸诱导型表达载体,并将该重组表达载体转化至大肠杆菌BL21(DE3)中。利用丙酸钠诱导表达后,观察菌体颜色是否为红色判断融合蛋白质的表达。超声破碎细菌后经SDS-PAGE电泳检测融合蛋白质的可溶性表达。最后通过Ni-NTA Agarose亲和纯化重组蛋白质,获得的重组蛋白质进行体外酶促反应,高效液相色谱检测合成产物c-di-GMP。结果表明:成功构建VC0179丙酸诱导型原核表达载体并获得了高纯度的VC0179重组蛋白质。该重组蛋白质通过体外酶促反应可一步生成c-di-GMP。本试验建立了稳定获得具有酶活性的VC0179重组蛋白质的方法;c-di-GMP的体外合成为其后续功能研究及大量制备奠定基础。

Abstract:

DncV(VC0179) is the member of a new family of di-nucleotide cyclases in Vibrio cholera and it can catalyzes the synthesis of c-di-AMP,c-di-GMP and c-GAMP.c-di-GMP serves as the second messenger molecule to activate the innate immunity through STING signaling pathway.To generate c-di-GMP in vitro and further investigate its functions,we constructed the propionate-inducible VC0179 prokaryotic expression plasmid fused with cherry-Tag.The recombinant plasmid was transformed into E.coil BL21(DE3) and induced by propionate.The expression of recombinant protein was observed by red color.SDS-PAGE analysis was used to identify the soluble expression of recombinant protein after ultrasonic decomposition.Moreover,c-di-GMP was enzymatically synthesized in vitro with the recombinant protein purified by Ni-NTA purification system and detected by high performance liquid chromatography.We successfully constructed the propionate-inducible VC0179 prokaryotic expression plasmid and acquired the high quality fusion protein,which could catalyze the synthesis of c-di-GMP in vitro by a one-step process.These results suggested that we established a method to generate enzymatically active VC0179 recombinant protein.The synthesis of c-di-GMP in vitro could facilitate the functional study and high volume production of c-di-GMP.

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