华北农学报 ›› 2012, Vol. 27 ›› Issue (6): 48-52. doi: 10.3969/j.issn.1000-7091.2012.06.011

• 论文 • 上一篇    下一篇

苏云金杆菌cry8Ea2蛋白的分离纯化及生物活性测定

王伟1, 郭巍1,2,3, 徐大庆1, 孙伟明2, 刘大群2, 李瑞军2   

  1. 1. 河北农业大学生命科学学院, 河北保定 071001;
    2. 河北农业大学植物保护学院, 河北省农作物病虫害生物防治工程技术中心, 河北保定 071001;
    3. 国家北方山区农业工程技术研究中心, 河北保定 071001
  • 收稿日期:2012-08-08 出版日期:2012-12-28
  • 作者简介:王伟(1985-),男,河北邢台人,在读硕士,主要从事基因工程方面研究。
  • 基金资助:
    国家现代农业(花生)产业技术体系项目;"973"计划项目(2009CB118902)

Separation,Purification and Insecticidal Activity of cry8Ea2 Protein from Bacillus thuringiensis

WANG Wei1, GUO Wei1,2,3, XU Da-qing1, SUN Wei-ming2, LIU Da-qun2, LI Rui-jun2   

  1. 1. College of Life Sciences, Agricultural University of Hebei, Baoding 071001, China;
    2. College of Plant Protection, Agricultural University of Hebei, Biological Control Center of Plant Diseases and Plant Pests of Hebei Province, Baoding 071001, China;
    3. National Engineering Research Center for Agriculture in Northern Mountainous Areas, Baoding 071001, China
  • Received:2012-08-08 Published:2012-12-28

摘要: cry8Ea2蛋白是一种新型苏云金杆菌杀虫晶体蛋白。通过穿梭载体pSXY422b将cry8Ea2导入Bt无晶体突变菌株中,获得工程菌HD8Ea2。cry8Ea2蛋白在工程菌中获得表达。通过分子筛层析,成功获得纯化的130 kDa活性毒素蛋白。用改进的生物活性测定方法进行cry8Ea2蛋白对华北大黑鳃金龟和暗黑鳃金龟一龄幼虫的杀虫活性测定,LC50分别为0.267 9μg/mL和0.071 9μg/mL。研究首次发现cry8Ea2蛋白对华北大黑鳃金龟具有较高毒力,拓展了该蛋白的杀虫谱,为转基因工程提供了新资源。

关键词: 苏云金杆菌, cry8, 穿梭载体, 蛋白纯化, 生物活性测定

Abstract: cry8Ea2 protein is a kind of insecticidal crystal protein of Bacillus thuringiensis. In this study, cry8Ea2 was cloned into E. coli-B. thuringiensist shuttle vector pSXY422b, resulting from recombinant pScry8Ea2, and pScry8Ea2 was transformed into the Bt,acrystalliferous mutant generating HD8Ea2 engineering strain. cry8Ea2 protein was successfully expressed in HD8Ea2 stain. By anion exchange chromatography on molecular sieve chromatography, 1 30 kDa of toxin protein cry8Ea2 was purified. The activities of the cry8Ea2 toxin were evaluated by improved bioassays,and the LC50value to neonates of Holotrichia oblita and Holotrichia paralella was 0. 267 9 μg /mL and 0. 071 9 μg /mL, respectively. Insecticidal activity of cry8Ea2 to Holotrichia oblita was firstly reported in this study,which will broaden the protein insecticidal spectrum and provide new resources for genetically modified project.

Key words: Bacillus thuringiensisis, cry8, Shuttle vector, Protein purification, Bioassays

中图分类号: 

引用本文

王伟, 郭巍, 徐大庆, 孙伟明, 刘大群, 李瑞军. 苏云金杆菌cry8Ea2蛋白的分离纯化及生物活性测定[J]. 华北农学报, 2012, 27(6): 48-52. doi: 10.3969/j.issn.1000-7091.2012.06.011.

WANG Wei, GUO Wei, XU Da-qing, SUN Wei-ming, LIU Da-qun, LI Rui-jun. Separation,Purification and Insecticidal Activity of cry8Ea2 Protein from Bacillus thuringiensis[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2012, 27(6): 48-52. doi: 10.3969/j.issn.1000-7091.2012.06.011.