苏云金芽胞杆菌Vip3Aa11蛋白C端点突变对其杀虫活性的影响

doi:10.16409/j.cnki.2095-039x.2018.01.009

中国生物防治学报 ›› 2018, Vol. 34 ›› Issue (1): 79-85.DOI: 10.16409/j.cnki.2095-039x.2018.01.009

苏云金芽胞杆菌Vip3Aa11蛋白C端点突变对其杀虫活性的影响

雒国兴¹, 刘荣梅¹, 李海涛^1,2, 张金波¹, 高继国¹, 张杰^1,2

1. 东北农业大学生命科学学院, 哈尔滨 150030;
2. 中国农业科学院植物保护研究所/植物病虫害生物学国家重点实验室, 北京 100193

收稿日期:2017-01-29 出版日期:2018-02-08 发布日期:2018-02-06
通讯作者: 张杰,研究员,E-mail:jzhang@ippcaas.cn
作者简介:雒国兴,硕士研究生,E-mail:15765534169@163.com
基金资助:
国家自然科学基金（31401812）；国家重点研发计划（2017YFD0201201）；黑龙江自然科学基金（C2016025）；植物病虫害生物学国家重点实验室开放基金（SKLOF201705）

The Influence of C-terminus Site-directed Mutation on the Toxicity of Bacillus thuringiensis Vip3Aa11 Protein

LUO Guoxing¹, LIU Rongmei¹, LI Haitao^1,2, ZHANG Jinbo¹, GAO Jiguo¹, ZHANG Jie^1,2

1. College of Life Sciences, Northeast Agricultural University, Harbin 150030, China;
2. State Key Laboratory for Biology of Plant Diseases and Insect Pests/Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China

Received:2017-01-29 Online:2018-02-08 Published:2018-02-06

摘要/Abstract

摘要： 为研究Vip3Aa11羧基端对其杀虫活性和敏感性的影响，本研究利用定点突变技术构建了Vip3Aa11的3个突变体S543N、D547E和T681V。经SDS-PAGE分析证实3个突变体蛋白均能在大肠杆菌中表达分子量约88 kD的目的蛋白，生物活性测定显示，与Vip3Aa11相比，突变体S543N对甜菜夜蛾Helicoverpa armigera的杀虫活性提高了5倍。突变体D547E对甜菜夜蛾杀虫活性显著降低。突变体S543N、D547E和T681V对棉铃虫Spodoptera exigua的杀虫活性无明显变化。说明Vip3Aa11 C端部分氨基酸的定点突变对其杀虫活性有影响，且对不同害虫的杀虫活性变化趋势不同。本研究比较了Vip3Aa11蛋白与突变蛋白之间杀虫活性的差异，为研究Vip3Aa类蛋白的结构和机理奠定基础。

关键词: 苏云金芽胞杆菌, 营养期杀虫蛋白, 定点突变, 活性分析

Abstract: Vegetative insecticidal proteins (VIPs) of Bacillus thuringiensis show a wide insecticidal spectrum against a wide variety of lepidopteran pests. The insecticidal activity and specificity of the Vip3Aa protein derived from different Bt strains are highly different, although the similarities between these proteins are higher than 95%. To determine whether the residues from the Vip3Aa11 C-terminus contribute to the insecticidal activity, three mutants (S543N, D547E and T681V) of Vip3Aa11 were constructed by site directed mutagenesis. Through SDS-PAGE, the mutants produced a 88 kD fusion protein, indicating that all mutants had successful expression in E. coli. Bioassay detection indicated that the insecticidal activity of the S543N mutant against Spodoptera exigua increased obviously, and the LC₅₀value was approximately 5-fold higher than that of the Vip3Aa11, while the activity of D547E mutant against S. exigua decreased obviously. The activities of all the mutants against Helicoverpa armigera had no obvious changes. The results indicated that the site directed mutagenesis of some amino acids from Vip3Aa11 C terminus had an effect on insecticidal activity, and the effect was not consistent against different Lepidopteran pests even in the same mutant. In this study, the differences of insecticidal activity between Vip3Aa11 and mutant proteins serve a guideline for the study of Vip3Aa protein structure and activity mechanism.

Key words: Bacillus thuringiensis, vegetative insecticidal proteins, site directed mutation, activity

中图分类号:

S476.12

雒国兴, 刘荣梅, 李海涛, 张金波, 高继国, 张杰. 苏云金芽胞杆菌Vip3Aa11蛋白C端点突变对其杀虫活性的影响[J]. 中国生物防治学报, 2018, 34(1): 79-85.

LUO Guoxing, LIU Rongmei, LI Haitao, ZHANG Jinbo, GAO Jiguo, ZHANG Jie. The Influence of C-terminus Site-directed Mutation on the Toxicity of Bacillus thuringiensis Vip3Aa11 Protein[J]. journal1, 2018, 34(1): 79-85.

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苏云金芽胞杆菌Vip3Aa11蛋白C端点突变对其杀虫活性的影响

The Influence of C-terminus Site-directed Mutation on the Toxicity of Bacillus thuringiensis Vip3Aa11 Protein

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