Directed evolution of the Bacillus thuringiensis insecticidal toxin for the creation of proteinaceous insecticide.
苏云金芽孢杆菌杀虫毒素的定向进化,用于制造蛋白质杀虫剂。
基本信息
- 批准号:15380228
- 负责人:
- 金额:$ 8.96万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2003
- 资助国家:日本
- 起止时间:2003 至 2004
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In AB-type toxins, which consist of active and binding domains, activity should theoretically be improved if binding affinity to the receptor is improved. The insecticidal toxins (Cry toxins) from B.thuringiensis are AB-type toxins that have been used as organic insecticides and as sources for the development of transgenic plants. In the present report, we describe a method for directed evolution of Cry toxin. This method can be used to increase the binding affinity of Cry toxins for their receptors in target insect pests. Using a commercial T7 phage-display system, we expressed Cry1Aa toxin on the phage surface as fusions with the capsid protein 10B. These recombinant phages bound to a cadherin-like protein that is one of the Cry1Aa toxin receptors in the model target insect Bombyx mori. The affinity of Cry1Aa-expressing phage for the receptor was higher than that of Cry1Ab-expressing phage. Toxin-expressing phages were effectively isolated from T7 wild-type phages using magnetic beads coated with cadherin-like protein. Phages expressing Cry1Aa were isolated from a mixed suspension of phages expressing Cry1Ab and concentrated by up to 1.3 x 10^<5->fold. Finally, random mutations were made in amino acid residues 369-375 in domain 2 of Cry1Aa toxin, the mutant toxins were expressed on phages, and the resulting phage library was screened five times with cadherin-like protein-coated beads. As a result, phages expressing abnormal or low-affinity mutant toxins were excluded, and phages with high-affinity mutant toxins were selected. The insecticidal activity of one of these toxins against B.mori was increased four-fold over that of wild-type Cry1Aa toxin. These results indicate that a method combining T7 phage display with selection using cadherin-like protein-coated magnetic beads can be used to increase the activity of easily obtained, low-activity Cry toxins from bacteria.
AB型毒素由活性结构域和结合结构域组成,理论上,如果与受体的结合亲和力提高,活性就会提高。苏云金芽胞杆菌的杀虫毒素(Cry 毒素)是 AB 型毒素,已被用作有机杀虫剂和转基因植物开发的来源。在本报告中,我们描述了一种 Cry 毒素定向进化的方法。该方法可用于增加 Cry 毒素与其目标害虫受体的结合亲和力。使用商业 T7 噬菌体展示系统,我们在噬菌体表面表达 Cry1Aa 毒素,与衣壳蛋白 10B 融合。这些重组噬菌体与钙粘蛋白样蛋白结合,该蛋白是模型目标昆虫家蚕中的 Cry1Aa 毒素受体之一。表达Cry1Aa的噬菌体对受体的亲和力高于表达Cry1Ab的噬菌体。使用钙粘蛋白样蛋白包被的磁珠从 T7 野生型噬菌体中有效分离表达毒素的噬菌体。从表达Cry1Ab的噬菌体的混合悬浮液中分离表达Cry1Aa的噬菌体并浓缩至多1.3×10 5 倍。最后,对Cry1Aa毒素结构域2的氨基酸残基369-375进行随机突变,突变毒素在噬菌体上表达,所得噬菌体文库用钙粘蛋白样蛋白包被珠筛选五次。结果,表达异常或低亲和力突变毒素的噬菌体被排除,并选择具有高亲和力突变毒素的噬菌体。其中一种毒素对家蚕的杀虫活性比野生型 Cry1Aa 毒素增加了四倍。这些结果表明,将 T7 噬菌体展示与使用钙粘蛋白样蛋白包被磁珠进行选择相结合的方法可用于提高从细菌中容易获得的低活性 Cry 毒素的活性。
项目成果
期刊论文数量(5)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Location of the Bombyx mori aminopeptidase N type l binding site on a Bacillus thuringiensis CrylAa toxin.
苏云金芽孢杆菌 CrylAa 毒素上的家蚕氨肽酶 N I 型结合位点的位置。
- DOI:
- 发表时间:2005
- 期刊:
- 影响因子:0
- 作者:S.Atsumi他 8名
- 通讯作者:S.Atsumi他 8名
Location of the Bombyx mori Aminopeptidase N type 1 binding site on a Bacillus thuringiensis Cry1Aa toxin.
苏云金芽孢杆菌 Cry1Aa 毒素上家蚕氨基肽酶 N 1 型结合位点的位置。
- DOI:
- 发表时间:2005
- 期刊:
- 影响因子:0
- 作者:Shogo Atsumi;Eri Mizuno;Hirotaka Hara;Kazuko Nakanishi;Madoka Kitami;Nami Miura;Hiroko Tabunoki;Ayako Watanabe;Ryoichi Sato
- 通讯作者:Ryoichi Sato
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SATO Ryoichi其他文献
Approximate Analysis of EM Wave Scattering From Two Cracks on a Ground Plane
地平面上两个裂纹的电磁波散射的近似分析
- DOI:
- 发表时间:
2021 - 期刊:
- 影响因子:0
- 作者:
SATO Ryoichi;SHIRAI Hiroshi - 通讯作者:
SHIRAI Hiroshi
SATO Ryoichi的其他文献
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{{ truncateString('SATO Ryoichi', 18)}}的其他基金
Evolvement of "durability mechanics" for the evaluation of shrinkage effect on performance of reinforced concrete beams
用于评估收缩对钢筋混凝土梁性能影响的“耐久性力学”的演变
- 批准号:
24246077 - 财政年份:2012
- 资助金额:
$ 8.96万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
DEVELOPMENT OF A PRACTICAL TENSILE CREEP MODEL BASED ON SIMPLE EXPERIMENTS
基于简单实验的实用拉伸蠕变模型的开发
- 批准号:
24656272 - 财政年份:2012
- 资助金额:
$ 8.96万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
Generation of a new category, "Proteinaceous Insecticide" based on mechanisms which cause specificity diversity of Bacillus thuringiensis insecticidal protein.
基于苏云金芽孢杆菌杀虫蛋白特异性多样性的机制,产生了一个新类别“蛋白质杀虫剂”。
- 批准号:
24310054 - 财政年份:2012
- 资助金额:
$ 8.96万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of Accurate Detection/Identification Method of Stricken Residential Buildings Using Radar Porlarimetry
雷达偏振测量受灾住宅精确检测/识别方法的研制
- 批准号:
22510188 - 财政年份:2010
- 资助金额:
$ 8.96万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Realization of a secure and safe proteinaceous-insecticide based on the directed evolution of the insecticidal toxin from soil bacterium, Bacillus thuringiensis
基于土壤细菌苏云金芽孢杆菌杀虫毒素的定向进化,实现安全可靠的蛋白质杀虫剂
- 批准号:
21310051 - 财政年份:2009
- 资助金额:
$ 8.96万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Durability Mechanics for High Shrinkage Concrete Members
高收缩混凝土构件的耐久性力学
- 批准号:
21246071 - 财政年份:2009
- 资助金额:
$ 8.96万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Detection and Classification of Landslide and/or Stricken Residential Area in Mountainous Region Using Radar Polarimetry
利用雷达旋光法对山区滑坡和/或受灾住宅区进行检测和分类
- 批准号:
19510183 - 财政年份:2007
- 资助金额:
$ 8.96万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Development of Expansive-High Strength Concrete and Systematic Evaluation of Structural Behavior of Reinforced Concrete Beams
膨胀高强混凝土的开发及钢筋混凝土梁结构性能的系统评价
- 批准号:
16360220 - 财政年份:2004
- 资助金额:
$ 8.96万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Approach for creation of proteinaceous insecticide from Bacilhus thuringiensis delta-endotoxin by directed evolution using phage display system
利用噬菌体展示系统定向进化从苏云金芽孢杆菌δ-内毒素中制备蛋白质杀虫剂的方法
- 批准号:
12558068 - 财政年份:2000
- 资助金额:
$ 8.96万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Research for a basic anti-microbial recognition system of the animal using silkworm, Bombyx mori
家蚕动物基本抗菌识别系统的研究
- 批准号:
10680601 - 财政年份:1998
- 资助金额:
$ 8.96万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
相似海外基金
Channel-pores formed by Bacillus thuringiensis Cry46Ab toxin and synergistic interaction with other mosquitocidal Cry toxins.
苏云金芽孢杆菌 Cry46Ab 毒素形成的通道孔以及与其他杀蚊 Cry 毒素的协同相互作用。
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15H02837 - 财政年份:2015
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殺虫タンパク質の昆虫特異的な毒性を決定する受容体の解明とタンパク質工学への応用
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- 批准号:
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利用苏云金芽孢杆菌 Cry 毒素开发新型灭蚊系统
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