Bacillus thuringiensis Cry9 Toxins for Broad-Spectrum Pest Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for controlling insect pests in agriculture rely heavily on broad-spectrum chemical insecticides, which pose environmental hazards and have limited effectiveness against a broad range of insect pests, necessitating the development of alternative, environmentally friendly solutions with broader insecticidal activity.
Innovation Solution
The use of nucleic acids encoding δ-endotoxin genes from Bacillus thuringiensis, specifically novel members of the Cry9 family, to produce transformed microorganisms and plants that express pesticidal polypeptides, providing enhanced insecticidal activity against a variety of Lepidopteran pests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If broad-spectrum chemical insecticides are used to control insect pests, then pest control effectiveness is improved, but environmental hazards increase
Solution Approach 1:
The patent utilizes naturally occurring Bacillus thuringiensis δ-endotoxins, which are biodegradable and environmentally benign substances, to achieve effective pest control. The toxin is produced by a beneficial bacterium and targets specific insect pests without harming the environment, thus converting a natural biological substance into a beneficial pest control agent that eliminates the need for harmful chemical insecticides
Solution Approach 2:
The patent replaces chemical insecticide systems with a biological control system based on Bacillus thuringiensis δ-endotoxins. This substitution uses a natural biological mechanism (toxin production by bacteria) to achieve pest control, replacing the mechanical/chemical approach with a biologically-based solution that is both effective and environmentally friendly
2Reliability
If genetically engineered crops producing Bacillus δ-endotoxins are used, then insect resistance is improved, but the range of effective insect pests controlled is limited
Solution Approach 1:
The patent employs δ-endotoxins from Bacillus thuringiensis that exhibit broad-spectrum activity against multiple insect orders including Lepidoptera, Diptera, Coleoptera, and Hemiptera. This single biological agent performs multiple pest control functions across different insect groups, making the solution universally applicable to a wide range of agricultural pests rather than being limited to a single pest species
Solution Approach 2:
The patent utilizes the natural variability and diversity of Bacillus thuringiensis strains, each producing δ-endotoxins with slightly different properties and spectra of activity. By leveraging this natural parameter diversity among different bacterial strains and toxin variants, the solution achieves broad adaptability across multiple insect pest types while maintaining high reliability for each target group
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The approach offers a broader range of insecticidal activity and improved pest control efficacy with reduced environmental impact, as the transformed plants and microorganisms produce biologically active polypeptides that effectively target multiple insect pests, reducing the need for chemical insecticides.
Implementation Method 1
The activated toxin binds to protein receptors on brush-border membrane vesicles. The epithelial cells lining the midgut are rapidly destroyed as a consequence of membrane perforation resulting from the formation of gated, cation-selective channels by the toxin.
Implementation Method 2
Upon being ingested by susceptible insect larvae, the microcrystals dissolve in the midgut, and the protoxin is transformed into a biologically active moiety by proteases characteristic of digestive enzymes located in the insect gut.
Data Source
AI summary
The invention provides Bacillus thuringiensis toxins having pesticidal activity against insect pests, including Lepidoptera. Particular embodiments of the invention provide isolated pesticidal proteins and pesticidal compositions. These compositions find use in methods for controlling pests, especially plant pests.