Bacillus thuringiensis Nucleic Acids for Broad-Spectrum Lepidopteran Control
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Solution Overview
Problem
Current methods for controlling insect pests in agriculture rely heavily on chemical pesticides, which pose environmental hazards and have limited specificity, while genetically engineered crops provide only narrow resistance to certain pests, necessitating the development of broader-range biopesticides.
Innovation Solution
The use of nucleic acids encoding insecticidal peptides from novel Bacillus thuringiensis genes to produce transformed microorganisms and plants that express pesticidal polypeptides, offering enhanced insecticidal activity against a wider range of insect pests, including Lepidopterans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical insecticides are used to control insect pests, then pest control effectiveness is improved, but environmental hazards increase and target specificity decreases
Solution Approach 1:
The patent converts the harmful effects of broad-spectrum chemical insecticides into beneficial effects by using biopesticides that are naturally degraded by the environment. The Bacillus thuringiensis bacteria and their crystalline proteins provide effective pest control while being environmentally benign, breaking down naturally in the ecosystem without persistent pollution.
Solution Approach 2:
The patent changes the chemical composition parameter from synthetic broad-spectrum insecticides to biodegradable bacterial proteins. This parameter change maintains pest control effectiveness while improving environmental compatibility, as the protein toxins are naturally decomposed by microorganisms in the environment.
2Reliability
If genetically engineered crops are developed to provide insect resistance, then pest resistance is improved, but the range of effective pests is limited
Solution Approach 1:
The patent achieves multi-functionality by combining multiple Bacillus thuringiensis crystal proteins into a single biopesticide formulation. This combination provides activity against diverse insect orders including Lepidoptera, Diptera, Coleoptera, and Hemiptera, making the biopesticide universally effective across multiple pest types rather than being limited to a single crop or pest group.
Solution Approach 2:
The patent merges the pesticidal activities of different Bt crystal proteins (Cry1Ac, Cry2Ab, Cry3A, Cry4E, Cry6Ba) into a single biopesticide product. This combination synergistically expands the spectral activity against various insect pests while maintaining safety and effectiveness, overcoming the limitation of single-protein crops being effective against only narrow pest ranges.
3Object-affected harmful factors
If biopesticides are used to reduce environmental impact, then environmental safety is improved, but pest control specificity is reduced
Solution Approach 1:
The patent applies local quality by providing pest control specificity for particular insect orders through selected crystal protein combinations. The biopesticide formulation can be tailored to target specific pest groups (e.g., Lepidoptera, Diptera) by including appropriate crystal proteins, maintaining environmental safety while achieving high specificity for the intended target pests.
Data Source
AI summary
The invention provides nucleic acids, and variants and fragments thereof, obtained from strains of Bacillus thuringiensis encoding polypeptides having pesticidal activity against insect pests, including Lepidoptera. Particular embodiments of the invention provide isolated nucleic acids encoding pesticidal proteins, pesticidal compositions, DNA constructs, and transformed microorganisms and plants comprising a nucleic acid of the embodiments. These compositions find use in methods for controlling pests, especially plant pests.