Cyt1A Mutant Polypeptides for Broad-Spectrum Insect Control
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Solution Overview
Problem
Current genetically engineered crops provide limited resistance to a narrow range of insect pests, and there is a need for biopesticides with broader insecticidal activity and reduced hemolytic activity.
Innovation Solution
Development of nucleic acid molecules encoding Cyt1A variant polypeptides with enhanced pesticidal activity and reduced hemolytic activity, which are used to transform microorganisms and plants to produce transgenic plants with increased insect resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If broad-spectrum chemical insecticides are used to control insect pests, then insecticidal activity is improved, but environmental hazards and pollution increase
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the Cyt1A polypeptide through site-directed mutagenesis. Specific amino acid residues are substituted to alter the protein's properties, enhancing insecticidal activity while reducing hemolytic activity. This molecular-level parameter change enables the biopesticide to achieve broader insecticidal spectrum and reduced environmental harm compared to traditional chemical insecticides.
Solution Approach 2:
The patent creates a composite solution by combining the mutated Cyt1A polypeptide with other pesticidal proteins or formulations. The engineered polypeptide works synergistically with complementary agents to broaden the spectrum of insect control while maintaining environmental safety. This composite approach allows targeting multiple insect orders simultaneously without the harsh effects of broad-spectrum chemical insecticides.
2Reliability
If Cyt1A polypeptide is used for insect control, then pesticidal activity is achieved, but hemolytic activity causes harmful effects
Solution Approach 1:
The patent directly applies parameter changes by performing site-directed mutagenesis on the Cyt1A gene to substitute specific amino acid residues. These mutations alter the polypeptide's structural and functional parameters, specifically reducing its hemolytic activity while preserving or enhancing its insecticidal activity. The modified polypeptide maintains pesticidal efficacy against target insects but exhibits significantly reduced harmful hemolytic effects on non-target organisms.
Solution Approach 2:
The patent converts the harmful hemolytic property of the original Cyt1A polypeptide into a beneficial characteristic by engineering mutations that selectively eliminate this harmful function. The mutated polypeptide retains the desired pesticidal activity against insects while the hemolytic activity is reduced or eliminated, effectively transforming a harmful agent into a safer biopesticide.
3Reliability
If genetically engineered crops with existing pesticidal proteins are deployed, then insect resistance is improved, but the range of controlled insect pests remains narrow
Solution Approach 1:
The patent achieves universality by engineering the Cyt1A polypeptide to function against multiple insect orders simultaneously. The mutated polypeptide maintains activity against Lepidoptera while gaining enhanced activity against Diptera and Coleoptera. This multi-functional capability allows a single biopesticide formulation to control diverse pest species across different taxonomic groups, overcoming the narrow spectrum limitation of current genetically engineered crops.
Solution Approach 2:
The patent creates a composite pesticidal formulation that combines the mutated Cyt1A polypeptide with other pesticidal proteins having complementary activity profiles. This composite approach enables control of a broader spectrum of insect pests by leveraging the synergistic effects of multiple proteins, each targeting different insect orders or life stages, thereby expanding the versatility beyond what single-protein genetically engineered crops can achieve.
Data Source
AI summary
The disclosure provides nucleic acids encoding variant polypeptides having pesticidal activity against insect pests, including Lepidoptera and Diptera. Particular embodiments provide isolated nucleic acids encoding Cyt1A variant polypeptides, 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, particularly Diptera pests.