PHI-4 Polypeptides Broaden Insecticidal Activity
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Solution Overview
Problem
Current genetically engineered crops resistant to insect pests have limited efficacy against Coleoptera and pests that have developed resistance to existing pesticides, necessitating the development of new pesticidal proteins with broader insecticidal activity.
Innovation Solution
The development of novel PHI-4 polypeptides with enhanced insecticidal activity, including amino acid substitutions and modifications, for use in transgenic plants to confer resistance against Lepidopteran, Coleopteran, nematode, fungi, Hemipteran, and Dipteran pests, and the provision of methods for detecting these polypeptides and nucleic acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing pesticidal proteins from Bacillus strains are used in transgenic plants, then insect resistance is provided, but the range of insecticidal activity is limited to a narrow range of pests
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the pesticidal protein through substitutions, deletions, insertions, and truncations. These sequence variations alter the protein's properties to expand its insecticidal activity range against different pest orders including Coleoptera, Lepidoptera, Diptera, Hemiptera, and nematodes, while maintaining effectiveness against existing target pests
2Reliability
If genetically engineered crops are developed with enhanced insect resistance, then resistance to existing pesticides is improved, but insects can develop resistance to different insecticidal compounds
Solution Approach 1:
The patent creates a universal pesticidal protein system that performs multiple functions by targeting diverse insect orders through a single protein family. The modified PHI-4 polypeptides can effectively control Coleoptera, Lepidoptera, Diptera, Hemiptera, and nematode pests simultaneously, providing multi-functional pest resistance in transgenic plants and reducing the need for multiple specialized pesticides
3Adaptability or versatility
If new pesticidal proteins with broader insecticidal activity are developed, then activity against a variety of insects is improved, but the complexity of protein modification and characterization increases
Solution Approach 1:
The patent segments the complex protein modification process into discrete, manageable steps: (1) identifying key amino acid positions for modification, (2) introducing specific substitutions, deletions, insertions, or truncations at defined locations, (3) expressing the modified protein in host organisms, and (4) characterizing the protein's insecticidal activity. This systematic segmentation reduces the complexity of generating and validating broad-spectrum pesticidal proteins
Data Source
AI summary
Compositions and methods for controlling pests are provided. The methods involve transforming organisms with a nucleic acid sequence encoding an insecticidal protein. In particular, the nucleic acid sequences are useful for preparing plants and microorganisms that possess insecticidal activity. Thus, transformed bacteria, plants, plant cells, plant tissues and seeds are provided. Compositions are insecticidal nucleic acids and proteins of bacterial species. The sequences find use in the construction of expression vectors for subsequent transformation into organisms of interest, as probes for the isolation of other homologous (or partially homologous) genes. The insecticidal proteins find use in controlling, inhibiting growth or killing lepidopteran, coleopteran, dipteran, fungal, hemipteran, and nematode pest populations and for producing compositions with insecticidal activity.