Alcaligenes Insecticidal Proteins Broaden Pest Control Spectrum
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Solution Overview
Problem
Current genetically engineered crops resistant to insect pests have limited efficacy against a narrow range of insects and may face resistance issues, necessitating the development of new pesticidal proteins with broader insecticidal activity.
Innovation Solution
The development of recombinant nucleic acid molecules encoding Alcaligenes Insecticidal Protein-1A (AfIP-1A) and Alcaligenes Insecticidal Protein-1B (AfIP-1B) polypeptides, which can be expressed in bacteria and plants to confer resistance against Lepidopteran, Coleopteran, nematode, fungi, Hemipteran, and Dipteran pests, along with methods for detecting these proteins and using them in transgenic plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If genetically engineered crops produce pesticidal proteins from Bacillus, then insect resistance is enhanced, but the range of insecticidal activity remains narrow
Solution Approach 1:
The patent introduces Alcaligenes faecalis pesticidal proteins (AfIP-1A and AfIP-1B) that provide multi-functional insecticidal activity against diverse insect orders including Lepidoptera, Coleoptera, Diptera, Hemiptera, and nematodes. This expands the universality of crop protection beyond the narrow spectrum of existing Bt proteins, allowing a single transgenic crop to defend against multiple pest types simultaneously.
Solution Approach 2:
The patent combines Alcaligenes faecalis pesticidal proteins with existing Bacillus thuringiensis proteins in composite expression systems. This creates a synergistic effect where the AfIP proteins complement Bt proteins to broaden the overall insecticidal spectrum while maintaining high reliability against both susceptible and resistant insect populations.
2Productivity
If existing insecticides are used, then control of susceptible insects is effective, but resistance develops in insect populations
Solution Approach 1:
The patent converts the harmful effect of insect resistance into a benefit by introducing AfIP proteins that target novel insecticidal pathways. Since insects have not been exposed to Alcaligenes-derived toxins, their existing resistance mechanisms to Bt proteins remain ineffective, thereby converting the problem of resistance into an opportunity for restored control efficacy.
Solution Approach 2:
Instead of trying to overcome insect resistance to Bt proteins by modifying Bt proteins further, the patent inverts the approach by introducing a completely different pesticidal protein family from Alcaligenes faecalis. This reversal of strategy bypasses the resistance problem entirely by attacking insects through a novel biochemical pathway they have not adapted to.
3Adaptability or versatility
If broader spectrum pesticidal proteins are developed, then insect control range is expanded, but detection and characterization becomes more complex
Solution Approach 1:
The patent employs fluorescently labeled antibodies specific to AfIP-1A and AfIP-1B proteins for detection. The fluorescent tags produce distinct color signals that enable easy differentiation and quantification of these proteins in complex plant extracts, simplifying the detection process despite the broad spectrum of pesticidal activity.
Solution Approach 2:
The patent creates simplified detection models using recombinant AfIP proteins expressed in bacterial systems. These purified copies serve as standards for ELISA and Western blot assays, enabling accurate detection and characterization of the proteins in transgenic crops without requiring complex analysis of the full protein mixture.
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 including plants, as probes for the isolation of other homologous (or partially homologous) genes. The pesticidal 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.