Anti-Cry1C Toxin Idiotype Antibody E8 for Safer Pest Control
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Solution Overview
Problem
The extensive use of transgenic Bt toxin crops poses potential safety hazards, hypersensitivity, and ecological concerns due to their toxicity and immunosuppressive effects, necessitating the development of alternative biological control agents with similar bioactivity.
Innovation Solution
A human-derived insect-resistant gene encoding an anti-Cry1C toxin idiotype single-chain antibody (E8) is developed, which is expressed using a prokaryotic system and demonstrated to have insecticidal activity against agricultural pests, offering a potential substitute for Bt toxins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Bt toxin gene is widely used for biological control of pests, then insecticidal effectiveness is improved, but safety hazards and immunosuppressive effects increase
Solution Approach 1:
The patent creates a copy of the Bt toxin's binding function through an anti-idiotype antibody (E8) that mimics the toxin's interaction with insect receptors. This antibody copy binds to the same receptors (BBMV) as the Bt toxin, providing similar insecticidal activity without producing the harmful toxins themselves, thus resolving the contradiction between effectiveness and safety
Solution Approach 2:
The anti-idiotype antibody E8 serves as an intermediary substance that transfers the insecticidal function from the Bt toxin to a safer biological agent. It mediates the killing effect by binding to insect midgut receptors, eliminating the need for direct Bt toxin application and its associated immunosuppressive effects
2Adaptability or versatility
If transgenic Bt crops are extensively planted, then pest control coverage is improved, but ecological structure and soil bacterial diversity are harmed
Solution Approach 1:
The patent extracts the essential insecticidal function from the Bt toxin system and separates it from the harmful ecological impacts. By using the anti-idiotype antibody E8, the invention takes out only the useful binding activity against insect receptors while eliminating the harmful effects on soil bacteria and ecological structure associated with Bt toxin production and application
3Reliability
If Bt toxin protein is administered at high doses, then insecticidal activity is improved, but immunosuppression and organ injury increase
Solution Approach 1:
The patent employs a soluble, easily degradable antibody protein (E8) that performs its function and is then rapidly degraded by proteases in the insect gut. This disposable-like characteristic allows high effectiveness without accumulation toxicity, as the antibody is quickly broken down unlike persistent Bt crystal proteins that cause long-term immunosuppression and organ damage
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 anti-Cry1C toxin idiotype single-chain antibody E8 exhibits binding activity to specific receptors in insect midguts, providing a safer and more targeted insecticidal effect, suitable for in vitro mass production and reducing the risks associated with Bt toxin use.
Implementation Method 1
The anti-Cry1C toxin idiotype single-chain antibody E8 exhibits binding activity to specific receptors in insect midguts
Data Source
AI summary
An anthropogenic insect-resistant gene having a nucleotide sequence represented by SEQ ID NO.1, and a Cry1C toxin idiotype single-chain antibody encoded by said anthropogenic insect-resistant gene and having an amino acid sequence represented by SEQ ID NO.2; the antibody is a β-type and has insecticidal activity, and after expression by the prokaryotic system, the primary culture thereof has binding activity to Cnaphalocrocis medinalis midgut peritrophic membrane specific receptor BBMV; the β-type Cry1C toxin idiotype single-chain antibody of the present invention is obtained without animal immunization, has a short preparation period and small amino acid sequence, and is suitable for large-scale in vitro production. The present invention is an entirely new insect-resistant gene resource, and has significant implications for decreasing the various safety risks associated with the widescale use of existing Bt toxins, substituting Bt toxins in the biocontrol of agricultural pests, and reducing the use of pesticides.