Av3 Mutant Insecticidal Polypeptides Yeast Expression Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current insecticidal polypeptides face challenges such as delicacy, low toxicity, high production costs, rapid degradation, and loss of toxicity when expressed in genetically modified organisms, leading to limited commercial success and effectiveness against insect vectors that transmit diseases.
Innovation Solution
Development of an Av3 variant polypeptide (AVP) with specific mutations, such as an N-terminal Arginine to Lysine substitution and C-terminal valine deletion, which is expressed in yeast and formulated into compositions for insect control, offering improved stability and efficacy against mosquito populations with a knockdown concentration of less than 100 ppm at 3-hours post-application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current insecticidal polypeptides are used, then insect control function is provided, but they suffer from delicacy, low toxicity, and rapid degradation
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of the Av3 polypeptide through specific mutations (R1K substitution and C-terminal valine deletion). These parameter changes in the molecular structure improve both the stability and insecticidal activity of the polypeptide, resolving the contradiction between reliability and compositional stability.
2Productivity
If insecticidal polypeptides are produced commercially, then insect control is achieved, but production costs are high and yields are low
Solution Approach 1:
The patent modifies production parameters by changing the expression system to yeast and optimizing cultivation conditions. The mutated Av3 polypeptide (AVP) shows improved expression levels and stability in yeast systems, leading to higher production yields and reduced manufacturing costs compared to previous systems.
3Ease of operation
If insecticidal polypeptides are expressed in genetically modified organisms, then delivery is improved, but toxicity is lost
Solution Approach 1:
The patent applies parameter changes to the polypeptide structure through specific mutations that enhance its stability in genetically modified organism expression systems. The R1K substitution and C-terminal valine deletion prevent degradation and maintain toxicity, allowing successful delivery via GMOs without loss of insecticidal activity.
Solution Approach 2:
The patent creates a modified copy of the original Av3 polypeptide with specific amino acid changes. This copied and improved version (AVP) maintains the essential toxic function while gaining enhanced stability for GMO expression, resolving the contradiction between delivery efficiency and toxicity retention.
4Reliability
If existing insecticides are used, then insect pest control is achieved, but insect resistance develops
Solution Approach 1:
The patent changes the molecular parameters of the insecticidal agent by introducing specific mutations in the Av3 polypeptide sequence. These parameter changes create a novel insecticide with different binding characteristics to insect sodium channels, effectively overcoming resistance developed against conventional insecticides while maintaining control effectiveness.
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 AVP compositions demonstrate enhanced insecticidal activity, achieving a 50% knockdown of mosquito populations within 3 hours and maintaining stability during production and application, addressing the limitations of existing insecticidal polypeptides.
Implementation Method 1
Development of an Av3 variant polypeptide (AVP) with specific mutations, such as an N-terminal Arginine to Lysine substitution and C-terminal valine deletion, which is expressed in yeast
Data Source
AI summary
New insecticidal proteins, nucleotides, peptides, their expression in plants, methods of producing the peptides, new processes, production techniques, new peptides, new formulations, and new organisms, a process which increases the insecticidal peptide production yield from yeast expression systems. The present disclosure is also related and discloses toxins called AVPs, which are modified from the Av3 toxin derived from sea anemone; here we describe the genes encoding the new polypeptide, as well various formulations and combinations; of both genes and peptides, useful for the control of insects.