Modified DON-Degrading Polypeptide With Improved Thermal Stability
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Solution Overview
Problem
Current methods for detoxifying deoxynivalenol (DON) contamination in grains are inadequate due to high costs, safety concerns, and adverse effects on grain quality, necessitating a safe and effective method for DON degradation.
Innovation Solution
Development of a modified polypeptide with DON degradation activity, along with a polynucleotide encoding it, and a microorganism comprising the polypeptide, which can be used in feed additives to degrade DON.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical methods (ozone, ammonia, chlorine, hydrogen peroxide, sodium bisulfite) are used to detoxify DON, then DON degradation is achieved, but cost increases, safety concerns arise, and grain quality deteriorates
Solution Approach 1:
The patent modifies the amino acid sequence of the original polypeptide by substituting specific residues (e.g., F65M, R121I substitutions) to alter its thermal and catalytic properties. This enables the enzyme to function effectively at higher temperatures (50-60°C) while maintaining DON degradation activity, thereby achieving detoxification without the harmful side effects of chemical methods
Solution Approach 2:
The patent replaces chemical detoxification methods with a biological enzyme system. The modified polypeptide catalyzes the degradation of DON through enzymatic action, substituting the mechanical/chemical approach with a biological one that avoids the harmful effects of chemicals like ozone, ammonia, and chlorine on grain quality
2Reliability
If sodium metabisulfite is used to detoxify DON, then DON degradation is most effective, but safety concerns increase due to prohibition in Europe for food-use grains
Solution Approach 1:
The patent employs a biodegradable enzyme system that can be applied in small amounts and breaks down naturally after functioning. The modified polypeptide performs its detoxification role and then degrades, leaving no persistent harmful residues, making it safer than sodium metabisulfite for food-grade applications
Solution Approach 2:
The patent substitutes the chemical reducing agent sodium metabisulfite with a biological enzyme system. This replacement eliminates the safety concerns associated with sulfite residues while maintaining effective DON degradation through enzymatic catalysis
3Reliability
If conventional polypeptides are used for DON degradation, then DON detoxification is achieved, but thermal tolerance and stability are insufficient for industrial application
Solution Approach 1:
The patent systematically modifies multiple parameters of the polypeptide including amino acid substitutions at critical positions (F65M, R121I), N-terminal extensions, and C-terminal modifications. These changes collectively enhance the enzyme's thermal stability and tolerance, enabling it to maintain structural integrity and catalytic activity at industrial processing temperatures
Solution Approach 2:
The patent creates a composite structure by combining the core catalytic domain of the original polypeptide with additional stabilizing domains and modifications. This composite architecture provides both the necessary DON degradation activity and enhanced thermal stability for industrial applications
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 modified polypeptide exhibits improved thermal tolerance and stability, effectively degrading DON and addressing the contamination issues in grains.
Implementation Method 1
a modified polypeptide having DON degradation activity
Data Source
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AI summary
The present disclosure relates to a modified polypeptide having DON degradation activity.