Variant Phytase Enzymes for Heat and pH Stability
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Solution Overview
Problem
Existing phytases are not stable under the high temperatures and varying pH conditions encountered during feed processing, leading to inefficient phytate hydrolysis and increased costs due to the need for additional enzyme supplementation in animal feeds, and they also contribute to environmental phosphorus pollution.
Innovation Solution
Development of variant phytases with specific amino acid substitutions that enhance thermostability and pH resistance, allowing them to maintain activity under conditions such as pelleting processes and gastric environments, thereby improving nutrient availability and reducing phosphorus excretion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing phytases are used in feed processing, then they can hydrolyze phytate and release phosphorus, but they are inactivated by high temperatures during pelleting and by low pH in the gastrointestinal tract
Solution Approach 1:
The patent applies parameter changes by modifying amino acid residues at specific positions in the phytase protein sequence. These molecular-level parameter changes alter the enzyme's physical and chemical properties, specifically enhancing its thermostability and pH resistance without changing its fundamental catalytic function. The systematic variation of amino acid parameters at key positions enables the enzyme to maintain activity under previously inactivating conditions.
Solution Approach 2:
The patent implements local quality by targeting specific amino acid positions (such as residues 67, 196, 285, and others) within the phytase molecule for modification. Rather than attempting to change the entire enzyme globally, the invention focuses local modifications at critical regions that govern thermal and pH stability. This localized approach allows the enzyme to gain resistance properties at specific sites while preserving overall catalytic functionality.
2Productivity
If additional enzyme supplementation is added to compensate for inactivation, then phosphorus release can be maintained, but feed costs increase due to the need for more enzyme
Solution Approach 1:
By changing the molecular parameters of the phytase enzyme through amino acid substitution, the patent creates a variant enzyme with enhanced stability characteristics. This modified enzyme requires lower dosages because it remains active longer during processing and in the animal's digestive system, thereby maintaining productivity while reducing the quantity of enzyme substance needed.
3Strength
If high conditioning temperature is used during pelleting, then pellet durability is improved, but phytase activity is inactivated due to high temperature
Solution Approach 1:
The patent resolves this contradiction by changing the thermal stability parameters of the phytase enzyme through amino acid modifications. The variant phytase can withstand the high temperatures (above 80°C) used for optimal pellet durability without losing catalytic activity. This allows the feed processing to achieve both strong pellet formation and effective phytate hydrolysis simultaneously.
4Productivity
If phytate is not hydrolyzed efficiently, then phosphorus is not released for animal uptake, but environmental phosphorus pollution increases from animal excretion
Solution Approach 1:
By modifying the amino acid parameters of phytase to enhance its stability and activity under gastrointestinal conditions, the patent improves phosphorus release efficiency. The variant enzyme remains active in the animal's digestive system, effectively hydrolyzing phytate and making phosphorus available for uptake. This reduces the amount of undigested phosphorus excreted into the environment, thereby addressing the pollution issue.
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 variant phytases exhibit increased residual activity at elevated temperatures and pH levels, enhancing feed efficiency and reducing environmental impact by improving nutrient access and lowering phosphorus excretion in animal manure.
Implementation Method 1
Phytase is a phosphatase that catalyzes the hydrolysis of O—P bonds in phytate and releases inorganic usable phosphorous
Data Source
AI summary
The present invention relates to variant phytase enzymes and their use thereof.