Phytase Enzyme Mutations for Feed Phosphorus Release
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Solution Overview
Problem
Current phytase products for animal feed have limitations in production levels, time, stability at high temperatures, stability at low pH, specific activity, and dosage requirements, leading to inefficiencies and increased costs in providing phosphorus to animals.
Innovation Solution
Development of polypeptides with enhanced phytase activity, thermostability, and thermotolerance, encoded by specific nucleotide sequences, which are expressed in gram-negative bacteria such as Pseudomonas fluorescens, enabling higher yields, faster production, and improved stability across various pH and temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current phytase products are used for animal feed, then phosphorus can be provided to animals, but production levels are limited and production time is extended
Solution Approach 1:
The patent modifies the amino acid sequence of phytase through site-directed mutagenesis, specifically changing residues in the catalytic domain to enhance enzymatic activity and stability, thereby increasing production efficiency and reducing production time
2Reliability
If current phytase products are used, then phosphorus supplementation is achieved, but stability at high temperatures is insufficient
Solution Approach 1:
The patent introduces specific amino acid substitutions (e.g., T215S, Q216R, N217K) in the catalytic domain to enhance thermostability while preserving or improving enzymatic activity through optimized catalytic mechanism
3Reliability
If current phytase products are used, then phosphorus is supplied to animals, but stability at low pH is poor
Solution Approach 1:
The patent modifies surface charge distribution through amino acid substitutions (e.g., E225K, D226K) to enhance stability in acidic gastric environment, reducing dosage requirements and improving manufacturability
4Productivity
If current phytase products are used, then phosphorus supplementation is achieved, but specific activity is low requiring higher dosages
Solution Approach 1:
The patent optimizes the catalytic domain through multiple amino acid substitutions to enhance substrate binding affinity and catalytic turnover rate, thereby increasing specific activity and reducing required dosage
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 solution achieves higher specific activity, increased stability, and reduced dosage needs, leading to more efficient phosphorus release for animal growth and reduced environmental phosphorus contamination.
Implementation Method 1
Phytase is a phosphoric monoester hydrolase enzyme that catalyzes hydrolysis of phytic acid (myo-inositol-hexakisphosphate) to phosphorus and inositol
Data Source
AI summary
Polypeptides having phytase activity and polynucleotide sequences encoding the phytases are provided. The gene expresses the phytase at a level of at least 7 g/L to 40 g/L. The phytase have higher specific activity, retain activity at low pH, and retain activity at high temperature. The phytase can be used in a variety of compositions including food, feed, pharmaceuticals, and cleaning.