Phytase Variants Enhancing IP4 Degradation and Thermostability
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Solution Overview
Problem
Current phytases used in animal feeds have limitations in degrading phytate to lower inositol phosphates, particularly IP4 and IP3, which restrict phosphate and nutrient availability in monogastric animals, and existing phytases are not thermostable enough for demanding environmental and processing conditions.
Innovation Solution
Development of phytase variants with specific amino acid substitutions that enhance IP4 degradation activity and thermostability, allowing for improved phosphate and nutrient availability in animal feeds, particularly designed for use in industrial processes and feed formulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard phytases are used for phytate degradation, then IP6 levels are reduced, but IP4 and IP3 degradation is limited and the enzyme lacks thermostability for industrial processing
Solution Approach 1:
The patent applies parameter changes by modifying specific amino acid residues in the phytase protein sequence (e.g., positions 67, 107, 154, 174, 202, 204, 211, 258, 271, 276, 277, 285, 302, 344, 352, 395) to alter the enzyme's catalytic properties and thermostability, enabling improved degradation of IP4 and IP3 while maintaining stability under industrial processing conditions
Solution Approach 2:
The patent creates composite enzymatic systems by combining multiple mutated phytase variants with complementary properties, where each variant contributes specific functionalities (e.g., one variant optimized for IP6 degradation, another for IP4 degradation, and a third for thermostability), achieving synergistic effects that overcome the limitations of single-enzyme systems
2Reliability
If phytase is used in animal feeds, then phosphate availability improves, but the enzyme must withstand high-temperature processing conditions which currently limits its effectiveness
Solution Approach 1:
The patent modifies physical-chemical parameters of the phytase enzyme through targeted amino acid substitutions that enhance thermal stability without compromising catalytic activity, allowing the enzyme to maintain functionality during high-temperature feed processing while continuing to degrade phytate effectively
3Productivity
If IP6 degradation is prioritized, then phosphate release is improved, but lower inositol phosphates (IP4, IP3) accumulate which still have antinutritive properties
Solution Approach 1:
The patent segments the phytate degradation process into multiple specialized enzymatic steps by employing phytase variants with distinct catalytic specificities, where one variant primarily degrades IP6 to IP5, another continues degradation of IP5 to IP4 and IP3, and a third completes the process to IP1, ensuring comprehensive degradation of all inositol phosphates
Solution Approach 2:
The patent develops universal phytase enzyme systems that can perform multiple functions across different substrates (IP6, IP5, IP4, IP3, IP2, IP1) through either a single multi-functional enzyme variant or a coordinated system of variants, eliminating the need for separate enzymes for each degradation step and achieving complete phytate breakdown
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 phytase variants demonstrate increased IP4 degradation activity and thermostability, effectively degrading phytate to lower inositol phosphates, improving phosphate and nutrient availability in animal feeds, even under high-temperature conditions, leading to enhanced growth performance in animals.
Implementation Method 1
Phytases are a group of phosphatase enzymes that catalyse the hydrolysis of phytic acid
Data Source
AI summary
A variant polypeptide of phytase enzyme is disclosed having increased IP4 activity and improved thermostability, as well as compositions containing said variant polypeptide, recombinant host cells for producing it, methods for its production, uses and methods wherein said variant polypeptide is used, and feed products containing said variant polypeptide.