Phytase Variant Amino Acid Substitutions for Thermal Stability
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Solution Overview
Problem
Existing phytase products face challenges in thermal stability during high-temperature feed processing, leading to reduced enzymatic activity and increased production costs due to complex coating processes and insufficient thermal resistance of amino acid mutations.
Innovation Solution
Introduce specific amino acid substitutions at positions 295, 349, and 374 of the parent phytase sequence, combined with disulfide bond formation, to enhance thermal stability, resulting in improved residual activity under high-temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coating technology is used to protect phytase during high-temperature processing, then thermal stability is improved, but device complexity and production cost increase
Solution Approach 1:
The patent extracts and removes the coating layer from the system, instead focusing on modifying the phytase enzyme itself through amino acid substitution to achieve thermal stability. This eliminates the need for complex coating processes while maintaining the protective function.
Solution Approach 2:
The patent changes the chemical parameters of the phytase enzyme by substituting specific amino acid residues (e.g., Serine to Proline at position 295, Glutamine to Lysine at position 349, Glutamate to Arginine at position 374). These parameter changes in the enzyme's primary structure directly improve its thermal stability without requiring external coating protection.
2Reliability
If amino acid mutations are introduced to improve thermal resistance, then thermal stability is improved, but enzymatic activity is largely lost during high temperature granulation
Solution Approach 1:
The patent carefully selects specific amino acid substitutions that change the enzyme's thermal properties without compromising its catalytic function. The substitutions at positions 295, 349, and 374 are chosen to enhance thermal stability while preserving the active site structure and enzymatic activity.
Solution Approach 2:
The patent applies local quality changes by making targeted amino acid substitutions only at specific positions (295, 349, 374) rather than throughout the entire enzyme structure. This localized modification approach improves thermal stability while maintaining the overall functional integrity and catalytic activity of the enzyme.
3Reliability
If multiple amino acid substitutions are made to enhance thermal stability, then residual activity after high-temperature treatment is improved, but the complexity of protein engineering increases
Solution Approach 1:
The patent segments the protein engineering task into three specific, independent substitution sites (positions 295, 349, and 374). This segmentation allows for systematic optimization of thermal stability through targeted mutations rather than attempting to modify the entire enzyme structure simultaneously.
Solution Approach 2:
The patent applies parameter changes at three key positions to achieve cumulative improvement in thermal stability. Each substitution (Ser295Pro, Gln349Lys, Glu374Arg) contributes additively to the overall thermal resistance, with the combined effect providing superior residual activity after high-temperature treatment compared to single mutations.
Data Source
AI summary
Provided is a parent phytase variant, which relates to the technical field of protein engineering. The variant, relative to the parent phytase thereof, has one or more amino acid substitutions at positions corresponding to positions 295, 349, and 374 of SEQ ID NO: 1. Compared to the parent phytase, the variant has increased thermal stability.