Modified Oxygenase for ω3-Selective Fatty Acid Epoxidation
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Solution Overview
Problem
Existing methods for epoxidizing highly unsaturated fatty acids, such as arachidonic acid and eicosapentaenoic acid, fail to specifically epoxidize the physiologically important position-ω3, leading to non-specific epoxidation and decomposition of the fatty acid.
Innovation Solution
A modified oxygenase with specific amino acid substitutions, such as F87K/I/H, A330V, P25L, and T438M, is introduced to enhance the catalytic activity of cytochrome P450 monooxygenase, enabling selective epoxidation of the position-ω3 of highly unsaturated fatty acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wild-type bacterium-derived P450 is used for epoxidation, then catalytic activity is high, but reaction position specificity is low leading to decomposition
Solution Approach 1:
The patent applies parameter changes by modifying amino acid residues at specific positions (87, 25, 330, 438) in the P450 enzyme sequence. These positional parameters were systematically varied through site-directed mutagenesis to optimize both catalytic activity and position specificity for ω3-selective epoxidation
Solution Approach 2:
The patent applies local quality by making targeted amino acid substitutions at specific local positions (87, 25, 330, 438) in the enzyme structure. Each position was optimized independently to enhance substrate binding specificity at the ω3 position while maintaining overall catalytic function
2Ease of manufacture
If chemical oxidation with hydrogen peroxide and lipase is used, then double bonds at positions-ω6 and -ω9 are epoxidized, but position-ω3 cannot be specifically epoxidized
Solution Approach 1:
The patent replaces the chemical oxidation system (hydrogen peroxide + lipase) with an enzymatic system (modified P450). This substitution enables precise biological control over reaction specificity while maintaining ease of handling through enzymatic catalysis under mild conditions
3Productivity
If reaction progresses with wild-type P450, then epoxidation occurs, but non-specific epoxidation leads to fatty acid decomposition
Solution Approach 1:
The patent converts the potentially harmful non-specific epoxidation activity of wild-type P450 into a beneficial selective ω3-epoxidation process. Through amino acid mutations, the enzyme's high reactivity is redirected to specifically target the ω3 position, transforming decomposition-prone non-specific reaction into stable product formation
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 oxygenase achieves high specificity in epoxidizing the position-ω3 of fatty acids, producing ω3-epoxidized fatty acids with improved yield and stability, suitable for industrial applications.
Implementation Method 1
a modified oxygenase with specific amino acid substitutions, such as F87K/I/H, A330V, P25L, and T438M, is introduced to enhance the catalytic activity of cytochrome P450 monooxygenase, enabling selective epoxidation of the position-ω3 of highly unsaturated fatty acids
Data Source
AI summary
It is an object of the present invention to provide a modified oxygenase that specifically epoxidizes only the position-ω3 of highly unsaturated fatty acid. The present invention relates to: a polypeptide consisting of an amino acid sequence containing one or two or more amino acid substitutions selected from the group consisting of F87K/I/H, A330V, P25L and T438M, in the amino acid sequence as set forth in SEQ ID No: 2; and a polypeptide substantially identical to the aforementioned polypeptide.