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Decoding Iterative Chain Elongation: Mechanistic and Structural Insights into Schizochytrium-Sourced
Guoxiang Chi1, Li Tian2, Sanqian Lin2
1Xiamen Key Laboratory of Traditional Chinese Medicine Bio-engineering, School of Pharmacy, Xiamen Medical College, Xiamen 361023, China.
Journal of Agricultural and Food Chemistry
|December 12, 2025
Summary
Researchers engineered microbial production of essential long-chain polyunsaturated fatty acids (LC-PUFAs) by understanding and modifying the PUFA synthase enzyme. This work advances sustainable omega-3 fatty acid production.
Area of Science:
- Biochemistry
- Molecular Biology
- Biotechnology
Background:
- Long-chain polyunsaturated fatty acids (LC-PUFAs), like EPA and DHA, are vital for health but face sustainable sourcing challenges.
- Engineered microbial production offers a promising alternative for obtaining these essential fatty acids.
- The ketosynthase-chain length factor (KSB-CLF) enzyme in marine protists is key to LC-PUFA synthesis, but its mechanisms are not fully understood.
Purpose of the Study:
- To elucidate the structural and molecular mechanisms of *Schizochytrium*-KSB-CLF.
- To enhance LC-PUFA production through rational enzyme engineering.
- To provide a framework for optimizing PUFA synthases for sustainable omega-3 fatty acid generation.
Main Methods:
- Computational design, site-directed mutagenesis, and in vitro enzymatic assays were used to study *Schizochytrium*-KSB-CLF.
- Structural analyses identified key residues for catalysis and substrate/protein interactions.
- Rational engineering focused on modifying the hydrophobic substrate channel of the enzyme.
Main Results:
- A conserved catalytic triad (C196-H332-H367) and key electrostatic residues (K302, R541, R636) involved in ACP and acyl-CoA binding were identified.
- A F235W mutant exhibited significantly enhanced activity (77% for C18-CoA, 28% for C20-CoA) due to channel modifications.
- Engineered *Schizochytrium* strains with the F235W mutation showed increased yields of EPA and DPA without compromising biomass or lipid content.
Conclusions:
- The study provides a mechanistic understanding of KSB-CLF function, including substrate binding and chain-length control.
- Rational engineering of the hydrophobic substrate channel can significantly enhance enzyme activity and LC-PUFA production.
- This research represents a significant advancement toward scalable and sustainable production of essential omega-3 fatty acids via microbial fermentation.
Keywords:
Chain-length controlFatty acids biosynthesisKetosynthasePolyketide synthase-like pathwayPolyunsaturated fatty acidsSchizochytrium (Aurantiochytrium)More Related Videos
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