Recombinant Plant Cells for Omega-3 Fatty Acid Synthesis
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Solution Overview
Problem
There is a need for more efficient production of long-chain polyunsaturated fatty acids (LC-PUFA) in recombinant cells, particularly in seeds of oil-seed plants, as current methods are inefficient and rely heavily on fish-derived sources which are unsustainable.
Innovation Solution
The development of recombinant cells, specifically plant cells and seed cells, that express exogenous polynucleotides encoding for Δ5 elongase and ω3 desaturase enzymes. These enzymes enhance the conversion of EPA to DPA and other ω3 LC-PUFA, achieving efficiencies of at least 60% and 40% respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fish-derived sources are used for LC-PUFA production, then the supply of omega-3 fatty acids is maintained, but the sustainability and reliability of the source deteriorates due to decline in global fisheries
Solution Approach 1:
The patent introduces plant cells as an intermediary production system. These engineered plants contain microbial desaturase and elongase enzymes that mediate the conversion of plant-native fatty acids (linoleic and alpha-linolenic acid) into fish-like omega-3 LC-PUFAs (EPA and DHA), thereby replacing the need for direct fish-derived sources while maintaining product quality and sustainability
Solution Approach 2:
The patent changes the biochemical parameters of plant cells by introducing foreign enzymes with specific catalytic activities. The microbial desaturases (with altered delta-12, delta-15, or delta-17 specificity) and elongases modify the fatty acid synthesis pathway parameters, enabling plants to produce omega-3 LC-PUFAs at commercially viable levels (greater than 10% of total fatty acids)
2Productivity
If conventional plant fatty acid synthesis pathways are used, then plant cells naturally produce fatty acids, but the capacity to synthesize long-chain omega-3 fatty acids (EPA, DPA, DHA) is insufficient due to lack of necessary enzymes
Solution Approach 1:
The patent segments the complex fatty acid synthesis pathway into distinct enzymatic steps and introduces them separately into plant cells. Specifically, it introduces microbial desaturase enzymes (for creating double bonds at specific positions) and elongase enzymes (for extending carbon chains) as separate genetic components, allowing each enzyme to perform its specialized function in the omega-3 LC-PUFA production pathway
Solution Approach 2:
The patent creates a composite biochemical system by combining plant-native fatty acid synthesis machinery with introduced microbial desaturase and elongase enzymes. This composite system leverages the plant's natural ability to produce precursor fatty acids while adding microbial enzymatic capabilities to convert these precursors into target omega-3 LC-PUFAs, achieving a synergistic production system
3Productivity
If multiple foreign genes are introduced into plant cells to enhance omega-3 production, then the LC-PUFA production efficiency improves, but the complexity of genetic transformation and stability maintenance increases
Solution Approach 1:
The patent employs universal promoter elements and selectable marker genes that function across different plant species and transformation contexts. The use of constitutive promoters (such as CaMV 35S) and common selectable markers (like neomycin phosphotransferase II) provides multi-functional capabilities that simplify the genetic transformation process and enhance stability of transgene expression across generations
Solution Approach 2:
The patent incorporates selectable marker genes (such as neomycin phosphotransferase II) that enable self-selection of successfully transformed cells. These markers provide self-service functionality by allowing automatic identification and maintenance of stable transgenic lines through resistance to selection agents, thereby simplifying the complex process of maintaining stable foreign gene expression
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 use of these recombinant cells results in significantly higher levels of EPA, DPA, and DHA in plant seeds, providing a sustainable and efficient alternative to fish-derived sources for LC-PUFA production.
Implementation Method 1
a Δ5 elongase which efficiently converts EPA to DPA in a recombinant cell
Implementation Method 2
an ω3 desaturase with novel properties. The ω3 desaturase is useful in recombinant pathways designed to yield EPA
Data Source
AI summary
The present invention relates to methods of synthesizing long-chain polyunsaturated fatty acids, especially eicosapentaenoic acid, docosapentaenoic acid and docosahexaenoic acid, in recombinant cells such as yeast or plant cells. Also provided are recombinant cells or plants which produce long-chain polyunsaturated fatty acids. Furthermore, the present invention relates to a group of new enzymes which possess desaturase or elongase activity that can be used in methods of synthesizing long-chain polyunsaturated fatty acids. In particular, the present invention provides ω3 destaurases, Δ5 elongases and Δ6 desaturases with novel activities. Also provided are methods and DNA constructs for transiently and/or stably transforming cells, particularly plant cells, with multiple genes.