Genetically Engineered Plants for Glucose Extraction
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Solution Overview
Problem
The availability and cost of glucose have become limiting factors for biofuel feedstock and sustainable animal feed due to high demand for corn and sugarcane, and existing methods for releasing glucose from plant-derived polymers are inefficient, requiring harsh chemical treatments or expensive enzyme cocktails.
Innovation Solution
Genetically engineered plants with altered starch mobilization genes and expressed polysaccharide degrading enzymes to increase vegetative starch levels, allowing for easier glucose extraction and reducing the need for costly pretreatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional methods are used to release glucose from plant-derived polymers, then glucose can be obtained, but harsh chemical treatments or expensive enzyme cocktails are required
Solution Approach 1:
The plant expresses its own polysaccharide degrading enzymes (such as beta-glucanases, xylanases, cellulases) within the plant tissue, allowing the plant to self-digest its own cell wall polymers and release glucose internally. This eliminates the need for external expensive enzyme cocktails or harsh chemical treatments, as the plant performs the degradation function for itself.
Solution Approach 2:
The plant is genetically engineered to express polysaccharide degrading enzymes before harvest, so that the cell wall polymers are pre-digested and glucose is made more accessible. This preliminary enzymatic action within the plant simplifies subsequent processing steps and reduces the need for costly pretreatments.
2Quantity of substance
If starch mobilization is inhibited in plants, then vegetative starch levels increase, but this requires genetic engineering of starch metabolism genes
Solution Approach 1:
The invention extracts or removes the function of starch mobilization by inhibiting key enzymes in the starch breakdown pathway (such as beta-amylase, isoamylase, limit dextrinase). By taking out the mobilization function, starch accumulates in vegetative tissues since it cannot be broken down and transported out of the chloroplasts.
Solution Approach 2:
Instead of trying to increase starch synthesis directly, the invention works in reverse by blocking starch degradation and mobilization. This inverted approach allows starch to accumulate naturally through normal photosynthesis while preventing its breakdown, achieving high starch levels through inhibition rather than enhancement.
3Adaptability or versatility
If lignocellulosic biomass is used as feedstock, then alternative to corn and sugarcane is provided, but processing difficulties arise due to recalcitrance to hydrolysis
Solution Approach 1:
The lignocellulosic plants are genetically engineered to express their own polysaccharide degrading enzymes that target their native cell wall polymers (such as beta-glucans, xylans, celluloses). The plants self-digest their recalcitrant cell walls, making glucose and other sugars more accessible without requiring external harsh pretreatments or expensive enzyme cocktails.
Solution Approach 2:
The invention changes the chemical composition parameters of the plant biomass by introducing new enzymatic activities (beta-glucanases, xylanases, cellulases) that alter the cell wall structure. This changes the physical and chemical parameters of the biomass to make it more susceptible to hydrolysis and easier to process.
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 genetically engineered plants provide a cost-effective and efficient source of glucose, enhancing biofuel production and animal feed energy content without the need for expensive enzyme cocktails or harsh chemical treatments.
Implementation Method 1
a first isolated nucleic acid that encodes a product that inactivates or inhibits expression of at least one gene encoding a protein involved in mobilization of starch in a plant
Implementation Method 2
a second isolated nucleic acid that encodes at least one polysaccharide degrading enzyme
Implementation Method 3
polysaccharide degrading enzymes to increase vegetative starch levels, allowing for easier glucose extraction
Data Source
Figure 1A~1C
Figure 1D~1G
Figure 2
AI summary
Genetically engineered plants having altered levels of one or more starch regulation enzymes and a polysaccharide degrading enzyme are provided. Methods of genetically engineering plants to express products altering expression of one or more starch regulation enzymes and polysaccharide degrading degrading enzymes, and genetic constructs are provided. Methods of agricultural processing and animal feed using the genetically engineered plants are described.