Modified Oleosin Variants for Higher TAG Accumulation in Plants
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Solution Overview
Problem
Current methods for increasing triacylglycerol (TAG) accumulation in plants and seeds are insufficient to meet the demand for improved agricultural productivity and alternative energy sources, as existing strategies do not effectively stabilize TAG and enhance energy content.
Innovation Solution
Introduction of mutant or variant oleosin polypeptides with specific amino acid substitutions, such as arginine replacements and deletions, to stabilize TAG and enhance its accumulation in plant tissues and seeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If wild type oleosin is expressed in plants, then oil bodies are formed and TAG is stored, but TAG accumulation levels are insufficient to meet demand for improved agricultural productivity and biofuel production
Solution Approach 1:
The invention applies parameter changes by modifying the amino acid sequence of oleosin protein through site-directed mutagenesis. Specific lysine residues (K27, K105, K117, K119, K123, K128) are replaced with arginine residues, and certain amino acids are deleted to create mutant oleosins with enhanced TAG stabilization capability. This molecular-level parameter change in the protein structure directly increases TAG accumulation in oil bodies, thereby improving both the quantity of TAG and agricultural productivity for biofuel applications
2Quantity of substance
If existing strategies for increasing TAG are used, then some TAG accumulation is achieved, but TAG stabilization is ineffective and energy content is not sufficiently enhanced
Solution Approach 1:
The invention changes the chemical parameters of oleosin by substituting lysine with arginine at specific positions. This amino acid substitution alters the electrostatic interactions and hydrogen bonding patterns in the oleosin-TAG complex, enhancing the stability of TAG within oil bodies. The mutant oleosins demonstrate improved reliability in TAG stabilization compared to wild type oleosin, addressing the insufficient stabilization achieved by existing strategies
Solution Approach 2:
The invention creates copies of oleosin with modified amino acid sequences. Multiple mutant oleosin variants are generated through systematic amino acid substitutions and deletions, allowing selection of the most effective variants for TAG stabilization. These copied and modified oleosin proteins are then expressed in plants to achieve reliable TAG accumulation and stabilization
3Quantity of substance
If more oil is accumulated in plants, then energy content is enhanced, but the methods are insufficient for efficient biofuel production
Solution Approach 1:
By modifying the oleosin protein parameters at the molecular level through amino acid substitutions, the invention enhances the oil body's capacity to store and stabilize TAG. This leads to increased oil content in plant tissues and seeds. The improved TAG stabilization and accumulation directly translate to enhanced energy content and more efficient biofuel production, overcoming the limitations of existing methods
Data Source
AI summary
The invention provides mutant or variant oleosin polypeptides having one or more amino acid substitutions, particularly one or more arginine substitution for lysine, and having one or more amino acid deletions. The mutant oleosin polypeptides provide for higher triacylglycerol compared to wild type oleosin, including when the mutant oleosin is expressed in plants. Also provided are polynucleotides encoding the mutant oleosin(s), constructs and host cells comprising the polynucleotides, methods for producing oil bodies comprising the mutant oleosin(s) and for producing oil in host cells and plants. The invention also relates to plants, particularly transgenic or recombinantly engineered plants, expressing one or more of the mutant oleosin polypeptides, as well as seeds and oil bodies derived from the plants.