Plastid Protein Expression via Nuclear Stability Factors
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Solution Overview
Problem
There is a lack of effective systems for controlled expression of proteins in plastids, specifically for regulating protein expression using stability factors to maintain biological activity and reduce degradation, particularly in plastids of plant and algal cells.
Innovation Solution
A method and system involving the introduction of nucleic acids encoding inducible or repressible promoters linked to stability factors into the nucleus, which associate with untranslated regions of mRNA in plastids to control protein expression, allowing for the induction or repression of protein production in response to inducers or repressors, enabling controlled expression of native or foreign proteins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protein expression is controlled using stability factors in plastids, then protein stability and biological activity are improved, but device complexity increases due to the need for nuclear-plastid coordination systems
Solution Approach 1:
The patent uses stability factors as intermediary proteins that are encoded by nuclear genes and imported into plastids to regulate mRNA stability. These stability factors act as mediators between the nuclear genome and plastid gene expression, allowing indirect control of plastid protein synthesis without directly modifying plastid genetic machinery. This resolves the contradiction by providing a reliable control mechanism while maintaining relatively simple system architecture through the use of intermediary regulatory proteins.
2Productivity
If inducible promoters are used to control protein expression in plastids, then productivity is improved through controlled yield, but device complexity increases due to additional regulatory components
Solution Approach 1:
The patent segments the gene expression control into separate functional modules: inducible promoters in the nucleus, stability factors that regulate mRNA, and target genes in plastids. This modular segmentation allows independent optimization of each component and enables flexible control of protein yield without requiring complex integrated systems. The segmentation principle resolves the contradiction by achieving high productivity through coordinated simple modules rather than a single complex regulatory mechanism.
3Loss of substance
If stability factors are introduced to reduce protein degradation, then loss of substance is reduced, but device complexity increases due to additional nucleic acid components
Solution Approach 1:
The patent implements self-service by having the stability factors recognize and bind to specific sequence elements (such as the 5' UTR of psbD mRNA) that are inherently present in the target mRNAs. The stability factors autonomously protect their target mRNAs from degradation without requiring additional external protective mechanisms. This self-service approach reduces substance loss while avoiding the need for complex external protection systems, as the mRNA molecules themselves contain the necessary recognition elements for their own stabilization.
Data Source
AI summary
This invention relates to systems, methods, and devices for inducing and/or repressing the expression of proteins. More particularly, the invention relates to systems, methods, and devices for inducing and/or repressing the expression of proteins in plastids. An exemplary embodiment involves the regulation of the expression of proteins involved in hydrogen production to stimulate the production of hydrogen gas using the methods, systems, and devices described herein.