TMV Expression Vector Agroinfection and Silencing Suppression
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Solution Overview
Problem
Current Tobacco Mosaic Virus (TMV) expression vectors face challenges such as complex and costly in vitro transcription and rub inoculation processes, low agroinfection efficiency, and difficulties in high-throughput workflows, along with issues related to post-transcriptional gene silencing and hypersensitive plant responses to high Agrobacterium concentrations.
Innovation Solution
Development of novel TMV expression vectors with improved cloning sites and agroinfection methods, including the use of a 35S-promoter driven TMV vector in a mini-binary plasmid and the co-introduction of the RNA silencing suppressor p19, which enables efficient directional cloning and high-throughput expression of recombinant proteins without the need for restriction enzyme digestion, and a CP deletion vector for enhanced biocontainment and protein expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If in vitro transcription and rub inoculation are used for TMV vector delivery, then high-level protein expression is achieved, but the process becomes complex and costly
Solution Approach 1:
The patent extracts the essential function of TMV vector delivery from the complex in vitro transcription and rub inoculation process by using a simplified agroinfection method with Agrobacterium tumefaciens that directly delivers the viral genome to plant cells, eliminating the need for manual inoculation steps while maintaining high expression levels
Solution Approach 2:
The patent introduces Agrobacterium tumefaciens as an intermediary organism that mediates the delivery of TMV vector DNA to plant cells through natural transformation processes, replacing the direct mechanical rub inoculation method and simplifying the overall delivery workflow
2Device complexity
If agroinfection is used for TMV vector delivery, then cost and complexity are reduced, but agroinfection efficiency is low
Solution Approach 1:
The patent modifies key parameters of the agroinfection process including optimizing Agrobacterium strain selection, adjusting infiltration conditions, and modifying the TMV vector construct to enhance compatibility with agroinfection, thereby significantly improving delivery efficiency while maintaining the simplified workflow
Solution Approach 2:
The patent performs preliminary optimization of the TMV vector construct design and Agrobacterium culture conditions before actual plant infiltration, pre-testing and adjusting parameters to ensure maximum infection efficiency is achieved during the agroinfection process
3Adaptability or versatility
If standard TMV vectors are used, then cloning flexibility is limited, but vector size is reduced
Solution Approach 1:
The patent segments the TMV genome into modular functional domains including separate promoter regions, multiple cloning sites, and regulatory elements that can be independently modified and recombined, allowing flexible cloning of different gene inserts while maintaining overall vector integrity and manageable size
Solution Approach 2:
The patent designs the TMV vector with universal features including multiple cloning sites compatible with various restriction enzymes, standardized promoter elements, and flexible gene insertion positions that enable the same vector backbone to accommodate diverse foreign DNA sequences for different protein expression needs
4Reliability
If high concentrations of Agrobacterium are used for infiltration, then transformation efficiency increases, but hypersensitive plant responses occur
Solution Approach 1:
The patent optimizes the Agrobacterium infiltration parameters by adjusting bacterial concentration, infiltration buffer composition, and incubation conditions to achieve effective transformation at lower Agrobacterium doses, thereby avoiding the activation of plant hypersensitive defense responses that occur with high bacterial concentrations
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 new TMV expression system facilitates high-level, efficient, and cost-effective expression of recombinant proteins in plants, with improved agroinfection efficiency and biocontainment, allowing for rapid and reliable production of proteins of interest.
Implementation Method 1
The T-DNA is transcribed in planta, to generate biologically active viral RNAs that can initiate self-replication
Implementation Method 2
ectopic transient expression of an RNA silencing suppressor protein (such as the p19 protein from tomato bushy stunt virus) suppressed the PTGS of the introduced T-DNA
Data Source
AI summary
Modified expression vectors, including Tobacco Mosaic Virus (TMV) expression vectors, methods for modifying such vectors, and uses of the same are disclosed.