Agrobacterium Super Ternary Vector System for Plant Transformation
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Solution Overview
Problem
Current plant transformation methods using Agrobacterium bacterium face challenges in achieving high efficiency across various plant species and genotypes, with limitations in transforming certain crops effectively due to issues like gene fragmentation and low expression levels.
Innovation Solution
The use of a super ternary vector system comprising three types of plasmids: a booster vector with the virB, virC, virD1, virD2, virD3, and virG genes of pTiBo542, a disarmed Ti plasmid, and a binary vector with a T-DNA region, allowing for improved gene introduction and transformation efficiency by enabling mutual coexistence and replication in Agrobacterium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional Agrobacterium transformation methods are used, then the basic transformation function is achieved, but transformation efficiency varies greatly across different plant species and genotypes
Solution Approach 1:
The patent segments the Agrobacterium transformation system into three independent plasmid components: a disarmed Ti plasmid providing basic transformation function, a binary vector carrying the target gene, and a booster vector enhancing transformation efficiency. This segmentation allows each component to be optimized independently for different plant species while maintaining overall system versatility.
Solution Approach 2:
The patent creates a universal transformation system where the disarmed Ti plasmid serves as a universal platform that can work with various plant species. The modular design with separate functional components (disarmed Ti plasmid, binary vector, booster vector) enables the system to adapt to different plant genotypes and species through combinatorial combinations of standardized elements.
2Manufacturing precision
If direct introduction of DNA methods are used, then transformation can be achieved, but gene fragmentation and high copy number integration occur
Solution Approach 1:
The patent uses Agrobacterium as an intermediary biological system that mediates between the target gene and the plant cell. The bacterium processes the DNA through controlled mechanisms (T-DNA boundary recognition, T-strand formation, regulated transfer) that prevent gene fragmentation while maintaining integration precision, avoiding the uncontrolled DNA introduction problems of direct methods.
3Ease of operation
If protoplast culture methods are used to prolong culture period, then transformation can be achieved, but non-fertile seeds and malformation occur due to mutations
Solution Approach 1:
The patent performs preliminary actions by using a disarmed Ti plasmid that pre-processes and prepares the T-DNA for transfer, creating a controlled and optimized transformation pathway. This preliminary preparation ensures that the introduced gene integrates correctly without requiring prolonged protoplast culture that would lead to mutations and fitness problems.
4Productivity
If standard vector systems are used, then basic transformation is achieved, but transformation efficiency is low for certain crops
Solution Approach 1:
The patent introduces a dynamic booster vector that can be selectively applied to enhance transformation efficiency in specific crop types. The system allows researchers to adjust the booster vector application based on the target plant species and genotype, creating a dynamic optimization strategy that adapts transformation efficiency to specific crop requirements rather than using a fixed standard system.
Data Source
AI summary
This invention relates to the Agrobacterium bacterium to be used in plant transformation method comprising three types of plasmids. The Agrobacterium bacterium of this invention comprises plasmids of (1) to (3) shown below:(1) a plasmid comprising the following components: (i) the virB gene, the virC gene, the virD1 gene, the virD2 gene, the virD3 gene, the virG gene and the virJ gene of pTiBo542, and(ii) an origin of replication;(2) a disarmed Ti plasmid or a disarmed Ri plasmid of Agrobacterium bacterium; and(3) a plasmid having a T-DNA region consisting of a desired DNA;wherein each of the plasmids of (1) to (3) has a replication mechanism that enables a mutual coexistence with each other.