Integrative Plasmid Design for Bacillus subtilis Virus Vector Production
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Solution Overview
Problem
Existing methods for synthesizing virus vector plasmids are limited to Escherichia coli and have not been successfully implemented in Bacillus subtilis, restricting the versatility and efficiency of virus vector production.
Innovation Solution
Development of a virus vector plasmid that can be replicated in Bacillus subtilis, incorporating nucleic acid sequences for plasmid replication and virus vector constitution, including capsid proteins, packaging proteins, terminal repeat sequences, and helper genes, enabling production of virus vectors in this alternative host.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If virus vector plasmid synthesis is performed in Escherichia coli, then the plasmid can be produced, but the versatility and efficiency of virus vector production are restricted
Solution Approach 1:
The patent creates a plasmid system that can function in multiple host organisms (both E. coli and Bacillus subtilis). The plasmid contains replication origins and regulatory elements that are compatible with both bacterial systems, allowing the same plasmid construct to be propagated and expressed in different hosts without requiring complete redesign for each organism.
Solution Approach 2:
The patent modifies plasmid parameters (replication origin sequences, promoter elements, terminator sequences) to optimize performance in Bacillus subtilis while maintaining compatibility with E. coli. By adjusting these molecular parameters, the system achieves high productivity in the novel host organism without sacrificing the established E. coli production pathway.
2Productivity
If a novel host organism (Bacillus subtilis) is used for plasmid replication, then production efficiency and purity are improved, but the technical complexity of plasmid design increases
Solution Approach 1:
The plasmid is divided into functional modules: a B. subtilis-compatible replication origin, viral genome elements (ITRs, cap, rep genes), and bacterial selection/markers. This segmentation allows each component to be independently optimized for the novel host while maintaining standard interfaces that simplify overall plasmid construction and assembly.
3Ease of manufacture
If virus vector plasmid is synthesized in Escherichia coli, then the process is well-established, but impurities are present in the final vector particles
Solution Approach 1:
The patent uses Bacillus subtilis as an intermediary host that produces cleaner vector particles. The unique cellular composition and lack of certain contaminants in B. subtilis compared to E. coli result in higher purity viral particles, while the plasmid design maintains compatibility with established manufacturing workflows through modular construction methods.
Data Source
AI summary
The present disclosure pertains to production of a virus vector plasmid. According to one aspect, the present disclosure provides a method for producing a virus vector plasmid having a sequence to be replicated in Bacillus subtilis. The method includes a step for forming a plasmid in a host cell by introducing, into the host cell, a nucleic acid that has a sequence to be replicated in Bacillus subtilis and that includes a nucleic acid sequence for producing a virus vector. In one embodiment, Bacillus subtilis could have the ability to form a plasmid from a nucleic acid acquired from outside, and therefore, in this method, the nucleic acid introduced does not have to be a plasmid.