Induction-Controlled Lytic Phage Production in Non-Pathogenic Hosts
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Solution Overview
Problem
Current methods for producing lytic phage particles are inefficient and unsafe due to the use of pathogenic bacterial hosts and the difficulty in manipulating certain bacterial species, making large-scale industrial production challenging.
Innovation Solution
A production bacterial cell system is developed that stably comprises lytic phage structural and DNA packaging genes, controlled by an induction mechanism, allowing for the production of pure lytic phagemids using a non-lytic phage genome in a non-lytic host, enabling safe and efficient production of lytic phage particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pathogenic bacterial hosts are used for phage production, then productivity is improved, but safety deteriorates
Solution Approach 1:
The patent segments the phage production system into two independent parts: (1) a safe non-pathogenic host strain that provides the cellular machinery for phage replication, and (2) the lytic phage genome itself that provides the structural and functional genes. This separation allows production without using pathogenic hosts, eliminating safety risks while maintaining productivity.
Solution Approach 2:
The patent uses a non-pathogenic bacterial strain as an intermediary host that can be safely manipulated and scaled for industrial production. This intermediary host performs the same phage production function as pathogenic hosts would, but without the associated safety hazards, enabling safe large-scale manufacturing.
2Productivity
If genetic manipulation tools are limited in certain bacterial species, then ease of manufacture deteriorates, but productivity may be improved by using native hosts
Solution Approach 1:
The patent employs universal genetic manipulation tools and standardized plasmid systems that can be applied across different bacterial species. The use of commonly compatible vectors, promoters, and selection markers makes the production system adaptable to various host strains, improving ease of manufacture while maintaining production capacity.
Solution Approach 2:
The patent optimizes various parameters including host strain selection, growth conditions, induction parameters, and plasmid copy numbers to achieve high productivity in non-pathogenic hosts. By adjusting these parameters, the system overcomes the limitations of working with non-native or less-manipulable bacterial species.
3Ease of operation
If lytic phages are stably maintained in the genome or as episomes, then ease of operation is improved, but reliability deteriorates because lytic phages are naturally incapable of stable maintenance
Solution Approach 1:
The patent creates a dynamic system where the lytic phage genome is maintained in a dormant state within the host chromosome or as an episome under non-inducing conditions, then dynamically activated upon induction. This allows stable maintenance during storage and propagation, followed by reliable lytic cycle initiation when needed, resolving the contradiction between stability and functionality.
Solution Approach 2:
The patent performs preliminary actions by integrating the lytic phage genome into the host chromosome or maintaining it as a stable episome before induction. This preliminary stabilization allows the system to be prepared and stored safely, then triggered to produce functional lytic phages when required, ensuring both ease of operation and reliability.
4Ease of manufacture
If current production methods are used, then manufacturing simplicity is maintained, but productivity deteriorates due to inefficiency and safety concerns
Solution Approach 1:
The patent designs a self-service production system where the host bacteria naturally perform phage replication and assembly functions through their existing cellular machinery. The system requires minimal external intervention beyond induction, allowing scalable production while maintaining simplicity. The host's own metabolic pathways and protein synthesis machines are harnessed to produce phages efficiently.
Data Source
AI summary
The present invention concerns a production bacterial cell for producing lytic phage particles or lytic phage-derived delivery vehicles, said production bacterial cell stably comprising at least one phage structural genes and at least one phage DNA packaging genes, said phage structural gene(s) and phage DNA packaging gene(s) being derived from a lytic bacteriophage, wherein the expression of at least one of said phage structural genes and/or at least one of said phage DNA packaging gene(s) in said production bacterial cell is controlled by an induction mechanism.