Customized T4 Bacteriophage Nanoparticles for Controlled Antigen Display
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Solution Overview
Problem
Existing phage display systems face limitations in displaying full-length antigens or epitopes at high density due to size and copy number restrictions, and are unpredictable due to in vivo assembly processes, making them unsuitable for effective vaccine development.
Innovation Solution
The development of customized bacteriophages using T4 particles with Hoc and Soc proteins, allowing for controlled and reproducible display of antigens or epitopes on the phage surface through an in vitro assembly system, enabling the creation of defined T4 phage nanoparticles for vaccine delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If in vivo phage display systems are used to display antigens on phage capsid, then the connectivity between phenotype and genotype is maintained, but the assembly process becomes unpredictable with great variability in quality and copy number
Solution Approach 1:
The patent extracts the antigen display function from the complex in vivo phage assembly process by using purified phage capsid proteins and displaying antigens on pre-formed capsids in vitro. This separates the antigen display function from the viral replication and assembly processes, enabling controlled production of defined phage particles with predictable antigen copy numbers and homogeneous quality.
2Quantity of substance
If large peptide sequences or full-length proteins are displayed on phage capsid, then the antigenic coverage is improved, but the copy number per phage capsid is greatly reduced and unpredictable
Solution Approach 1:
The patent applies local quality by displaying different antigens or epitopes at different locations on the phage capsid surface. By targeting specific capsid proteins (such as pIII, pVIII, or other structural proteins) for antigen fusion, the system can accommodate larger antigenic sequences while maintaining controlled copy numbers through the defined structure of the capsid and the specific attachment sites available.
3Adaptability or versatility
If essential coat proteins pIII and pVIII are modified to display antigens, then the antigen display capability is improved, but the phage assembly function is interfered with
Solution Approach 1:
The patent segments the phage particle into separate functional components: the capsid structure (formed by purified coat proteins) and the antigen display function (provided by fusion proteins or attached antigens). By using in vitro assembly of purified components, the system maintains reliable capsid formation while achieving versatile antigen display, as the assembly process is no longer dependent on functional integrity of modified coat proteins.
4Adaptability or versatility
If helper phage or partial genetic suppression is used to generate viable phage with recombinant antigens, then the antigen display is achieved, but the system complexity increases
Solution Approach 1:
The patent uses copying by producing multiple copies of the antigen gene within the phage genome or as separate expression cassettes, then displaying the antigen product on the phage surface. This allows robust antigen display without requiring complex helper phage systems or genetic suppression mechanisms, as the antigen can be produced from simple recombinant constructs integrated into the phage genome or co-expressed with the capsid proteins.
Data Source
AI summary
Compositions and methods comprising bacteriophages are provided. In particular, the present invention includes novel and customized T4 bacteriophages uniquely designed for effective antigen and foreign particle presentation. The present invention also provides in vitro methods for the making of customized T4 bacteriophages. The compositions and methods of the present invention may be used for effective vaccine delivery systems.