GFLV Virus-Like Particles for Stable Compound Delivery
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Solution Overview
Problem
Existing virus-like particles (VLPs) derived from animal or plant viruses face challenges in production complexity, stability, and functionality, particularly in forming icosahedral structures without nucleic acids and allowing surface exposure or internalization of compounds, limiting their versatility and efficiency in pharmaceutical and agrosciences applications.
Innovation Solution
Development of VLPs derived from Grapevine fanleaf virus (GFLV) coat proteins that can self-assemble into stable, nucleic-acid-free particles, enabling genetic fusion of large foreign compounds, surface exposure, and internalization, with the ability to conjugate up to 180 different antibodies or antibody derivatives without competing for binding sites, facilitating versatile applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If VLPs are derived from animal viruses (retroviruses or AAVs), then they can form stable structures, but the production becomes complex and inconvenient
Solution Approach 1:
The invention extracts only the essential capsid protein function from complex animal viruses, using simplified plant virus coat proteins (GFLV, TMV, TBSV, PVM) that can self-assemble into VLPs without requiring the complex production systems of animal viruses. This extraction of core functionality resolves the contradiction by maintaining structural stability while eliminating production complexity.
Solution Approach 2:
The patent employs plant-based coat proteins that are inexpensive to produce and can be rapidly regenerated through plant regeneration, replacing expensive and complex animal virus systems. The plant-based approach allows for quick production cycles and simplified manufacturing, resolving the contradiction between stability and production complexity.
2Productivity
If VLPs are derived from plant viruses (e.g., Cowpea Mosaic virus), then they can be produced, but they require co-expression and assembly of two distinct subunits (L and S) or expression of a precursor polypeptide and a protease, making them difficult to correctly fold and produce
Solution Approach 1:
The invention extracts the essential self-assembly capability from complex multi-subunit plant viruses and identifies simplified single-subunit coat proteins (GFLV, TMV, TBSV, PVM) that can form VLPs independently. This eliminates the need for co-expression of multiple subunits and complex protease processing, resolving the contradiction between productivity and assembly complexity.
Solution Approach 2:
The patent changes the structural parameters of the coat protein design by selecting viruses with simple single-subunit architectures. This parameter change from multi-subunit to single-subunit systems enables correct folding and assembly without requiring complex post-translational processing, resolving the contradiction between production capability and assembly complexity.
3Adaptability or versatility
If existing VLPs are constructed with capsid proteins, then they can expose peptides to the exterior, but they allow coupling of generally only small molecules and generate large filamentous rather than icosahedral structures
Solution Approach 1:
The invention creates universal icosahedral VLP platforms using plant virus coat proteins that can accommodate various peptide and protein payloads while maintaining a consistent, compact structure. The N-terminal fusion strategy provides a universal method for both small molecule and large protein conjugation, resolving the contradiction between adaptability and structural complexity by establishing a unified structural framework.
Solution Approach 2:
The patent changes the structural parameters by selecting coat proteins that naturally form icosahedral rather than filamentous structures. This parameter change enables compact, stable VLPs with controlled size and geometry, while the N-terminal fusion approach allows versatile payload accommodation, resolving the contradiction between adaptability and structural complexity.
4Reliability
If compounds are fused to the N-terminal of coat proteins, then they can be internalized into the VLPs for protection, but this limits surface exposure capability
Solution Approach 1:
The invention segments the payload delivery function into two distinct approaches: N-terminal fusion for internalized protection and C-terminal fusion for surface exposure. This segmentation allows the system to provide both protection and surface exposure capabilities independently, resolving the contradiction between reliability of protection and adaptability of surface exposure.
Solution Approach 2:
The patent inverts the conventional approach by using C-terminal fusion for surface exposure instead of the traditional N-terminal approach. This inversion, combined with N-terminal fusion for internalization, creates a dual-mode system that can selectively achieve either protection or surface exposure based on the fusion orientation, resolving the contradiction between reliability and adaptability.
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 GFLV VLPs provide a stable, versatile platform for delivering compounds, offering both surface exposure and protection, with enhanced stability and functionality suitable for various pharmaceutical, agrosciences, and veterinary applications, including vaccines, adjuvants, and imaging agents.
Implementation Method 1
the VLPs are produced from the self-assembly of a single type of coat protein
Data Source
AI summary
The present invention relates to GFLV virus-like particles and the uses thereof in various fields, such as the pharmaceutical, agro, or veterinary areas.