HBV VLP Cargo Tagging With SBA Linkers for High Protein Loading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for packaging protein cargo inside Hepatitis B Virus (HBV) virus-like particles (VLPs) are inefficient and require significant modifications to the cargo or VLPs, leading to misfolding and assembly inhibition, limiting their use as therapeutic delivery vehicles.
Innovation Solution
A tripartite tool comprising a Capsid Assembly Modulator (CAM), a linker, and a protein of interest, specifically using sulfamoylbenzamide (SBA) to attach the protein cargo both inside and outside the HBV VLP, allowing high loading densities without modifying the viral protein, and enabling controlled placement during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing methods are used to package protein cargo inside HBV VLPs, then cargo loading is achieved, but the efficiency is low and significant modifications to cargo or VLPs are required
Solution Approach 1:
The patent introduces a chemical tag as an intermediary component that facilitates cargo packaging inside VLPs. The tag contains a binding domain that interacts with the VLP interior surface and a reactive group that covalently attaches to the cargo protein. This intermediary approach eliminates the need for complex cargo modifications while achieving efficient packaging, directly resolving the contradiction between loading efficiency and modification complexity.
2Reliability
If cargo is packaged inside VLPs using existing strategies, then encapsulation is achieved, but cargo misfolding and assembly inhibition occur
Solution Approach 1:
The patent applies preliminary action by first attaching the chemical tag to the cargo protein in solution before VLP assembly occurs. The tag-cargo conjugate is then introduced to pre-formed VLPs, allowing the cargo to be captured at the interior surface without interfering with capsid protein self-assembly. This sequential approach prevents both cargo misfolding and assembly inhibition while maintaining packaging efficiency.
3Quantity of substance
If high concentrations of cargo are used for packaging, then cargo loading is achieved, but the process becomes inefficient
Solution Approach 1:
The chemical tag acts as a high-affinity binder that concentrates cargo at the VLP interior surface from dilute solution. The binding domain on the tag interacts strongly with the VLP interior, enabling efficient cargo capture even at low cargo concentrations. This eliminates the need for high cargo concentrations while achieving high loading densities, resolving the contradiction between quantity and efficiency.
4Adaptability or versatility
If cargo is modified significantly for VLP packaging, then packaging capability is improved, but cargo functionality may be compromised
Solution Approach 1:
The chemical tag serves as a modular intermediary that provides all necessary packaging functionality without requiring modifications to the cargo protein itself. The tag contains the binding domain for VLP interaction and the reactive group for cargo attachment, leaving the cargo's functional domains unchanged. This approach maintains cargo adaptability for packaging while preserving cargo functionality and activity.
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 tripartite tool achieves high cargo loading densities within HBV VLPs, maintaining structural integrity and enabling targeted delivery systems for therapeutic proteins, with minimal cargo modification and no disturbance to the VLP container.
Implementation Method 1
sulfamoylbenzamide (SBA) to attach the protein cargo both inside and outside the HBV VLP
Implementation Method 2
The linker is terminated with a maleimide, and the protein cargo contains a single reactive cysteine
Data Source
AI summary
Disclosed herein is a novel tool to associate protein cargo molecules to the inside and/or outside of a Hepatitis B Virus (HBV) virus-like particle (VLP). The novel tool being composed of a sulfamoylbenzamide (SBA) antiviral, linker, and protein.