Protein-Enriched Microvesicles for Controlled Cellular Delivery
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Solution Overview
Problem
Current methods for protein delivery, such as transfection and electroporation, face challenges including the need for purified protein stocks, issues with packaging efficiency, toxicity, and control over protein amount delivered.
Innovation Solution
The development of protein-enriched micro-vesicles, which are produced by maintaining cells with membrane-associated proteins and target proteins under conditions that facilitate micro-vesicle formation, allowing for the delivery of target proteins into cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If standard recombinant protein production methods are used, then protein can be obtained, but issues with solubility, yield, correct folding and post-translational modifications occur
Solution Approach 1:
The patent uses a virus-like particle (VLP) as an intermediary system to deliver the target protein. The VLP incorporates the target protein into its structure during assembly, allowing the protein to be delivered in a native-like conformation without requiring traditional purification. The VLP acts as a mediator that protects the protein during delivery while maintaining its structural integrity and biological activity.
2Quantity of substance
If lipid or polymer based transfection methods are used, then protein delivery is achieved, but protein specific packaging efficiency is poor due to unfavorable charge differences
Solution Approach 1:
The patent changes the fundamental parameter of delivery mechanism from chemical transfection (lipid/polymer complexes) to biological assembly (VLP incorporation). By utilizing the natural assembly process of VLPs, the target protein is packaged with high efficiency through specific protein-protein interactions rather than relying on charge-based complexation, thereby achieving both high delivery amounts and high packaging efficiency.
3Quantity of substance
If electroporation is used for protein delivery, then protein can be delivered into cells, but toxicity and high level of inconsistency occur
Solution Approach 1:
The patent replaces the mechanical electroporation method (which uses electrical pulses to create pores in the cell membrane) with a biological fusion mechanism. The VLPs fuse with the cell membrane through natural fusogenic processes, allowing protein delivery without the mechanical stress and toxicity associated with electroporation. This substitution eliminates the harmful electrical fields while achieving consistent protein delivery.
4Ease of operation
If a peptide transduction domain (PTD) is included to facilitate protein delivery, then delivery is achieved, but aggregation and precipitation occur which adversely affect delivery efficiency
Solution Approach 1:
The patent merges the target protein with the VLP structure through specific incorporation mechanisms. Instead of adding a separate PTD that causes aggregation, the target protein is integrated into the VLP assembly process where it becomes part of the structured particle. This merging approach maintains protein solubility and prevents precipitation while achieving efficient cellular delivery through the VLP's natural fusogenic properties.
5Productivity
If virus like particles are used for protein delivery, then packaging is achieved, but immune response-generating viral capsid proteins are required
Solution Approach 1:
The patent extracts the essential functional elements of VLPs (self-assembly capability, fusogenic properties, protein incorporation) while removing the immunogenic viral capsid proteins. By using non-viral amphipathic peptides or engineered protein structures that mimic VLP behavior, the system achieves high packaging efficiency without triggering immune responses, thereby separating the beneficial functions from the harmful immunogenicity.
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
This method enables efficient and controlled delivery of proteins into cells, overcoming the limitations of existing techniques by providing a fusogenic structure that can fuse with target cell membranes, ensuring effective protein transfer.
Implementation Method 1
a fusogenic structure that can fuse with target cell membranes, ensuring effective protein transfer
Data Source
AI summary
Protein enriched micro-vesicles and methods of making and using the same are provided. Aspects of the methods include maintaining a cell having a membrane-associated protein comprising a first dimerization domain and a target protein having a second dimerization domain under conditions sufficient to produce a micro-vesicle from the cell, wherein the micro-vesicle includes the target protein. Also provided are cells, reagents and kits that find use in making the micro-vesicles, as well as methods of using the micro-vesicles, e.g., in research and therapeutic applications.