TSPAN2 Scaffold Protein for Stable Multiplexed EV Cargo
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for loading therapeutic molecules into extracellular vesicles (EVs) are inefficient, unpredictable, and limit the ability to introduce multiple proteins of interest (POIs) due to the instability and interference of classical EV proteins like CD63 and CD81, preventing consistent expression and co-localization of multiple POIs.
Innovation Solution
The use of TSPAN2 as a novel EV scaffold protein allows for high-efficiency, stable expression and co-localization of multiple POIs within EVs, enhancing the modularity and versatility of EV-based therapeutic platforms by up to 10-fold improvement compared to classical EV proteins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If classical EV proteins (CD63, CD81) are used as scaffold proteins, then EVs can be produced with intrinsic therapeutic potentials, but the expression of POIs is unstable and variable over time
Solution Approach 1:
The patent changes the scaffold protein parameter from classical EV proteins (CD63, CD81) to TSPAN2, which has different expression stability characteristics. This parameter change resolves the contradiction by providing a scaffold protein that maintains stable POI expression over time while preserving EV production capability.
Solution Approach 2:
The patent creates a stable cell line that consistently expresses the TSPAN2-POI fusion construct. By copying the successful expression pattern into a stable cell line, the patent achieves reliable and reproducible POI expression across multiple passages, resolving the instability issue with classical proteins.
2Adaptability or versatility
If classical EV proteins are used as scaffolds, then POI loading can be achieved, but multiple POIs cannot be consistently co-expressed and co-localized
Solution Approach 1:
The patent uses TSPAN2's multiple domains (extracellular, transmembrane, intracellular) as separate functional segments that can independently interact with different POIs. This segmentation allows multiple POIs to be attached to different regions of TSPAN2 without interfering with each other, enabling consistent co-expression and co-localization of multiple therapeutic proteins.
Solution Approach 2:
TSPAN2 serves as a universal scaffold protein that can bind and transport multiple different types of POIs simultaneously. Its multi-functional capability allows it to act as a platform for expressing various therapeutic proteins, nucleic acids, and other cargos in a consistent and reliable manner, resolving the limitation of classical proteins.
3Quantity of substance
If transgene expression is increased to improve POI loading, then cargo capacity increases, but cell line stability declines over time
Solution Approach 1:
The patent employs endogenous sorting mechanisms where the TSPAN2-POI fusion protein is automatically incorporated into EVs during their biogenesis. This self-service approach eliminates the need for external loading methods and maintains high POI cargo capacity without compromising cell line stability, as the system naturally regulates the expression and sorting process.
4Ease of manufacture
If physical and chemical methods are used for exogenous loading, then small RNAs and chemicals can be loaded, but technical artifacts occur and RNA precipitation happens
Solution Approach 1:
The patent replaces physical and chemical loading methods (sonication, electroporation, incubation) with a biological sorting mechanism. The TSPAN2-POI fusion protein is endogenously sorted into EVs through natural cellular processes, eliminating the harmful effects of mechanical stress, chemical denaturation, and RNA precipitation associated with conventional loading methods.
Data Source
AI summary
The present invention pertains to a genetically engineered extracellular vesicle comprising an improved scaffold protein and a protein of interest. Polypeptide constructs, polynucleotide constructs, cells, pharmaceutical compositions and methods relating to the same are also disclosed.