Protein Nanoparticle Self-Packaging for Targeted mRNA Delivery
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Solution Overview
Problem
The existing methods for producing pseudo-virus nanoparticles (PVNPs) are costly and have low production efficiency, poor transfection efficiency, and lack cell-targeting properties, which affects their treatment efficacy.
Innovation Solution
A method involving three donor plasmids, each carrying specific genes, is used to create recombinant baculoviruses that express nucleocapsid and envelope proteins, which self-assemble into protein-based nanoparticles for mRNA packaging and delivery, incorporating engineered envelope proteins for cell targeting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional plasmid transfection method is used to prepare PVNP, then the nanoparticle structure is formed, but the production efficiency is low and cost is high
Solution Approach 1:
The patent divides the nanoparticle preparation process into three separate transfection steps, each introducing a specific plasmid (nucleocapsid protein gene, envelope protein gene, and target gene) into the producer cell independently. This segmentation allows for optimized expression of each component and improves overall production efficiency while reducing costs by avoiding the need for complex simultaneous transfection of multiple plasmids.
2Reliability
If conventional PVNP is used, then basic nucleic acid delivery function is achieved, but transfection efficiency is poor
Solution Approach 1:
The patent introduces engineered envelope proteins with specific cell-targeting properties to the PVNP surface, creating local functional enhancements. These engineered proteins provide specific binding capabilities to target cells, thereby improving transfection efficiency and cellular uptake without compromising the overall nanoparticle structure and nucleic acid delivery function.
3Adaptability or versatility
If conventional PVNP without engineered envelope protein is used, then simple structure is maintained, but cell-targeting property is lacking
Solution Approach 1:
The patent merges the conventional PVNP structure with engineered envelope proteins having cell-targeting properties. This combination integrates the self-assembling nucleocapsid protein core with the targeting-capable envelope protein shell, achieving both structural integrity and enhanced cell-targeting capability in a unified nanoparticle system.
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 method enhances production efficiency and transfection efficiency, enabling stable nanoparticles with cell-targeting properties, suitable for clinical applications like cancer treatment.
Implementation Method 1
The nucleocapsid protein in the producer cell can recognize a packaging signal from the target RNA and spontaneously assemble with the target RNA to form the PVNP
Implementation Method 2
then the surface of the PVNP can have the envelope protein by the budding mechanism
Data Source
AI summary
A method for preparing protein-based nanoparticle for self-packaging and delivering mRNA includes the following steps. A first donor plasmid, a second donor plasmid and a third donor plasmid are provided. A plasmid transposing step is performed. A recombinant virus preparing step is performed so as to obtain a first recombinant baculovirus, a second recombinant baculovirus and a third recombinant baculovirus. A transducing step is performed, wherein the first recombinant baculovirus, the second recombinant baculovirus and the third recombinant baculovirus are used to infect a producer cell so as to express a nucleocapsid protein, an envelope protein, an engineered envelope protein and a target RNA, and the nucleocapsid protein, the envelope protein, the engineered envelope protein and the target RNA are self-assembled to form a protein-based nanoparticle for self-packaging and delivering mRNA.