Polycationic-Polyanionic Complex for Peptide Delivery
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Solution Overview
Problem
Current peptide/protein delivery methods into eukaryotic cells are inefficient, prone to protein denaturation and degradation, and limited by the type of target protein, molecular weight, or cell type, lacking a universal and robust solution.
Innovation Solution
A composition comprising a polycationic agent and a polyanionic agent, where the polyanionic agent is an inorganic polyphosphate or polyoxometalate, forming ionic complexes that enhance peptide/protein delivery efficiency across a wide range of proteins and cell types, without the need for covalent coupling agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current peptide/protein delivery methods are used, then delivery can be achieved, but delivery efficiency is low and protein denaturation and degradation occur
Solution Approach 1:
The patent uses a composite delivery system combining cationic lipids with cell-penetrating peptides to create a synergistic effect. The cationic lipids form complexes with the protein while the peptides facilitate cellular uptake, achieving both high delivery efficiency and protein protection through the combined properties of different materials
Solution Approach 2:
The patent introduces delivery agents as intermediaries between the protein and cell. These agents (cationic lipids and peptides) mediate the interaction by forming protective complexes that shield the protein from degradation while enabling efficient cellular uptake through membrane interaction
2Productivity
If delivery agents are used to facilitate protein delivery, then delivery into cells is improved, but the method is limited by target protein type, molecular weight, or cell type
Solution Approach 1:
The patent employs cell-penetrating peptides with universal transduction domains that can deliver various proteins across different cell types. The peptides are designed to function broadly rather than being specific to particular proteins or cell types, enhancing the versatility of the delivery system
3Productivity
If conventional transfection agents are used, then protein delivery is facilitated, but the agents may be toxic to host cells
Solution Approach 1:
The patent optimizes the charge ratio and composition of the delivery complex to achieve effective delivery while minimizing toxicity. By adjusting parameters such as the lipid-to-protein ratio and peptide concentration, the system maintains delivery efficiency while reducing harmful effects on host cells
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 solution achieves more efficient, uniform, and robust peptide/protein delivery, increasing transfection efficiency and maintaining protein integrity, as demonstrated by higher mean fluorescence intensity and cytosolic localization of delivered proteins.
Implementation Method 1
A composition for delivering a peptide or protein into a cell, which composition comprises a polycationic agent and a polyanionic agent
Data Source
AI summary
A composition comprising a polycationic agent and a polyanionic agent, and kits comprising the composition, is provided. In embodiments, the polyanionic agent is a nucleic acid and the polycationic agent is a modified polyalkyleneimine polymer.