Cationic Cell Penetrating Peptides for Cargo Delivery
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Solution Overview
Problem
Conventional cell penetrating peptides (CPPs) face challenges in effectively transporting biologically active molecules across cell membranes due to changes in cell permeability, solubility, and structural integrity when bound to cargo, limiting their industrial application in fields like medicine and cosmetics.
Innovation Solution
A novel CPP with a specific amino acid sequence, including arginine, proline, lysine, and hydrophobic amino acids, is developed, which maintains high cell permeability and biological activity even when bound to biologically active molecules, enhancing their delivery efficiency across various cell types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CPPs bind to biologically active macromolecules for delivery, then cargo transport function is improved, but cell permeability and structural integrity deteriorate
Solution Approach 1:
The patent modifies the amino acid sequence parameters of conventional CPPs by incorporating specific proline residues at defined positions (R1-R14 framework with proline at R2, R5, or R8) and optimizing the ratio of basic to hydrophobic amino acids. This parameter optimization maintains the peptide's ability to bind cargo while preserving its cell permeability and structural integrity during the delivery process.
Solution Approach 2:
The patent creates a composite peptide structure that combines multiple amino acid types (basic amino acids like arginine and lysine, hydrophobic amino acids like valine, leucine, and isoleucine, and structural proline residues) in a specific sequence framework. This composite composition enables the CPP to simultaneously achieve cargo binding, cell membrane penetration, and structural stability that conventional single-type peptide sequences cannot accomplish.
2Reliability
If conventional CPPs are used for intracellular delivery, then cargo binding capability is improved, but delivery efficiency and solubility deteriorate
Solution Approach 1:
The patent optimizes the amino acid composition parameters by establishing a specific framework (R1-R14) with controlled basic amino acid content (6.5 points or more where arginine=1 point, lysine=0.5 points) and incorporating proline residues at specific positions. This parameter optimization enhances both cargo binding capability and delivery efficiency simultaneously, resolving the trade-off between binding strength and delivery performance.
3Reliability
If conventional CPPs bind cargo, then transport function is improved, but solubility and cell permeability deteriorate
Solution Approach 1:
The patent designs a composite amino acid sequence incorporating basic amino acids (arginine, lysine) for cargo binding, hydrophobic amino acids (valine, leucine, isoleucine) for membrane interaction, and proline residues for structural stability. This composite composition maintains solubility and cell permeability even when cargo is bound, unlike conventional homogeneous peptide sequences.
Solution Approach 2:
The patent applies local quality optimization by placing specific amino acid types at specific positions within the R1-R14 framework. For example, proline is positioned at R2, R5, or R8 to create local structural features that maintain overall peptide flexibility and solubility while enabling cargo binding at other regions, thus preserving cell permeability during transport.
Data Source
AI summary
A cell penetrating peptide (CPP) according to the present invention is a novel cationic cell penetrating peptide that can effectively transport a biologically active molecule by passing through a cell membrane even when a biologically active molecule is bound thereto, and compared with conventional CPPs, it has excellent cell permeability enabling the transport of a biologically active molecule into cells, and the delivered biologically active molecule may effectively maintain its activity in cells. Accordingly, the CPP of the present invention may be very useful in various fields including cosmetics, diagnostics, drug delivery systems, recombinant protein vaccines, DNA/RNA therapeutics, and gene and protein therapy.