Liposome Binding Peptide C-Terminal Penetration Stability
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Solution Overview
Problem
Conventional liposomes lack stability and targeting properties, leading to rapid elimination by the reticuloendothelial system and leakage of encapsulated drugs, and existing liposome binding peptides face challenges with C-terminal modification and membrane integrity.
Innovation Solution
A peptide with a C-terminal binding region and a basic N-terminal region, composed of specific amino acid sequences, that interacts with the lipid bilayer to enhance stability and targeting, and a construct for expressing this peptide to create a liposome with improved retention and drug delivery capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a simple phospholipid liposome is used, then it has excellent biocompatibility and low toxicity, but it is rapidly eliminated by the reticuloendothelial system and lacks stability in blood
Solution Approach 1:
The invention uses a composite structure consisting of phospholipids combined with specific peptides (such as cell-penetrating peptides or antibacterial peptides) to create a modified liposome. This composite approach maintains the biocompatibility of phospholipids while adding the functional benefits of peptides for enhanced blood stability and targeting capability.
Solution Approach 2:
The invention changes the surface properties of the liposome by incorporating peptides with specific amino acid sequences. This parameter change in surface composition enables the liposome to resist reticuloendothelial system recognition and prolong blood circulation time while maintaining low toxicity.
2Stability of the object's composition
If the liposome surface is modified by PEG or proteins to improve blood retention, then stability in blood is improved, but the liposome lacks targeting property to deliver drugs to target tissues
Solution Approach 1:
The invention employs peptides that serve multiple functions simultaneously: they provide blood stability through their amphiphilic nature and specific interactions with the lipid bilayer, while also enabling targeting through their inherent biological recognition capabilities. This multi-functional peptide approach eliminates the need for separate PEG modification and targeting ligand attachment.
Solution Approach 2:
The invention merges the functions of blood retention and targeting into a single peptide component. Instead of using separate PEG layers for stability and separate proteins for targeting, the peptide structure integrates both functionalities, simplifying the overall liposome construction while achieving both goals.
3Reliability
If a liposome binding peptide with N-terminal binding is used, then it binds to the liposome, but the C-terminal on the surface is difficult to modify
Solution Approach 1:
The invention inverts the traditional N-terminal binding orientation by using peptides that bind to the liposome through their C-terminal or by penetrating the membrane with the C-terminal region. This inversion makes the N-terminal accessible for modification while maintaining reliable liposome binding, thereby solving the modifiability problem.
4Adaptability or versatility
If antibacterial peptides are used to penetrate cell membranes, then they can deliver substances into cells, but they cause content leakage from the liposome by forming pores
Solution Approach 1:
The invention applies local quality control by using peptides with specific regional characteristics along their sequence. The N-terminal region is designed for one function (e.g., binding or penetration) while the C-terminal region has different properties (e.g., modification capability or membrane interaction), allowing the peptide to perform multiple functions without causing unwanted pore formation and content leakage.
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 peptide effectively binds to and penetrates lipid bilayers, enhancing the stability and targeting of liposomes, preventing drug leakage and improving delivery to specific tissues, while allowing for modification and incorporation into cells.
Implementation Method 1
a binding region for binding the lipid bilayer with a C-terminal
Implementation Method 2
a basic region which is composed of at least 6 basic amino acids
Implementation Method 3
interacting with a lipid bilayer... penetrates the membrane
Data Source
AI summary
The purpose of the present invention is to provide a method for producing a peptide that interacts with a lipid bilayer, and a lipid-bilayer-penetrating peptide obtained through the method. Provided is a lipid-bilayer-penetrating peptide constructed from 10 to 100 amino acids, the peptide having an amino acid sequence that penetrates the lipid bilayer at the C-terminal, and having an amino acid sequence with at least six contiguous arginine at the N-terminal. Also provided is a construct for producing a lipid-bilayer-penetrating peptide, the construct including, from the 5′ end toward the 3′ end, a tag region 1, a region 1 for incorporating a fluorescent protein gene sequence, a fluorescent protein gene region, a region 2 for incorporating a fluorescent protein gene sequence, a random region, and a stop codon region, and the construct being such that the random region has the aforementioned sequences.