Antimicrobial Constructs Using Membrane Interacting Peptides
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Solution Overview
Problem
The development of new antibiotics is hindered by poor penetration of drugs into bacteria and off-target toxicity, particularly for antimicrobial peptides that are toxic to mammalian cells or have reduced activity in vivo.
Innovation Solution
An antimicrobial construct comprising a membrane interacting peptide and an antimicrobial agent, where the peptide associates with a prokaryotic cell membrane, allowing for targeted delivery and minimizing toxicity to mammalian cells, using peptides like lactoferrin or WLBU2 conjugated with antimicrobial agents such as linezolid, and employing carriers like porous silicon nanoparticles for enhanced delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antimicrobial peptides are used to treat bacterial infections, then broad spectrum activity and rapid killing of target cells is achieved, but toxicity to mammalian cells increases
Solution Approach 1:
The patent uses membrane-interacting peptides as intermediary carriers that selectively bind to and deliver antimicrobial agents across bacterial membranes. These peptide carriers facilitate the transport of hydrophobic antibiotics like linezolid into bacterial cells while minimizing direct contact between the antimicrobial agent and mammalian cells, thereby reducing off-target toxicity while maintaining antimicrobial efficacy
Solution Approach 2:
The invention modifies the local properties of antimicrobial agents by conjugating them to membrane-interacting peptides with specific sequences (e.g., lactoferrin-derived peptides, WLBU2) that exhibit selective affinity for bacterial membranes over mammalian cell membranes. This localized modification enables the antimicrobial construct to concentrate at the bacterial cell surface and internalize preferentially, achieving selective toxicity
2Reliability
If conventional antibiotics are used, then antimicrobial activity is achieved, but poor penetration into bacteria limits effectiveness
Solution Approach 1:
The patent employs membrane-interacting peptides as intermediary delivery vehicles that facilitate the penetration of hydrophobic antimicrobial agents into bacterial cells. These peptide carriers bind to the antimicrobial agent, enable membrane translocation through their amphipathic structure and membrane-disrupting activity, and release the agent inside the bacterial cell, thereby overcoming the penetration barrier that limits conventional antibiotic effectiveness
Solution Approach 2:
The invention creates composite antimicrobial constructs by chemically conjugating membrane-interacting peptides to hydrophobic antimicrobial agents such as linezolid. This composite structure combines the membrane-targeting and penetration capabilities of the peptide carrier with the antimicrobial activity of the drug, enabling effective delivery of antibiotics that would otherwise have poor bacterial penetration
3Reliability
If new antimicrobial agents are developed, then activity against resistant pathogens is improved, but off-target effects increase
Solution Approach 1:
The patent uses membrane-interacting peptide carriers as intermediaries that selectively target bacterial cells and facilitate the delivery of antimicrobial agents. This targeted delivery mechanism ensures that the antimicrobial activity is concentrated at the bacterial cell site, minimizing exposure to and off-target effects on healthy mammalian tissues while maintaining potent activity against resistant pathogens
Solution Approach 2:
The invention introduces local selectivity by conjugating antimicrobial agents to peptides with specific sequences that exhibit preferential binding to bacterial membrane components (such as lipopolysaccharides in gram-negative bacteria) over mammalian cell membranes. This localized targeting reduces off-target effects while preserving or enhancing activity against resistant bacterial pathogens
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 antimicrobial construct achieves selective activity against gram-negative bacteria with minimal toxicity to mammalian cells, improving the efficacy of antimicrobial agents and prolonging survival in infected subjects.
Implementation Method 1
the membrane interacting peptide associates with a prokaryotic cell membrane
Data Source
AI summary
Disclosed herein are antimicrobial constructs comprising a membrane interacting peptide and an antimicrobial agent. Also disclosed are methods for making and using the constructs.