Short Antimicrobial Peptides Reducing Cytotoxicity
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Solution Overview
Problem
Current antimicrobial peptides (AMPs) face challenges in achieving strong antimicrobial activity against both Gram-positive and Gram-negative bacteria while minimizing cytotoxicity and size, which limits their effectiveness and production efficiency.
Innovation Solution
Development of novel short antimicrobial peptides, specifically analogs of temporin-SHf, with optimized sequences and structures that enhance antimicrobial activity while reducing hemolytic activity and cytotoxicity, allowing for broader bacterial coverage and easier synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antimicrobial peptides are designed to have strong antimicrobial activity against both Gram-positive and Gram-negative bacteria, then their effectiveness increases, but their cytotoxicity and size tend to increase as well
Solution Approach 1:
The patent applies parameter changes by systematically modifying the amino acid sequence parameters of temporin-SHf analogs. Specific substitutions include replacing position 2 with hydrophobic amino acids (Ile, Leu, Val, Phe) and position 5 with basic amino acids (Arg, Lys), while maintaining the 8-residue core structure. These parameter modifications optimize the balance between antimicrobial activity and cytotoxicity, achieving broad-spectrum activity against Gram-positive and Gram-negative bacteria with reduced hemolytic effects compared to the native peptide.
2Reliability
If antimicrobial peptides are designed to have strong antimicrobial activity against both Gram-positive and Gram-negative bacteria, then their effectiveness increases, but their size increases which limits production efficiency
Solution Approach 1:
The patent extracts the essential antimicrobial core from the full-length temporin-SHf sequence by focusing on an 8-residue minimal analog (FFFLSRIFamide). This extracted core retains broad-spectrum antimicrobial activity against both Gram-positive and Gram-negative bacteria while being significantly shorter than the native 17-residue temporin-SHf, thereby improving production efficiency through easier chemical synthesis and lower costs.
3Reliability
If the peptide sequence is optimized for broad bacterial coverage, then antimicrobial activity improves, but the complexity of achieving the right balance between activity and reduced hemolytic activity increases
Solution Approach 1:
The patent applies local quality by making targeted amino acid substitutions at specific positions within the peptide sequence rather than random modifications. Position 2 is optimized with hydrophobic amino acids to enhance membrane interaction, position 5 is optimized with basic amino acids to improve bacterial binding, while positions 1, 3, 4, 6-8 are maintained or minimally modified. This localized optimization strategy systematically achieves broad-spectrum activity with reduced hemolytic complexity.
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 new peptides demonstrate improved antimicrobial activity against a range of bacteria, including resistant strains, with reduced cytotoxicity and smaller size, facilitating more efficient production and application in therapeutic and disinfectant contexts.
Implementation Method 1
their mode of action is based on permeabilisation or rapid fragmentation of the microorganism membrane
Implementation Method 2
Cationic antimicrobial peptides are thought to be one of the key components of the innate immune system
Implementation Method 3
the temporins are particularly active against Gram-positive bacteria and yeasts
Data Source
AI summary
The present invention relates to novel short antimicrobial peptides derived from SHf, to pharmaceutical compositions comprising said peptides and to the uses thereof, in particular as medicament, disinfectant, preservative, agent preventing biofilm formation or pesticide.