Antimicrobial Peptide Sequences for Potent, Lower-Toxicity Microbial Action
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Solution Overview
Problem
Existing natural product-derived antimicrobial compositions face challenges due to large particle sizes, limiting their effectiveness, and there is a need for improved antimicrobial substances with enhanced activity and reduced toxicity.
Innovation Solution
Development of antimicrobial peptides with specific amino acid sequences (SEQ ID NO: 5 to SEQ ID NO: 8) and their derivatives, which exhibit potent antimicrobial activity against bacteria and fungi, including Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Candida albicans, while minimizing toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural product-derived antimicrobial compositions are used, then antimicrobial effect is achieved, but particle size is large and effectiveness is limited
Solution Approach 1:
The patent extracts and utilizes specific amino acid sequences (peptides) from natural sources, isolating the active antimicrobial components while removing the bulk material that causes large particle size. This extraction approach maintains the biological activity while achieving much smaller effective particle dimensions suitable for topical applications.
Solution Approach 2:
The invention segments the natural product into specific functional peptide units (e.g., sequences containing Arg, Lys, Leu, Phe, Ile, Tyr residues) rather than using the whole natural product. This segmentation allows the active antimicrobial moieties to act independently at much smaller scales, resolving the particle size effectiveness contradiction.
2Reliability
If conventional peptides are used, then antimicrobial activity is achieved, but toxicity is high
Solution Approach 1:
The patent designs peptides with specific local amino acid compositions and sequences (e.g., particular arrangements of Arg, Lys, Leu, Phe, Ile, Tyr) that create localized hydrophobic and hydrophilic regions. This local quality optimization allows selective interaction with microbial membranes while minimizing damage to mammalian cells, thereby reducing toxicity while maintaining antimicrobial activity.
Solution Approach 2:
The invention systematically varies peptide parameters including amino acid sequence, length, charge distribution, and hydrophobicity to optimize the activity-toxicity ratio. By changing these parameters, the peptides achieve enhanced antimicrobial potency at lower concentrations, reducing the harmful effects on host tissues.
Data Source
AI summary
The present disclosure relates to an antimicrobial peptide, a derivative thereof, or a fragment thereof; a polynucleotide encoding the antimicrobial peptide, a derivative thereof, or a fragment thereof; and a carrier for external skin preparation, a cosmetic composition, a quasi-drug composition, and a pharmaceutical composition containing the antimicrobial peptide, a derivative thereof, or a fragment thereof.