Amphiphilicity to α/γ Hybrid Foldamers through Post-Modification at Multiple Sites: Antimicrobial Design and...

Area of Science:

• Medicinal Chemistry
• Biochemistry
• Drug Discovery

Background:

• Antimicrobial drug resistance is a global health and economic burden.
• Developing novel antimicrobial agents is crucial to combat resistant microorganisms.
• Understanding structure-activity relationships is key for effective antimicrobial design.

Purpose of the Study:

• To explore post-modification of artificial peptides to introduce amphiphilicity for antimicrobial activity.
• To synthesize and evaluate hybrid peptides composed of 5-amino salicylic acid and leucine (Leu) or phenylalanine (Phe).
• To investigate the structure-function relationship of these novel peptides against bacterial pathogens.

Main Methods:

• Synthesis of hybrid peptides with varying chain lengths, charges, and cationic groups.
• Post-modification of artificial peptide sequences.
• Evaluation of antibacterial activity against the ESKAP panel of bacterial pathogens.
• Structure-function relationship analysis.

Main Results:

• The synthesized peptides exhibited broad-spectrum antibacterial activity against the ESKAP panel.
• Antimicrobial activity was dependent on peptide chain length.
• Peptides incorporating leucine (Leu) residues demonstrated higher efficacy compared to those with phenylalanine (Phe) residues.
• The approach allows for large-scale production with simplified synthesis and reduced costs.

Conclusions:

• Post-modification of artificial peptides is a viable strategy for developing novel antimicrobial agents.
• Amphiphilicity, achieved through strategic modifications, is a critical factor for antimicrobial efficacy.
• The developed peptide design offers a cost-effective and scalable method for producing new antibiotics.