Novel Peptides Show Promise Against ESKAPE Pathogens

Strategic Insights -

Researchers at St. Joseph's College of Engineering in India have made significant advances in developing novel peptides that exhibit broad-spectrum activity against ESKAPE pathogens. By introducing systematic modifications to the N-or C-terminal helices of aecesin, a cecropin-like peptide from Aedes aegypti, the team was able to enhance antimicrobial efficiency and selectivity. The resulting peptides showed potent activity against several pathogens, including Acinetobacter baumannii and methicillin-resistant Staphylococcus aureus (MRSA).

Key Takeaways:

  • The researchers introduced systematic modifications to the N-or C-terminal helices of aecesin to enhance antimicrobial efficiency and selectivity.
  • N-terminal derivatives showed greater potency compared to C-terminal modifications.
  • Peptides 2D11 and 2D12 exhibited minimum inhibitory concentrations (MICs) of 8-16 μg/mL against Acinetobacter baumannii.
  • Peptide 3E1-E3 displayed broad-spectrum activity against ESKAPE pathogens with MICs of 16-64 μg/mL.
  • Peptides 4B8-B11 demonstrated MICs of 8-32 μg/mL against most bacteria, excluding Enterococcus faecium.
  • Peptide 4B11 showed the strongest activity against MRSA strain MW2, with an MIC of 8 μg/mL.
  • Mechanistic studies revealed a membrane-disruptive mode of action, supported by propidium iodide uptake and membrane depolarization assays.
  • The peptides effectively eliminated antibiotic-induced persister cells and protected Galleria mellonella from MRSA infection.

Statistics:

  • 8-16 μg/mL: MICs of peptides 2D11 and 2D12 against Acinetobacter baumannii.
  • 16-64 μg/mL: MICs of peptide 3E1-E3 against ESKAPE pathogens.
  • 8-32 μg/mL: MICs of peptides 4B8-B11 against most bacteria.
  • 8 μg/mL: MIC of peptide 4B11 against MRSA strain MW2.

Sources:

  • "Investigations On Novel Aedesin-derived Peptides Against Eskape Pathogens." Indian Journal of Biochemistry & Biophysics, vol. 62, no. 10, 2025, pp. 1142-1149. Indian Journal of Biochemistry & Biophysics can be contacted at: Natl Inst Science Communication-niscair, Dr K S Krishnan Marg, Pusa Campus, New Delhi 110 012, India.
  • Gurunathan Baskar, St. Joseph's College of Engineering, Dept. of Biotechnologies, Chennai 600119, Tamil Nadu, India.