Self-derived structure-disrupting peptides targeting methionine aminopeptidase in pathogenic bacteria: a new strategy...

Area of Science:

• Microbiology
• Biochemistry
• Drug Discovery

Background:

• Bacterial infections pose a significant threat, particularly to vulnerable populations.
• The rise of multi-drug-resistant (MDR) bacteria presents a critical global health challenge.
• Existing antibiotic pipelines are insufficient to combat emerging MDR pathogens.

Purpose of the Study:

• To explore a novel antibiotic discovery pathway using self-targeting, structure-disrupting peptides.
• To investigate the efficacy of peptides targeting essential bacterial enzymes.
• To develop new strategies against MDR bacterial infections.

Main Methods:

• Design and synthesis of helical peptides derived from bacterial enzymes.
• Assessment of peptide-induced disruption of enzyme secondary and tertiary structures.
• Evaluation of peptide activity against pathogenic bacteria, including MDR strains.
• Computational analysis to predict peptide-target interactions.
• Testing peptide efficacy in a human cervical epithelial cell model for Neisseria gonorrhoeae.

Main Results:

• A peptide, KFF-EcH3, derived from Escherichia coli methionine aminopeptidase, disrupted the enzyme's structure and killed bacteria, including MDR strains.
• No detectable resistance developed against the KFF-EcH3 peptide.
• Computational analysis confirmed KFF-EcH3's strong interaction with the enzyme's core.
• A second peptide, KFF-NgH1, targeting Neisseria gonorrhoeae methionine aminopeptidase, inhibited bacterial growth and treated infection in a cell model.

Conclusions:

• Self-derived, structure-disrupting peptides represent a promising new paradigm for antibiotic discovery.
• This strategy can be adapted to target essential proteins in various pathogenic bacteria.
• The approach offers a potential solution to the growing threat of antibiotic resistance.