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Antimicrobial Peptide C14R Kills All Six ESKAPE Pathogen Species

RPEP-152302026Gruber, Daniel; Vogel, Verena; Walter, Jan-Christoph; Bolotnikov, Grigory; Rodríguez, Armando; Preising, Nico; Ständker, Ludger; Firacative, Carolina; Spellerberg, Barbara; Kissmann, Ann-Kathrin; Rosenau, Frank
evidence
The takeaway

The synthetic pore-forming peptide C14R showed broad-spectrum antibacterial activity against all species of the ESKAPE pathogen group, the most clinically dangerous drug-resistant bacteria.

All 6 ESKAPE covered

C14R is one of the few AMPs effective against every species in the ESKAPE pathogen group

What the researchers found

Synthetic AMP C14R demonstrated broad-spectrum pore-forming antibacterial activity against all pathogenic species of the ESKAPE group.

Why it matters

ESKAPE pathogens cause the majority of hospital-acquired infections and resist most antibiotics. A single peptide effective against all six is rare and valuable.

How the study worked

Antimicrobial activity testing of C14R against all ESKAPE pathogen species with mechanism of action characterization.

What this study cannot tell us

Specific MIC values and in vivo data from abstract limited. Serum stability and toxicity need characterization.

How to read the evidence

In vitro characterization against clinical pathogen panel. Important breadth but needs PK and in vivo validation.

When this study was published

Published in 2025.

The bigger picture

Broad ESKAPE coverage by a single AMP is unusual and positions C14R as a versatile lead for hospital-acquired infection treatment.

Questions still open

  • What are the specific MIC values against each ESKAPE species?
  • Does C14R maintain activity in serum/physiological conditions?
  • Would C14R be effective in animal infection models?

Common questions

What are ESKAPE pathogens?
ESKAPE is an acronym for six of the most dangerous drug-resistant hospital bacteria. C14R is notable because it kills all six species — most antibiotics (including many AMPs) only work against some of them.
How does C14R kill bacteria?
It forms pores (holes) in bacterial membranes, causing the bacteria to lose their contents and die. This membrane-disrupting mechanism makes resistance development very difficult.

Read the original research

The Antimicrobial Peptide C14R Is Active Against All Pathogenic Species of the ESKAPE Group.

Antibiotics (Basel, Switzerland), 15(2)

View on PubMed ↗Publisher’s paper ↗

Citation

Gruber, Daniel; Vogel, Verena; Walter, Jan-Christoph; Bolotnikov, Grigory; Rodríguez, Armando; Preising, Nico; Ständker, Ludger; Firacative, Carolina; Spellerberg, Barbara; Kissmann, Ann-Kathrin; Rosenau, Frank. (2026). The Antimicrobial Peptide C14R Is Active Against All Pathogenic Species of the ESKAPE Group.. Antibiotics (Basel, Switzerland), 15(2). https://doi.org/10.3390/antibiotics15020211