Macrocyclic hairpin mimetics of the antimicrobial peptide protegrin I showed broad-spectrum antibiotic activity including against drug-resistant bacteria, with improved stability over linear peptide antibiotics.
Broad-spectrum + stableMacrocyclic protegrin analogs killed resistant bacteria AND maintained activity in challenging conditions — addressing both efficacy and stability
What the researchers found
Macrocyclic hairpin mimetics of protegrin I demonstrated broad-spectrum antibacterial activity including against resistant strains, with improved stability over linear peptide antibiotics and activity maintained in challenging conditions.
Why it matters
Antibiotic resistance is a global health emergency. Converting natural antimicrobial peptides into stable macrocyclic drugs could generate urgently needed new antibiotic classes.
How the study worked
In-vitro antimicrobial study. Macrocyclic protegrin analogs synthesized and tested against panels of gram-positive and gram-negative bacteria, including resistant strains. Activity in serum and salt conditions assessed.
What this study cannot tell us
In-vitro activity. In-vivo efficacy, pharmacokinetics, and toxicity not assessed. Cost of macrocyclic peptide manufacturing may limit clinical development.
How to read the evidence
Preliminary in-vitro evidence with broad-spectrum activity data and stability assessment, demonstrating a viable new antibiotic approach.
When this study was published
Published in 2002. Macrocyclic antimicrobial peptide mimetics have advanced significantly, with some entering clinical development.
The bigger picture
Natural antimicrobial peptides are effective but unstable. Making them macrocyclic preserves activity while dramatically improving drug properties — a general strategy for the entire antimicrobial peptide field.
Questions still open
- Can macrocyclic protegrin analogs treat systemic bacterial infections?
- What is the toxicity profile of these compounds?
- Could this approach be applied to other antimicrobial peptide families?
Common questions
Can we make better antibiotics from natural peptides?
Do these work against superbugs?
Read the original research
Macrocyclic hairpin mimetics of the cationic antimicrobial peptide protegrin I: a new family of broad-spectrum antibiotics.
Chembiochem : a European journal of chemical biology, 3(11), 1126-33
Citation
Shankaramma, Sasalu C; Athanassiou, Zafiria; Zerbe, Oliver; Moehle, Kerstin; Mouton, Carole; Bernardini, Francesca; Vrijbloed, Jan W; Obrecht, Daniel; Robinson, John A. (2002). Macrocyclic hairpin mimetics of the cationic antimicrobial peptide protegrin I: a new family of broad-spectrum antibiotics.. Chembiochem : a European journal of chemical biology, 3(11), 1126-33.