How Sugar Modifications Change Antimicrobial Peptide Structure, Stability, and Activity | Research

The takeaway

N- and O-glycosylation of antimicrobial peptides systematically altered their structural properties, stability, and biological activity, providing design rules for glycoengineered AMP therapeutics.

Design rules mapped
First systematic comparison of how N- vs O-glycosylation affects antimicrobial peptide properties, enabling rational glycoengineering

What the researchers found

N- and O-glycosylation differentially affected AMP structural properties, stability, and biological activity, providing systematic design rules for glycoengineered antimicrobial peptide therapeutics.

Why it matters

AMPs are promising antibiotics but unstable in the body. Glycosylation can fix this, and knowing which type to use is crucial for drug development.

How the study worked

Synthesis and characterization of O- and N-glycosylated AMP variants with structural (CD, NMR), stability (protease resistance), and functional (antimicrobial activity) analysis.

What this study cannot tell us

Limited to specific AMP sequences. Effects may vary for different peptide scaffolds. In vivo validation needed.

How to read the evidence

Systematic structure-activity study with comprehensive characterization. Foundational for glyco-AMP design.

When this study was published

Published in 2025.

The bigger picture

Glycoengineering is becoming a standard tool for optimizing peptide drugs. This study provides the first systematic comparison for AMPs specifically.

Questions still open

Which glycosylation strategy best improves protease resistance while maintaining antimicrobial activity?
Can glycosylation reduce AMP hemolytic toxicity?
Would glycosylated AMPs show improved in vivo efficacy?

Common questions

What is glycosylation?

Glycosylation means attaching sugar molecules to a peptide. For antimicrobial peptides, this can improve stability (so they last longer in the body) and change how well they kill bacteria.

Why does the type of sugar attachment matter?

N-glycosylation and O-glycosylation attach sugars differently, producing distinct effects on peptide shape, stability, and activity. Knowing which to use enables precise optimization of peptide drugs.

Read the original research

Influence of N- and O-glycosylation on structural properties and biological activity of a C-terminal LL-37 fragment.

Carbohydrate research, 563, 109872

View on PubMed ↗Publisher’s paper ↗

Citation

Grzywacz, Daria; Nuti, Francesca; Żamojć, Krzysztof; Samsonov, Sergey A; Malinowska, Marcelina; Paduszyńska, Małgorzata; Papini, Anna Maria; Makowska, Joanna. (2026). Influence of N- and O-glycosylation on structural properties and biological activity of a C-terminal LL-37 fragment.. Carbohydrate research, 563, 109872. https://doi.org/10.1016/j.carres.2026.109872