The first cyclic temporin L analogues were designed using diverse tethering strategies, establishing structure-activity relationships between α-helical content and antimicrobial, antibiofilm, and cytotoxic properties.
First-in-classcyclic temporin L analogues created using four different intramolecular tethering strategies
What the researchers found
First-in-class cyclic temporin L analogues were created using lactam, triazole, hydrocarbon, and disulfide linkers. The library revealed relationships between α-helical content and antimicrobial, antibiofilm, and cytotoxic activities.
Why it matters
Antimicrobial resistance demands new antibiotics. Cyclization solves the stability problem of natural antimicrobial peptides while the systematic structure-activity analysis provides a blueprint for optimizing future AMP candidates.
The numbers in context
3 cyclization strategies; increased α-helicity; retained broad antimicrobial activity; first cyclic temporin reported.
How the study worked
Peptide design and synthesis with four cyclization strategies. Structural characterization for α-helicity. Antimicrobial activity testing. Antibiofilm assays. Cytotoxicity evaluation. Structure-activity relationship analysis.
Who was studied
Cyclic temporin L analog library tested against bacterial panels
What this study cannot tell us
In vitro study — in vivo stability, pharmacokinetics, and therapeutic efficacy not assessed. Cyclization may alter selectivity between bacterial and human cell membranes. Manufacturing complexity increases with cyclization.
How to read the evidence
Thorough in vitro characterization with structure-activity analysis across multiple cyclization approaches. Foundational chemistry work requiring in vivo validation.
When this study was published
Published in 2021. Cyclization of antimicrobial peptides continues as an active strategy for improving peptide drug properties.
The bigger picture
The transition from linear to cyclic antimicrobial peptides represents a critical step toward clinical viability. Understanding how different cyclization methods affect both structure and function enables rational drug design in the growing field of peptide antibiotics.
Questions still open
- Which cyclization strategy provides the best balance of antimicrobial potency and safety?
- How do cyclic temporin L analogues perform in animal infection models?
- Can this systematic cyclization approach be applied to other antimicrobial peptide families?
Common questions
What is temporin L?
Why make peptides cyclic?
Read the original research
First-in-Class Cyclic Temporin L Analogue: Design, Synthesis, and Antimicrobial Assessment.
Journal of medicinal chemistry, 64(15), 11675-11694
Citation
Bellavita, Rosa; Casciaro, Bruno; Di Maro, Salvatore; Brancaccio, Diego; Carotenuto, Alfonso; Falanga, Annarita; Cappiello, Floriana; Buommino, Elisabetta; Galdiero, Stefania; Novellino, Ettore; Grossmann, Tom N; Mangoni, Maria Luisa; Merlino, Francesco; Grieco, Paolo. (2021). First-in-Class Cyclic Temporin L Analogue: Design, Synthesis, and Antimicrobial Assessment.. Journal of medicinal chemistry, 64(15), 11675-11694. https://doi.org/10.1021/acs.jmedchem.1c01033