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Related Concept Videos

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Related Experiment Video

Updated: May 13, 2025

Author Spotlight: Exploring the Antibacterial Effects of Zinc Oxide Nanoparticles in Overcoming Antibiotic Resistance
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Lipidated SNAPP-Stars Target and Kill Multidrug-Resistant Bacteria within Minutes.

Sara Hadjigol1, Sadegh Shabani2, Vianna F Jafari2

  • 1ACTV Research Group, Division of Basic and Clinical Oral Sciences, The Melbourne Dental School, Royal Dental Hospital, The University of Melbourne, 720 Swanston Street, Carlton, Melbourne, Victoria 3010, Australia.

ACS Applied Materials & Interfaces
|April 16, 2025
PubMed
Summary

Lipidation of Structurally Nanoengineered Antimicrobial Peptide Polymers (SNAPP-stars) significantly enhances antimicrobial activity against MRSA by targeting peptidoglycan. Shorter lipid chains improve efficacy, offering a rapid and biocompatible alternative to conventional antibiotics.

Keywords:
Gram-positiveSNAPP-starStaphylococcus aureusantimicrobial resistancelipopeptidemembrane activenanoengineered peptide polymer

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Area of Science:

  • Biochemistry
  • Materials Science
  • Microbiology

Background:

  • Antibiotic resistance poses a critical global health threat, necessitating novel antimicrobial strategies.
  • Few new antibiotics reach the market despite advancements in resistance research and compound synthesis.
  • Structurally Nanoengineered Antimicrobial Peptide Polymers (SNAPP-stars) represent a promising new class of antimicrobials.

Purpose of the Study:

  • To investigate the impact of lipidation on the antimicrobial activity and mechanism of SNAPP-stars.
  • To evaluate the efficacy of lipo-SNAPP-stars against Staphylococcus aureus and Methicillin-resistant Staphylococcus aureus (MRSA).
  • To determine the influence of lipid chain length on SNAPP-star antimicrobial properties and bacterial targeting.

Main Methods:

  • Synthesis and characterization of lipo-SNAPP-stars with varying fatty acid chain lengths (C6, C12, C18).
  • Antimicrobial activity assays against S. aureus and MRSA, including time-kill kinetics.
  • Microbial flow cytometry to analyze bacterial binding, membrane depolarization, and targeting mechanisms.

Main Results:

  • Lipidation of SNAPP-stars (lipo-SNAPP-stars) significantly enhanced antimicrobial activity, particularly against MRSA.
  • Lipo-SNAPP-stars demonstrated rapid bacterial killing (<1 minute) compared to vancomycin (>16 hours).
  • Activity correlated inversely with lipid chain length (C6 > C12 > C18), with shorter chains showing greater efficacy.
  • Lipidation enhanced binding to the bacterial surface via peptidoglycan and lipoteichoic acid, leading to inner membrane disruption.
  • Increased lipid length improved bacterial binding but hindered peptidoglycan penetration and inner membrane disruption.
  • Lipidation did not increase cytotoxicity, and C6-S16 exhibited an improved therapeutic index.

Conclusions:

  • Lipidation is a viable strategy to enhance SNAPP-star antimicrobial efficacy by improving bacterial surface targeting and binding to peptidoglycan.
  • Optimizing lipid chain length is crucial, as shorter chains (e.g., C6) yield superior antimicrobial activity and faster bacterial killing.
  • Lipo-SNAPP-stars, especially C6-S16, present a highly biocompatible and potent therapeutic candidate for combating MRSA infections.