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Lipidated DNA Nanostructures Target and Rupture Bacterial Membranes
Isabel D Bennett1,2, Jonathan R Burns3, Maxim G Ryadnov4,5
1London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London, WC1H 0AH, United Kingdom.
Small (Weinheim an Der Bergstrasse, Germany)
|June 6, 2024
Summary
Cholesterol-tagged DNA nanostructures selectively kill bacteria by disrupting their membranes. This discovery offers a novel strategy against antimicrobial resistance using targeted nanomaterial design.
Area of Science:
- Biomedical chemistry
- Nanotechnology
- Microbiology
Background:
- Supramolecular nanostructures can be engineered for biomedical applications.
- Bacterial membranes differ in cholesterol content from eukaryotic membranes.
Purpose of the Study:
- To investigate cholesterol-tagged DNA nanostructures as antibacterial agents.
- To determine the mechanism of bacterial membrane disruption by these nanostructures.
Main Methods:
- Synthesis of cholesterol-modified DNA nanostructures.
- Testing nanostructure binding affinity to bacterial and eukaryotic membranes.
- Microscopy and biochemical assays to elucidate the cell death mechanism.
Main Results:
- Lipidated DNA nanostructures selectively bind to cholesterol-free bacterial membranes.
- Nanostructures induce bacterial cell death through membrane rupture.
- Bacterial killing is mediated by clusters of nanostructures adhering to the membrane.
Conclusions:
- Cholesterol-tagged DNA nanostructures represent a promising antibacterial strategy.
- The findings suggest a mechanism of membrane disruption independent of traditional pore formation.
- This research could lead to new antibacterial agents to combat antimicrobial resistance.
