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Preparation of Multifunctional Silk-Based Microcapsules Loaded with DNA Plasmids Encoding RNA Aptamers and Riboswitches
Published on: October 8, 2021
Programmable assembly of DNA-functionalized liposomes by DNA
1Department of Chemistry, Waterloo Institute for Nanotechnology, University Of Waterloo, Waterloo, Ontario, N2L 3G1, Canada.
ACS Nano
|January 15, 2011
Summary
Researchers explored DNA-linked liposomes for programmable assembly, finding they exhibit sharp melting transitions similar to gold nanoparticles (AuNPs). This DNA-directed assembly of soft nanoparticles offers new possibilities in bionanotechnology.
Area of Science:
- Bionanotechnology
- Materials Science
- Biophysics
Background:
- Bionanotechnology utilizes biomolecules to engineer nanomaterials.
- DNA-directed assembly is well-studied for inorganic nanoparticles like gold nanoparticles (AuNPs).
- Systematic studies on DNA-linked soft nanoparticles, such as liposomes, are limited.
Purpose of the Study:
- To investigate the programmable assembly of DNA-linked liposomes.
- To systematically characterize DNA-linked liposomes and compare their assembly to AuNPs.
- To explore the influence of various parameters on liposome assembly and DNA melting behavior.
Main Methods:
- DNA-directed assembly of liposomes with varying sizes, charges, fluidities, and compositions.
- Systematic characterization of DNA-linked liposomes under different DNA spacer lengths, linker sequences, and salt concentrations.
- Cryo-transmission electron microscopy (Cryo-TEM) for structural analysis.
- Differential scanning calorimetry (DSC) to analyze melting transitions.
Main Results:
- Programmable assembly of DNA-linked liposomes was achieved.
- Liposomes exhibited sharp melting transitions (fwhm ≤ 1 °C), enabling sequence-specific DNA detection, analogous to AuNPs.
- Liposome size, charge, and fluidity showed minimal impact on DNA melting temperature.
- Cryo-TEM confirmed programmable assemblies with most liposomes retaining spherical shape.
- Key differences between liposome and AuNP assemblies were observed and attributed to distinct physical properties.
Conclusions:
- DNA-linked liposomes represent a viable platform for programmable self-assembly.
- The observed DNA melting behavior allows for sequence-specific detection, similar to inorganic nanoparticles.
- Understanding the physical property differences between soft and inorganic nanoparticles is crucial for optimizing DNA-directed assembly applications.
