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Tuning lipid layer formation on particle surfaces by using DNA-containing recruiter molecules
1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141 South Korea.
Colloids and Surfaces. B, Biointerfaces
|September 4, 2021
Summary
Researchers explored DNA conjugates for bioengineering, finding that lipid layer formation depends on DNA recruiter type and liposome concentration. Surface chemistry dictates layer structure when liposomes are in excess.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Nanotechnology
Background:
- DNA-conjugated molecules are used in bioengineering, but their interactions with biomolecules are not fully understood.
- Developing controlled biofunctional interfaces is crucial for advanced applications.
Purpose of the Study:
- To investigate the formation of supported lipid layers on DNA-immobilized gold nanoparticles.
- To understand how DNA recruiter molecules and liposome characteristics influence lipid layer morphology.
Main Methods:
- Synthesized DNA-containing recruiter molecules and immobilized them on gold nanoparticles via DNA hybridization.
- Applied liposomes of varying phospholipid compositions to study supported lipid layer formation.
- Analyzed lipid layer morphology and quantity under different liposome concentrations and surface chemistries.
Main Results:
- Lipid layer formation is dependent on liposome concentration and recruiter molecule type.
- Above a critical liposome concentration, surface chemistry dictates layer formation (multilayers on hydrophilic, monolayers on hydrophobic recruiters).
- Below critical concentration, recruiters directly interact with lipids via hydrophobic forces, modulated by liposome charge and fluidity.
Conclusions:
- The study provides quantitative insights into DNA conjugate-lipid interactions.
- A novel method for fine-tuning lipid layer formation on biofunctional surfaces is introduced.
