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DNA-encircled lipid bilayers.

Katarina Iric1, Madhumalar Subramanian, Jana Oertel

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Researchers created DNA-encircled bilayers (DEBs) for studying cell membranes. These novel structures stabilize lipid bilayers, preventing vesicle formation and supporting lipid phase transitions for in vitro biophysical investigations.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Molecular Biology

Background:

  • Lipid bilayers and proteins are vital in biology.
  • In vitro studies require membrane-mimetic systems for investigating lipid phases, protein interactions, and membrane structure.
  • In vivo studies are challenging for manipulation and observation.

Purpose of the Study:

  • To develop a novel membrane-mimetic system using DNA nanotechnology.
  • To create DNA-encircled bilayers (DEBs) for in vitro biophysical investigations.
  • To enable the study of lipidic phases and membrane protein properties.

Main Methods:

  • Utilizing the programmability of DNA nanotechnology to create DEBs.
  • Synthesizing DEBs from multiple copies of alkylated oligonucleotides hybridized to a single-stranded minicircle.
  • Self-assembly of phospholipid bilayers within the DNA ring structure.

Main Results:

  • DEBs were successfully synthesized using commercially available components.
  • The DNA ring stabilizes the lipid bilayer rim, preventing vesicle formation.
  • DEBs support thermotropic lipid phase transitions and allow for tunable diameter.
  • The system is protein-free, allowing for investigation of lipidic phases and membrane proteins.

Conclusions:

  • DEBs provide a versatile and programmable platform for membrane biophysics.
  • DNA nanotechnology enables rational design of DEBs for specific research needs.
  • DEBs are a valuable tool for in vitro studies of lipidic phases and membrane protein properties.