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Controlling the Hierarchical Assembly of DNA-Based Hexagonal Microstructures.

Tetsunao Makino1, Takashi Kajitani2, Makiko Tanaka1

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Researchers controlled DNA assembly morphology using heating and cooling. Hierarchical liquid crystalline DNA structures like tubes and frames were formed by varying DNA strand length and overhang sequences.

Keywords:
DNADNA nanotechnologyliquid crystalself‐assembly

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Area of Science:

  • Biomolecular self-assembly
  • DNA nanotechnology
  • Liquid crystalline materials

Background:

  • Hierarchical self-assembly of DNA is crucial for advanced nanomaterials.
  • Controlling morphology in DNA liquid crystals remains a challenge.
  • Understanding DNA interactions in solution is key for predictable assembly.

Purpose of the Study:

  • To investigate the controlled morphology of hierarchical liquid crystalline DNA assemblies.
  • To explore how DNA strand length and overhang sequences influence assembly structures.
  • To elucidate the mechanisms behind the formation of DNA tubes and hexagonal frames.

Main Methods:

  • Heating and slow cooling of double-stranded DNA (dsDNA) solutions.
  • Utilizing poly(ethylene glycol) (PEG) and salt solutions to induce self-assembly.
  • Employing X-ray scattering measurements to analyze the liquid crystalline structures.
  • Varying dsDNA lengths (25mer and 18mer) and overhang sequences (AA/TT, GG/CC).

Main Results:

  • Spontaneous formation of micro-sized hexagonal DNA platelets.
  • Addition of shorter dsDNA (18mer) with AA/TT overhangs resulted in molecular tubes with central blockages.
  • Addition of 18mer dsDNA with GG/CC overhangs formed hexagonal frames.
  • X-ray scattering confirmed hexagonal columnar liquid crystalline phases for both tubes and frames.
  • 18mer DNA localized at edges, 25mer DNA formed central nuclei.

Conclusions:

  • Hierarchical DNA assemblies can be controllably formed by manipulating DNA length and overhang sequences.
  • Depletion attraction (PEG) and end-to-end stacking of dsDNA overhangs drive self-assembly.
  • Differential melting temperatures enable stepwise hierarchical assembly.
  • Overhang sequence variations dictate assembly morphology by altering growth direction.