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Locked Nucleic Acid Modification for Base-Stacking Engineering of Self-Assembled DNA Crystals.

Jielin Chen1,2, Mingqiang Li1, Ziyu Li1

  • 1State Key Laboratory of Synergistic Chem-Bio Synthesis, School of Chemistry and Chemical Engineering, New Cornerstone Science Laboratory, Frontiers Science Center for Transformative Molecules, Zhang Jiang Institute for Advanced Study and National Center for Translational Medicine, Shanghai Jiao Tong University, Shanghai, 200240, China.

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Locked nucleic acid (LNA) modifications fine-tune DNA base-stacking interactions, enhancing DNA crystal self-assembly. This strategy improves interstrand affinity and controls crystal growth for advanced DNA nanotechnology.

Keywords:
CrystallizationDNA crystalDNA nanotechnologyLocked nucleic acidNucleobase chemical modification

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Area of Science:

  • Biochemistry
  • Materials Science
  • Nanotechnology

Background:

  • DNA hybridization relies on Watson-Crick pairing and base-stacking interactions.
  • Existing methods for DNA assembly control include sequence engineering and chemical modifications.
  • The role of base-stacking interactions in DNA assembly remains underexplored.

Purpose of the Study:

  • To investigate the use of locked nucleic acid (LNA) modifications to program DNA crystal growth.
  • To explore LNA's potential in fine-tuning base-stacking interactions for DNA assembly.
  • To establish a quantitative framework for structure-energy relationships in DNA base-stacking.

Main Methods:

  • Strand displacement kinetics assays.
  • Molecular dynamics simulations.
  • Small-angle X-ray scattering (SAXS) analysis.

Main Results:

  • LNA modifications decrease base-pair spacing and enhance base-stacking energy.
  • Improved interstrand affinity and accelerated hybridization rates were observed.
  • Demonstrated anisotropic growth and morphological control in self-assembled DNA crystals.

Conclusions:

  • LNA-based base-stacking engineering offers precise control over DNA crystal formation.
  • This approach enhances control in structural DNA nanotechnology.
  • Provides mechanistic insights for developing dynamic DNA nanosystems.