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Area of Science:

  • Biophysics
  • Materials Science
  • Nucleic Acid Chemistry

Background:

  • Gapped DNA (GDNA) constructs, with linked rigid duplexes, form liquid crystalline (LC) phases, enabling DNA interaction studies.
  • Locked nucleic acid (LNA) base pairs (LNA-DNA or LNA-LNA) offer greater stability than DNA-DNA pairs due to improved hydrogen bonding and base stacking.
  • Smectic LC phase formation in concentrated GDNA solutions depends critically on terminal base pair stability and inter-duplex stacking.

Purpose of the Study:

  • To quantify the effect of single LNA modifications in terminal base pairs on the thermal stability of GDNA-based smectic LC phases.
  • To compare the impact of LNA-DNA base pairs versus DNA-DNA base pairs on LC phase stability.
  • To investigate the stacking interactions of LNA-modified base pairs.

Main Methods:

  • Utilized temperature-resolved synchrotron small-angle X-ray scattering (SAXS) measurements.
  • Quantified the thermal stability of smectic LC phases in GDNA solutions with varying terminal base pair compositions.
  • Analyzed the impact of LNA-DNA (A+T) terminal base pairing compared to DNA-DNA and GC base pairing.

Main Results:

  • LNA-DNA terminal AT base pairing increased the smectic LC phase stability by approximately 9-18 °C compared to DNA-DNA pairing.
  • This stability increase is less pronounced than the up to 30 °C increase observed when replacing AT DNA-DNA pairs with GC pairs.
  • Indicates weaker stacking interactions between A+T LNA-DNA base pairs than between unmodified GC base pairs.

Conclusions:

  • Demonstrates the sensitivity of LC ordering in dense DNA solutions to single nucleotide modifications.
  • LNA modifications offer a tunable mechanism for enhancing the stability of nucleic acid-based materials.
  • Highlights the potential of LNA modifications in designing advanced DNA-based LC materials.