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Mechanical Constraints Promote Noncanonical Base-Pairing Interactions.

Na Wu1, Liqiong Niu1, Jia Liu2

  • 1Institute of Analytical Chemistry and Instrument for Life Science, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P.R. China.

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Mechanical forces influence DNA and RNA base interactions. A new DNA origami nanobender system reveals how these forces promote noncanonical base pairing, expanding our understanding of molecular recognition and enabling new material assembly applications.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Nanotechnology

Background:

  • Mechanical forces are crucial regulators of cellular processes, including transcriptional regulation.
  • Existing methods have limitations in precisely studying mechanical influences on nucleobase interactions.

Purpose of the Study:

  • To develop and utilize a novel DNA origami-based nanobender system to investigate base-base interactions under tunable mechanical constraints.
  • To elucidate the mechanisms by which mechanical forces modulate nucleobase interactions and hybridization thermodynamics.

Main Methods:

  • Development of a DNA origami nanobender system to apply controlled geometric and mechanical forces to single-stranded DNA/RNA.
  • Detection of DNA origami dimerization to assess weak base interactions.
  • Integration of experimental data with molecular dynamics simulations.

Main Results:

  • Mechanical constraints were shown to promote stacking-driven noncanonical base pairing through entropy compensation and favorable nucleobase orientation.
  • The nanobender system allows for the investigation of hybridization thermodynamics across various nucleic acid types (DNA-DNA, RNA-RNA, DNA-RNA) and modified nucleotides.
  • Entropy modulation via mechanical constraints offers a method for fine-tuning binding free energy.

Conclusions:

  • Mechanical forces play a significant role in diversifying base recognition and stabilizing noncanonical pairings.
  • The nanobender system provides a powerful tool for studying nucleic acid interactions under mechanical stress.
  • Mechanical modulation of binding free energy has implications for advanced material assembly and environmental sensing applications.