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Tight single-stranded DNA knots

H Wang1, S M Du, N C Seeman

  • 1Department of Chemistry, New York University, NY 10003.

Journal of Biomolecular Structure & Dynamics
|April 1, 1993
PubMed
Summary
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Researchers synthesized trefoil and figure-8 DNA knots by adjusting linker lengths. Shorter linkers create tighter DNA knots, impacting their gel electrophoresis mobility and surface area.

Area of Science:

  • Synthetic DNA nanotechnology
  • Molecular topology
  • Biophysical chemistry

Background:

  • DNA nanotechnology enables the construction of complex molecular architectures.
  • Knot theory provides a framework for understanding the topology of DNA molecules.
  • Understanding DNA knot properties is crucial for DNA-based materials and nanodevices.

Purpose of the Study:

  • To synthesize and characterize trefoil (3(1)) and figure-8 (4(1)) DNA knots.
  • To investigate the relationship between linker length and knot tightness.
  • To analyze the physical properties of synthesized DNA knots, including their electrophoretic mobility and surface area.

Main Methods:

  • DNA synthesis of molecules with two single-turn helical domains and oligodeoxythymidine linkers.

Related Experiment Videos

  • Knot formation by minimizing linker lengths.
  • Gel electrophoresis on denaturing gels to analyze molecular mobility.
  • Ferguson analysis to determine surface area dependence on length.

    • Main Results:

    • Successfully synthesized trefoil and figure-8 DNA knots from the same precursor molecule.
    • Determined the shortest linker lengths for readily forming trefoil (7 nucleotides) and figure-8 (6 nucleotides) knots.
    • Observed conventional logarithmic dependence of mobility on length and linear dependence of surface area on length.
    • Identified the 80-mer trefoil knot as the tightest molecule restricted in both domains.

    Conclusions:

    • DNA knot synthesis is achievable by controlling linker lengths in designed DNA molecules.
    • Knot tightness and physical properties are directly influenced by linker length.
    • The findings contribute to the understanding of DNA knot formation and characterization for potential applications in nanotechnology.