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This study introduces a novel DNA-based structural transformation (ST) for nanomachines. This method enables thermodynamically uphill reactions, eliminating background activity and enabling energy storage in DNA nanodevices.

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Area of Science:

  • Nanotechnology
  • Biochemistry
  • Molecular Biology

Background:

  • DNA's base-pairing rules enable bottom-up nanoscale engineering.
  • Current DNA nanomachines rely on duplex rearrangements, limiting versatility and causing background activity.
  • Thermodynamic favorability in DNA reactions drives undesired background activity.

Purpose of the Study:

  • To investigate a new approach for DNA nanomachines using structural transformation (ST).
  • To demonstrate unidirectional, nonenzymatic reactions independent of thermodynamic favorability.
  • To enable nanodevices with reduced background activity and potential energy storage.

Main Methods:

  • Designed a DNA hairpin substrate incorporating a quadruplex sequence.
  • Initiated ST reactions via toehold-mediated strand displacement triggered by a target molecule.
  • Analyzed thermodynamic principles governing ST reactions.

Main Results:

  • Demonstrated ST reactions transform stable DNA substrates into metastable quadruplex products.
  • Achieved unidirectional, nonenzymatic reactions without relying on thermodynamic favorability.
  • Showcased the ability to run nanodevices without detrimental background activity.

Conclusions:

  • Structural transformation (ST) offers a new paradigm for DNA-based nanomachines.
  • ST enables thermodynamically uphill reactions, overcoming limitations of current designs.
  • This approach allows for energy storage in nanodevices for downstream applications.