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Optical Voltage Sensing Using DNA Origami.

Elisa A Hemmig1, Clare Fitzgerald1, Christopher Maffeo2

  • 1Cavendish Laboratory, Department of Physics , University of Cambridge , JJ Thomson Avenue , Cambridge , CB3 0HE , United Kingdom.

Nano Letters
|February 13, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed DNA origami nanodevices for optical voltage sensing. These nanodevices convert electric potential changes into optical signals, showing promise for novel biosensing applications.

Keywords:
DNA nanotechnologycoarse-grained simulationsnanocapillaryoptical voltage measurementssingle-molecule FRET

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Area of Science:

  • Nanotechnology
  • Biophysics
  • Molecular Engineering

Background:

  • DNA nanotechnology offers precise control over nanoscale structures.
  • Optical methods are crucial for non-invasive sensing.
  • Voltage sensing requires sensitive and specific detection mechanisms.

Purpose of the Study:

  • To develop novel optical voltage sensing nanodevices using DNA nanotechnology.
  • To demonstrate the conversion of local electric potential changes into optical signals.
  • To explore the tunability of voltage sensitivity in DNA nanostructures.

Main Methods:

  • Assembly of voltage-responsive DNA origami structures.
  • Labeling with Förster Resonance Energy Transfer (FRET) dyes.
  • Reversible immobilization on nanocapillary tips.
  • Application of electric fields and monitoring FRET efficiency changes.
  • Coarse-grained simulations of DNA nanostructure deformation.

Main Results:

  • Demonstrated reversible structural changes in DNA origami upon electric field application.
  • Successfully monitored applied electric fields via changes in FRET efficiency.
  • Tuned voltage sensitivity by altering dye positions within the DNA structure.
  • Simulations confirmed voltage-dependent elastic deformation and FRET pair distance changes.

Conclusions:

  • DNA origami nanostructures can function as optical voltage sensors.
  • The sensing mechanism is based on voltage-induced structural changes affecting FRET efficiency.
  • This approach offers a flexible and versatile platform for voltage sensing.
  • Potential applications include mechanical property determination and dynamic nanostructure sensing.