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Single-Nanoparticle Tracking with Angstrom Localization Precision and Microsecond Time Resolution.

Jun Ando1, Akihiko Nakamura1, Akasit Visootsat1

  • 1Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki, Aichi, Japan; The Graduate University for Advanced Studies, Hayama, Kanagawa, Japan.

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Researchers improved gold nanoparticle (AuNP) imaging for biomolecular motors. They achieved angstrom-level localization precision and microsecond time resolution, enabling detailed observation of motor protein dynamics.

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Area of Science:

  • Biophysics
  • Optical Microscopy
  • Nanotechnology

Background:

  • Gold nanoparticles (AuNPs) are valuable for optical imaging of biomolecules due to high scattering efficiency and photostability.
  • Existing methods offer nanometer precision and millisecond resolution, but higher resolution is needed for detailed biomolecular motor studies.

Purpose of the Study:

  • To determine the fundamental limits of localization precision with AuNPs.
  • To develop advanced microscopy techniques for enhanced single-molecule imaging of biomolecular dynamics.

Main Methods:

  • Utilized objective-lens-type total internal reflection dark-field microscopy.
  • Developed an annular illumination system with an axicon lens for high laser intensity illumination.
  • Employed high image magnification to prevent detector saturation.

Main Results:

  • Established localization precision is inversely proportional to the square root of photon number.
  • Achieved 1.3 Å precision for 40 nm AuNPs and 1.9 Å for 30 nm AuNPs at 1 ms resolution.
  • Reached 5.4 Å precision for 40 nm AuNPs and 1.7 nm for 30 nm AuNPs at 33 μs resolution.

Conclusions:

  • The study sets new benchmarks for AuNP-based imaging precision and time resolution.
  • The developed microscopy system enables unprecedented observation of biomolecular motor mechanics.
  • This advancement is crucial for understanding kinesin-1 motor protein function at the single-molecule level.