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Related Experiment Video

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Author Spotlight: Single-Molecule Surface-Enhanced Raman Scattering Measurements Enabled by Plasmonic DNA Origami Nanoantennas
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Plasmon-Enhanced Single-Molecule Enzymology.

Yuyang Wang1, Peter Zijlstra1

  • 1Molecular Biosensing for Medical Diagnostics, Faculty of Applied Physics, and Institute for Complex Molecular Systems, Eindhoven University of Technology, PO Box 513, 5600 MB, Eindhoven, The Netherlands.

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|August 28, 2018
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Summary

Plasmon enhancement significantly boosts single-molecule enzymology signal-to-noise ratio (SNR) by up to 100-fold. This method optimizes enzyme studies by improving fluorescence detection, aiding in understanding molecular heterogeneity.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Biochemistry

Background:

  • Single-molecule enzymology enables detailed study of enzyme kinetics and heterogeneity.
  • Plasmonic nanoparticles offer unique optical properties for enhancing fluorescence signals.
  • Current methods face limitations in signal-to-noise ratio (SNR) for detecting single enzymatic turnovers.

Purpose of the Study:

  • To numerically investigate plasmon-enhanced fluorescence signals in single-molecule enzymology.
  • To quantify the signal enhancement achievable using plasmonic particles conjugated to enzymes.
  • To provide guidelines for optimizing SNR in single-molecule enzyme studies.

Main Methods:

  • Combined Brownian dynamics and electromagnetic simulations.
  • Modeled fluorescent product diffusion away from enzyme active site.
  • Calculated photon detection rates considering plasmon coupling effects on excitation and emission.

Main Results:

  • Plasmon enhancement can increase SNR of single enzyme turnovers by up to 100-fold compared to confocal microscopy.
  • Achieved enhancement is a balance between reduced near-field residence time and increased emission intensity.
  • Enhancement is dependent on particle characteristics (size, shape, material) and fluorophore properties.

Conclusions:

  • Plasmon-enhanced single-molecule enzymology offers a significant improvement in signal detection.
  • The study provides a framework for designing plasmonic systems to maximize SNR.
  • Findings can advance the understanding and quantification of enzyme dynamics and heterogeneity at the single-molecule level.