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Parallel multispot smFRET analysis using an 8-pixel SPAD array.

A Ingargiola1, R A Colyer2, D Kim3

  • 1Dipartimento Elettronica ed Informazione, Politecnico di Milano, Milan, Italy ; Department of Chemistry & Biochemistry, UCLA, Los Angeles, CA USA.

Proceedings of Spie--The International Society for Optical Engineering
|January 3, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a novel multispot excitation method for single-molecule Förster resonance energy transfer (smFRET) to accelerate data acquisition. This technique enables high-throughput analysis of biomolecular dynamics by reducing measurement times.

Keywords:
FRETSPAD arrayhigh throughputphoton countingsingle-molecule

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Area of Science:

  • Biophysics
  • Spectroscopy
  • Molecular Biology

Background:

  • Single-molecule Förster resonance energy energy transfer (smFRET) measures nanometer-scale distances in biomolecules.
  • Current smFRET methods require low concentrations, leading to long acquisition times and limiting dynamic range.
  • Studying freely diffusing molecules offers advantages but faces challenges in data acquisition speed.

Purpose of the Study:

  • To develop a faster smFRET method for analyzing biomolecular interactions and conformations.
  • To overcome the limitations of long acquisition times in conventional smFRET.
  • To enable high-throughput smFRET analysis of freely diffusing molecules.

Main Methods:

  • A novel two-color smFRET approach utilizing multispot excitation (4 spots) and detection.
  • Employing a custom 8-pixel SPAD array for simultaneous donor and acceptor fluorescence collection.
  • Acquisition parallelization to increase data acquisition rates at low sample concentrations.

Main Results:

  • The multispot smFRET method achieved identical FRET efficiency values compared to single-spot methods.
  • Acquisition times were significantly reduced, enabling faster data collection.
  • Demonstrated successful smFRET measurements on DNA samples with varying fluorophore distances.

Conclusions:

  • The developed multispot smFRET technique significantly accelerates data acquisition.
  • This advancement facilitates high-throughput analysis of biomolecular dynamics in freely diffusing systems.
  • The method provides a powerful tool for studying molecular interactions and conformations with improved efficiency.