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Atomic Emission Spectroscopy: Instrumentation01:22

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Using Three-color Single-molecule FRET to Study the Correlation of Protein Interactions
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Inexpensive electronics and software for photon statistics and correlation spectroscopy.

Benjamin D Gamari1, Dianwen Zhang1, Richard E Buckman1

  • 1Department of Physics, University of Massachusetts, Amherst, Massachusetts 01002.

American Journal of Physics
|March 1, 2016
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Summary
This summary is machine-generated.

This study introduces affordable electronics and open-source software to bring advanced single-molecule spectroscopy techniques, like fluorescence correlation spectroscopy (FCS), into undergraduate biophysics teaching labs, enabling hands-on research experience.

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Area of Science:

  • Biophysics
  • Materials Science
  • Spectroscopy

Background:

  • Single-molecule sensitive microscopy and spectroscopy are advanced research tools.
  • Techniques like fluorescence correlation spectroscopy (FCS) and fluorescence resonance energy transfer (FRET) are common in research but not teaching labs.
  • A gap exists in providing undergraduates with access to state-of-the-art single-molecule research capabilities.

Purpose of the Study:

  • To bridge the gap between research and teaching laboratories for single-molecule spectroscopy.
  • To make advanced biophysical research techniques accessible to undergraduate students.
  • To develop inexpensive, open-source solutions for single-molecule sensitive measurements.

Main Methods:

  • Development of inexpensive, FPGA-based electronics for single-molecule spectroscopy.
  • Creation of open-source software to accompany the hardware.
  • Implementation of fluorescence correlation spectroscopy (FCS) for data acquisition and analysis.
  • Demonstration using a protein hydrodynamic radius measurement.

Main Results:

  • The developed system provides state-of-the-art research capabilities at an accessible cost.
  • The system features 8 ns timing resolution, controls up to four lasers, and collects data from four detectors.
  • A successful demonstration of FCS for measuring protein hydrodynamic radius suitable for teaching was achieved.
  • The FPGA electronics are easy to construct and adaptable for advanced applications.

Conclusions:

  • Inexpensive electronics and open-source software can effectively bring advanced single-molecule spectroscopy into undergraduate teaching laboratories.
  • This approach enhances biophysics education by providing practical research experience.
  • The system is versatile and suitable for both introductory teaching and more advanced research applications.