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Related Experiment Videos

Spatially resolved total internal reflection fluorescence correlation microscopy using an electron multiplying

Balakrishnan Kannan1, Lin Guo, Thankiah Sudhaharan

  • 1Department of Chemistry, 3, Science Drive 3, National University of Singapore, Singapore 117543.

Analytical Chemistry
|May 11, 2007
PubMed
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A new spatially resolved total internal reflection fluorescence correlation microscopy (TIR-FCM) system enables precise measurement of molecular diffusion. This advanced microscopy technique accurately determines diffusion coefficients for lipids and proteins on cell membranes.

Area of Science:

  • Biophysics
  • Cell Biology
  • Microscopy

Background:

  • Understanding molecular dynamics on cell membranes is crucial for cellular function.
  • Existing microscopy techniques have limitations in spatial resolution and temporal accuracy for membrane studies.

Purpose of the Study:

  • To develop and validate a spatially resolved total internal reflection fluorescence correlation microscopy (TIR-FCM) system.
  • To measure diffusion coefficients of lipids and proteins in cell membranes with high spatiotemporal resolution.

Main Methods:

  • Construction of a TIR-FCM system utilizing an electron multiplying charge-coupled device (EMCCD) camera.
  • Determination of diffusion coefficients for lipid molecules in planar lipid bilayers.
  • Analysis of lipids and epidermal growth factor receptor (EGFR) proteins on Chinese Hamster Ovary (CHO) cell membranes.

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Main Results:

  • The system achieved a time resolution of 4 ms, suitable for membrane dynamics.
  • Simultaneous measurement of 1600 autocorrelation functions with a 4.8 ms time resolution was demonstrated.
  • Evaluation of "cross talk" indicated potential for higher multiplexing than previously reported.

Conclusions:

  • The developed TIR-FCM system offers enhanced spatiotemporal resolution for studying membrane dynamics.
  • The system is capable of measuring diffusion in lipid bilayers and membrane proteins in living cells.
  • The findings suggest improved multiplexing capabilities for future microscopy applications.