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Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells
Published on: December 11, 2021
Multi-confocal fluorescence correlation spectroscopy
Remi Galland1, Jie Gao, Meike Kloster
1Universite de Grenoble 1, CNRS, Laboratoire de Spectrometrie Physique UMR 5588, BP 87, Saint Martin d'Heres, France.
Frontiers in Bioscience (Elite Edition)
|January 4, 2011
Summary
We developed a multi-confocal Fluorescence Correlation Spectroscopy (mFCS) technique using a Spatial Light Modulator (SLM) and EM-CCD camera. This method enables rapid, high-resolution molecular dynamics studies in living cells.
Area of Science:
- Biophysics
- Cell Biology
- Optical Microscopy
Background:
- Fluorescence Correlation Spectroscopy (FCS) is a powerful technique for studying molecular dynamics.
- Standard confocal setups can be limited in speed and throughput for complex biological systems.
Purpose of the Study:
- To introduce and validate a novel multi-confocal Fluorescence Correlation Spectroscopy (mFCS) technique.
- To enhance the speed and efficiency of FCS measurements for biological applications.
Main Methods:
- Integration of a Spatial Light Modulator (SLM) to generate multiple laser spots.
- Utilizing an Electron Multiplying-CCD (EM-CCD) camera with pixels acting as virtual pinholes.
- Employing spherical wave approximation for phase map calculation to create diffraction-limited spots.
Main Results:
- Achieved a time resolution of 100 microseconds in the fastest acquisition mode.
- Demonstrated comparable observation volumes to standard confocal setups using sulforhodamine G solutions.
- Successfully applied mFCS to study G-actin dynamics in mouse embryonic fibroblasts and HSF1 dynamics in H1299 cells during heat shock.
Conclusions:
- The developed mFCS technique offers high temporal resolution and sensitivity for molecular dynamics.
- This method is effective for analyzing protein dynamics and interactions within living cells.
- mFCS provides a valuable tool for advancing biophysical and cell biology research.
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