Related Experiment Video
Updated: Jun 19, 2025
14:12
Dual-Color Fluorescence Cross-Correlation Spectroscopy to Study Protein-Protein Interaction and Protein Dynamics in Live Cells
Published on: December 11, 2021
5.2K
Intracellular Macromolecular Crowding within Individual Stress Fibers Analyzed by Fluorescence Correlation
Aria Buenaventura1, Takumi Saito1,2,3,4, Taiga Kanao1
1Division of Bioengineering, Osaka University, Toyonaka, 560-0043 Japan.
Cellular and Molecular Bioengineering
|July 25, 2024
Summary
Macromolecular crowding hinders protein diffusion within cells, particularly in stress fibers below the nucleus. This study used green fluorescent proteins (GFPs) to measure diffusion rates, revealing insights into cellular mechanics.
Area of Science:
- Cell Biology
- Biophysics
Background:
- Cellular component diffusion is vital for cell function.
- Macromolecular crowding's impact on diffusion is not well understood.
Purpose of the Study:
- Investigate diffusion rates in different cellular locations.
- Assess the effect of macromolecular crowding on protein diffusion.
Main Methods:
- Studied diffusion in mesenchymal cell cytoplasm and stress fibers.
- Utilized monomer, dimer, and trimer green fluorescent proteins (GFPs).
- Employed fluorescence correlation spectroscopy (FCS) to measure diffusion coefficients.
Main Results:
- Diffusion was slower in stress fibers, especially those below the nucleus.
- Macromolecular crowding appears to impede GFP diffusion.
- No significant diffusion rate difference was observed between GFP monomers, dimers, and trimers.
Conclusions:
- Protein diffusion is hindered by macromolecular crowding in cellular environments.
- Findings aid understanding of cellular responses to mechanical stress and senescence.
Related Concept Videos
01:17Studying the Cytoskeleton
5.9K
The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
5.9K
01:19Protein Dynamics in Living Cells
2.1K
Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
2.1K