Related Experiment Video
Updated: Jun 20, 2026
10:43
Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes
Published on: July 19, 2022
Statistical analysis of lateral diffusion and multistate kinetics in single-molecule imaging
Satomi Matsuoka1, Tatsuo Shibata, Masahiro Ueda
1Laboratories for Nanobiology, Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan.
Biophysical Journal
|August 19, 2009
Summary
This study introduces a new method to analyze how single molecules move on cell membranes. It helps understand how molecules change states and mobility over time, crucial for cell signaling.
Area of Science:
- Cellular Biology
- Biophysics
- Quantitative Biology
Background:
- Single-molecule tracking reveals temporal variations in molecular lateral mobility on living cell membranes.
- These mobility variations suggest underlying molecular dynamics involving multiple states.
- Understanding these dynamics is essential for elucidating cell membrane signal processing mechanisms.
Purpose of the Study:
- To develop and validate a quantitative method for characterizing multiple molecular states and their transition kinetics from single-molecule trajectories.
- To analyze temporal variations in lateral mobility on cell membranes.
Main Methods:
- Utilized displacement probability density functions and autocorrelation functions of squared displacements.
- Applied the method to analyze numerically generated single-molecule trajectories.
- Tested three scenarios: single diffusion coefficient, mixture of two states, and switching between two states.
Main Results:
- The proposed method successfully distinguished between the three tested mobility scenarios.
- Accurate estimation of characteristic mobility parameters and state transition kinetics was achieved.
- Demonstrated the method's capability to analyze complex molecular behaviors.
Conclusions:
- The developed method provides a robust tool for analyzing molecular mobility and state transitions in living cells.
- Applicable to single-molecule tracking data for molecules in multiple functional states with varying lateral mobility.
- Offers insights into the mechanisms of signal processing on the cell membrane.
More Related Videos
Related Concept Videos
01:19Protein Dynamics in Living Cells
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...
01:24Protein Diffusion in the Membrane
Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...