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Related Experiment Video

Updated: Aug 14, 2025

Spot Variation Fluorescence Correlation Spectroscopy for Analysis of Molecular Diffusion at the Plasma Membrane of Living Cells

Spot Variation Fluorescence Correlation Spectroscopy for Analysis of Molecular Diffusion at the Plasma Membrane of Living Cells

Published on: November 12, 2020

Quantifying membrane binding and diffusion with fluorescence correlation spectroscopy diffusion laws.

Anita Mouttou¹, Erwan Bremaud¹, Julien Noero¹

¹Membrane Domains and Viral Assembly, Montpellier Infectious Disease Research Institute, UMR CNRS 9004, Montpellier, France.

Biophysical Journal

|January 12, 2023

Summary

This summary is machine-generated.

This study introduces a new fluorescence correlation spectroscopy (FCS) diffusion law to quantify membrane binding and diffusion of proteins in living cells. The method accurately estimates membrane partitioning and diffusion coefficients for peripheral membrane molecules.

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Area of Science:

Cellular biology
Biophysics
Microscopy

Background:

Transient protein-membrane interactions are crucial for cellular processes.
Quantifying membrane binding and diffusion in living cells is essential.
Existing fluorescence correlation spectroscopy (FCS) methods struggle with complex, non-Brownian motions.

Purpose of the Study:

To develop a novel FCS diffusion law applicable to membrane binding events.
To enable accurate quantification of membrane partitioning and diffusion dynamics.
To characterize the behavior of peripheral membrane molecules.

Main Methods:

Developed computer simulations of spot-variation FCS (svFCS) for membrane binding scenarios.
Derived an empirical diffusion law from simulation data with parameters for binding and diffusion.
Applied svFCS to study retroviral Gag proteins at lipid bilayers and cell membranes.

Main Results:

Successfully derived and validated an empirical FCS diffusion law for membrane binding.
Quantified apparent binding constant (K_D) and membrane diffusion coefficient (D_2D) for Gag proteins.
Demonstrated the method's applicability across different lipid compositions and in living cells.

Conclusions:

The proposed FCS diffusion law accurately estimates membrane partitioning and diffusion properties.
This approach provides a powerful tool for studying peripheral membrane proteins.
Enables quantitative analysis of molecular dynamics at cellular membranes.