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Membrane Fluidity

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.

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Updated: Oct 28, 2025

Monitoring Changes in Membrane Polarity, Membrane Integrity, and Intracellular Ion Concentrations in Streptococcus pneumoniae Using Fluorescent Dyes

Monitoring Changes in Membrane Polarity, Membrane Integrity, and Intracellular Ion Concentrations in Streptococcus pneumoniae Using Fluorescent Dyes

Published on: February 17, 2014

Fluorescence Polarization (FP) Assay for Measuring Staphylococcus aureus Membrane Fluidity.

Kiran B Tiwari¹, Suranjana Sen², Craig Gatto¹

¹School of Biological Sciences, Illinois State University, Normal, IL, USA.

Methods in Molecular Biology (Clifton, N.J.)

|July 15, 2021

Summary

This study details a method to measure membrane fluidity in Staphylococcus aureus using fluorescence polarization and the dye diphenylhexatriene. This technique helps understand how bacterial membranes adapt to stress by altering fatty acid composition.

Keywords:

Anisotropy Fluorescence Membrane fluidity Polarization Staphylococcus aureus

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Monitoring Changes in Membrane Polarity, Membrane Integrity, and Intracellular Ion Concentrations in Streptococcus pneumoniae Using Fluorescent Dyes

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Published on: March 14, 2021

Gramicidin-based Fluorescence Assay; for Determining Small Molecules Potential for Modifying Lipid Bilayer Properties

Gramicidin-based Fluorescence Assay; for Determining Small Molecules Potential for Modifying Lipid Bilayer Properties

Published on: October 13, 2010

Area of Science:

Microbiology
Biophysics
Biochemistry

Background:

Membrane fluidity is crucial for bacterial function and is influenced by lipid bilayer packing.
Staphylococcus aureus alters its membrane fatty acid composition (straight-chain vs. branched-chain) in response to environmental stresses.

Purpose of the Study:

To describe a method for determining membrane fluidity in Staphylococcus aureus.
To utilize fluorescence polarization for assessing bacterial membrane biophysical properties.

Main Methods:

Employing fluorescence polarization with a hydrophobic fluorescent dye (diphenylhexatriene).
Using a spectrofluorometer to measure polarized light interactions with dye-labeled bacterial membranes.
Analyzing the polarization of emitted light to quantify membrane fluidity.

Main Results:

The study outlines a reproducible method for membrane fluidity determination in S. aureus.
Diphenylhexatriene is confirmed as a suitable fluorescent probe for this application.

Conclusions:

Fluorescence polarization provides a valuable tool for investigating Staphylococcus aureus membrane dynamics.
Understanding membrane fluidity adaptations is key to deciphering bacterial stress responses.