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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.Fatty acids tails of phospholipids can be either saturated or...

Membrane Fluidity

Membrane Fluidity

Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...

Asymmetric Lipid Bilayer

Asymmetric Lipid Bilayer

Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...

Fluid Mosaic Model

Fluid Mosaic Model

Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich with the analogy of...

Assembly of the Lipid Bilayer in the ER

Assembly of the Lipid Bilayer in the ER

Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...

Membrane Lipids

Membrane Lipids

Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
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Related Experiment Video

Updated: Jul 1, 2026

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

Published on: October 24, 2017

The liquid-ordered phase in membranes.

Peter J Quinn¹, Claude Wolf

¹Department of Biochemistry, King's College London, London, UK. p.quinn@kcl.ac.uk

Biochimica Et Biophysica Acta

|September 9, 2008

Summary

This review explores membrane domain formation, focusing on how sterols and phospholipids interact to create ordered and disordered phases. Understanding these lipid interactions is key to membrane function and permeability.

Area of Science:

Biophysics
Membrane Biology
Physical Chemistry

Background:

Lateral domain formation in biological membranes is linked to physiological processes, but mechanisms are speculative.
Biomembrane domains can be modeled in simpler lipid systems, aiding understanding of membrane phase behavior.

Purpose of the Study:

To review the principles governing phase behavior in biological membranes.
To elucidate the molecular mechanisms and structural basis of membrane domain formation.

Main Methods:

Analysis of sterol-phospholipid interactions in monomolecular films.
Thermodynamic studies of sphingomyelin-cholesterol interactions using calorimetry and densitometry.
Biophysical characterization of liquid-ordered and liquid-disordered phases using spectroscopy and X-ray scattering.

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Biomembrane Fabrication by the Solvent-assisted Lipid Bilayer (SALB) Method

Biomembrane Fabrication by the Solvent-assisted Lipid Bilayer (SALB) Method

Published on: December 1, 2015

Crystallization of Membrane Proteins in Lipidic Mesophases

Crystallization of Membrane Proteins in Lipidic Mesophases

Published on: March 28, 2011

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Last Updated: Jul 1, 2026

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

Published on: October 24, 2017

Biomembrane Fabrication by the Solvent-assisted Lipid Bilayer (SALB) Method

Biomembrane Fabrication by the Solvent-assisted Lipid Bilayer (SALB) Method

Published on: December 1, 2015

Crystallization of Membrane Proteins in Lipidic Mesophases

Crystallization of Membrane Proteins in Lipidic Mesophases

Published on: March 28, 2011

Main Results:

Sterols condense phospholipids, with effects dependent on sterol and phospholipid structure.
Sphingomyelin-cholesterol interactions exhibit specific thermodynamic properties.
Distinct structural and biophysical properties of liquid-ordered and liquid-disordered phases were characterized.

Conclusions:

The principles of lipid phase behavior are crucial for understanding membrane structure and function.
Liquid-ordered phases play a role in membrane physiology and permeability barrier properties.