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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...

Fluid Mosaic Model

Fluid Mosaic Model

The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.LipidsThe most...

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%...

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...

Mechanisms of Membrane Domain Formation

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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...

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Related Experiment Video

Updated: Jun 18, 2026

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

Published on: July 22, 2015

Liquid-ordered phase formation in cholesterol/sphingomyelin bilayers: all-atom molecular dynamics simulations.

Jernej Zidar¹, Franci Merzel, Milan Hodoscek

¹National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia.

The Journal of Physical Chemistry. B

|November 26, 2009

Summary

High cholesterol levels in lipid bilayers promote a liquid-ordered phase, crucial for lipid raft formation. This packing is driven by cholesterol-sphingomyelin hydrogen bonds, aligning with ostreolysin

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Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

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Area of Science:

Biophysics
Computational Biology
Membrane Biophysics

Background:

Lipid bilayers are fundamental to cell membrane structure and function.
Cholesterol and sphingomyelin are key components influencing membrane properties.
Lipid rafts are specialized membrane domains implicated in various cellular processes.

Purpose of the Study:

To investigate the structural and dynamic effects of varying cholesterol/sphingomyelin molar ratios in lipid bilayers.
To explore the molecular mechanisms underlying lipid packing and phase transitions.
To correlate simulation findings with experimental observations of membrane protein activity.

Main Methods:

All-atom molecular dynamics simulations were employed.
Simulations focused on lipid bilayers with diverse cholesterol and sphingomyelin compositions.
Analysis included structural organization, molecular dynamics, and hydrogen bonding patterns.

Main Results:

Cholesterol concentrations above 30 mol % induce the formation of a liquid-ordered phase.
This phase transition is characterized by altered lipid distribution and enhanced molecular packing.
Hydrogen bonding between cholesterol and sphingomyelin molecules drives this molecular organization.

Conclusions:

The formation of a liquid-ordered phase is a precursor to lipid raft formation.
Specific hydrogen bonding interactions between cholesterol and sphingomyelin are critical for membrane packing.
The observed 30 mol % cholesterol threshold aligns with experimental data on ostreolysin membrane activity.