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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.

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...

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...

Membrane Domains

Membrane Domains

The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...

Enlargement of the Plasma Membrane

Enlargement of the Plasma Membrane

Cell division and enlargement are processes that require precise control. The control ensures that cell division cannot proceed unless the cell has grown to a specific size. A spherical, dividing cell requires an approximately 1.6X increase in its surface area to double its volume. The secretory pathway also has a significant role in cell membrane enlargement. Secretory vesicles that bud off from the Golgi apparatus and later fuse with the plasma membrane during exocytosis are a major source of...

Mechanisms of Membrane Domain Formation

Mechanisms of Membrane Domain Formation

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...

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Related Experiment Video

Updated: May 2, 2026

Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution

Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution

Published on: August 16, 2016

Pore formation in fluctuating membranes.

Oded Farago¹, Christian D Santangelo

¹Materials Research Laboratory, University of California, Santa Barbara, CA 93106, USA.

The Journal of Chemical Physics

|March 3, 2005

Summary

This summary is machine-generated.

This study reveals a new low-tension regime for pore nucleation in lipid membranes, driven by temperature and entropic forces. It highlights how membrane and pore fluctuations influence stability and formation.

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Last Updated: May 2, 2026

Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution

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Published on: August 16, 2016

Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film

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Spontaneous Formation and Rearrangement of Artificial Lipid Nanotube Networks as a Bottom-Up Model for Endoplasmic Reticulum

Spontaneous Formation and Rearrangement of Artificial Lipid Nanotube Networks as a Bottom-Up Model for Endoplasmic Reticulum

Published on: January 22, 2019

Area of Science:

Biophysics
Physical Chemistry
Materials Science

Background:

Lipid membranes exhibit inherent fluctuations affecting their properties.
Pore formation is crucial for membrane function but classically understood under high tension.

Purpose of the Study:

To investigate pore nucleation in fluctuating lipid membranes, considering both membrane and pore shape dynamics.
To establish stability criteria for different pore formation regimes.

Main Methods:

Theoretical framework incorporating membrane and pore fluctuations.
Analysis of nucleation free energy using effective surface and line tensions.

Main Results:

Identified a low-tension pore formation regime beyond classical nucleation theory.
Demonstrated that effective tensions can reverse sign from bare values at high temperatures.
Found that pore opening can be entropically favorable at elevated temperatures.

Conclusions:

Membrane and pore fluctuations significantly alter pore nucleation dynamics.
A novel low-tension regime exists where entropic effects dominate, enabling pore formation.
The findings provide new stability criteria for lipid membrane pores.