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Related Concept Videos

Membrane Fluidity01:26

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...
Membrane Fluidity01:23

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 Domains01:18

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 anterior...
Fluid Mosaic Model01:19

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 Model01:34

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...
Mechanisms of Membrane Domain Formation00:59

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 cytoskeletal...

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Related Experiment Video

Updated: Jun 24, 2026

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
10:49

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy

Published on: March 5, 2017

Cytoskeleton-membrane interactions in membrane raft structure.

Gurunadh R Chichili1, William Rodgers

  • 1Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, 825 NE 13th Street, Oklahoma City, OK 73104, USA.

Cellular and Molecular Life Sciences : CMLS
|April 17, 2009
PubMed
Summary
This summary is machine-generated.

Cell membrane rafts, crucial for cell function, are organized by the actin cytoskeleton. This interaction is vital for raft structure, signaling, and T cell activation in the immune response.

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Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions
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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
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Published on: July 28, 2022

Area of Science:

  • Cell Biology
  • Biophysics
  • Immunology

Background:

  • Cell membranes exhibit structural heterogeneity with distinct domains.
  • Membrane domains, including cholesterol-dependent membrane rafts, form via lipid-lipid and protein-lipid interactions.
  • The precise mechanisms of membrane raft formation are an active area of research.

Purpose of the Study:

  • To review evidence for the structuring of membrane rafts by the cortical actin cytoskeleton.
  • To discuss the mechanisms underlying actin-dependent raft organization.
  • To explore the role of the actin cytoskeleton in regulating raft-associated signaling and T cell activation.

Main Methods:

  • Review of existing scientific literature on membrane rafts and actin cytoskeleton.
  • Analysis of experimental evidence demonstrating raft-cytoskeleton association.
  • Examination of studies on the functional requirements of rafts.

Main Results:

  • The actin cytoskeleton associates with membrane rafts.
  • Many raft structural and functional properties depend on an intact actin cytoskeleton.
  • The actin cytoskeleton regulates raft-associated signaling events.

Conclusions:

  • The cortical actin cytoskeleton plays a significant role in organizing membrane rafts.
  • Actin-raft interactions are essential for raft-associated signaling.
  • Synergistic function of membrane rafts and the actin cytoskeleton is critical for T cell activation and adaptive immunity.