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Related Concept Videos

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...
What are Membranes?01:54

What are Membranes?

A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved semi-permeable membranes that regulate the passage of biological molecules. Additionally, the cell membrane defines a cell’s shape and interactions with the external environment. Eukaryotic cell membranes also serve to compartmentalize the internal space into organelles, including the endomembrane structures of the nucleus, endoplasmic reticulum and Golgi...
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...
What are Membranes?01:24

What are Membranes?

A cell's plasma membrane demarcates the cell's borders and determines the nature of its interaction with the environment. Cells exclude certain substances, take in others, and excrete some others in controlled quantities. The plasma membrane must be flexible to allow certain cells, such as red and white blood cells, to change their shape while passing through narrow capillaries. These are the more obvious plasma membrane functions. In addition, the plasma membrane's surface carries markers that...
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...
Fluid Mosaic Model01:19

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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...

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A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics
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Dynamic, yet structured: The cell membrane three decades after the Singer-Nicolson model.

G Vereb1, J Szöllosi, J Matkó

  • 1Department of Biophysics and Cell Biology, Research Center for Molecular Medicine, Medical and Health Science Center, University of Debrecen, H-4012, Debrecen, Hungary.

Proceedings of the National Academy of Sciences of the United States of America
|July 2, 2003
PubMed
Summary
This summary is machine-generated.

The fluid mosaic model is updated to a dynamically structured mosaic model, emphasizing membrane compartmentalization and nonrandom protein-lipid clustering for cellular functions. This revised model highlights cohesive forces and dynamic restructuring over simple fluidity.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Membrane Biology

Background:

  • The fluid mosaic model has been foundational for understanding biological membranes.
  • However, new data indicate compartmentalization is crucial for signal transduction, suggesting limitations of the original model.

Purpose of the Study:

  • To propose a modified membrane model, the "dynamically structured mosaic model," that incorporates recent experimental findings.
  • To re-evaluate the roles of mosaicism and fluidity in membrane organization and function.

Main Methods:

  • Review and synthesis of existing experimental data on membrane structure and dynamics.
  • Theoretical modification of the fluid mosaic model based on quantitative data.

Main Results:

  • Proposed "dynamically structured mosaic model" emphasizes nonrandom codistribution and clustering of membrane components (proteins and lipids).
  • Identified cohesive forces within microdomains, involving lipid-lipid, protein-protein, and protein-lipid interactions, as key to membrane assembly.
  • Highlighted the role of sub- and supramembrane effectors in maintaining membrane structure.

Conclusions:

  • Membrane structure is a multilevel, dynamically restructured mosaic, not solely defined by fluidity.
  • Compartmentalization and organized clustering are critical for complex cellular functions and signal transduction.