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Related Concept Videos

Fluid Mosaic Model01:19

Fluid Mosaic Model

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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...
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The Fluid Mosaic Model01:34

The Fluid Mosaic Model

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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.
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Membrane Fluidity01:26

Membrane Fluidity

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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...
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Membrane Fluidity01:23

Membrane Fluidity

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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.
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Membrane Domains01:18

Membrane Domains

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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...
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Asymmetric Lipid Bilayer01:35

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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%...
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Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
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A FLUID LIPID-GLOBULAR PROTEIN MOSAIC MODEL OF MEMBRANE STRUCTURE.

S J Singer1

  • 1Department of Biology University of California at San Diego, La Jolla, California 92037.

Annals of the New York Academy of Sciences
|November 2, 2017
PubMed
Summary
This summary is machine-generated.

The lipid-globular protein mosaic model describes biological membranes as a dynamic, fluid mosaic. Integral proteins with amphipathic structures are embedded within a discontinuous lipid bilayer, allowing for component diffusion.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • The lipid-globular protein mosaic model was proposed to explain biological membrane organization.
  • Integral membrane proteins are thought to possess amphipathic structures within the membrane.
  • These proteins are intercalated into a discontinuous lipid bilayer.

Purpose of the Study:

  • To describe the thermodynamic and experimental foundations of the lipid-globular protein mosaic model.
  • To elaborate on the proposed structure and dynamics of biological membranes.
  • To discuss the functional and physiological implications of this membrane model.

Main Methods:

  • Review of thermodynamic principles underlying membrane structure.
  • Analysis of experimental evidence supporting the model.
  • Discussion of theoretical implications for membrane function.

Main Results:

  • Experimental results support the concept of lipids forming the membrane matrix.
  • Membrane lipids are generally fluid, not crystalline, under physiological conditions.
  • The mosaic structure allows for translational diffusion of membrane components.

Conclusions:

  • Biological membranes are dynamic, fluid mosaics, not static structures.
  • The model provides a framework for understanding membrane organization and function.
  • The amphipathic nature of proteins and fluid lipid matrix are key features.