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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.
Membrane Asymmetry Regulating Transporters01:19

Membrane Asymmetry Regulating Transporters

Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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...
The Fluid Mosaic Model01:34

The 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.

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Related Experiment Video

Updated: May 31, 2026

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
10:02

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions

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[Membrane fluidity--biophysical parameter in relation to membrane transport processes].

M Guţu1, V Rusu, Cipriana Ştefănescu

  • 1Facultatea de Medicină, Disciplina de Biofizică si Fizică medicală, Universitatea de Medicină si Farmacie Gr.T. Popa Iaşi.

Revista Medico-Chirurgicala a Societatii De Medici Si Naturalisti Din Iasi
|June 22, 2011
PubMed
Summary

Membrane fluidity, influenced by biophysical and biochemical factors, is crucial for cell membrane organization and function. It directly impacts both passive and active cellular transport mechanisms.

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Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
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Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer
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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Membrane fluidity is a critical determinant of cell membrane organization, existing in gel or liquid crystal states.
  • It is influenced by various biophysical factors (temperature, pH, charges) and biochemical factors (lipid ratios, fatty acid saturation).

Purpose of the Study:

  • To explore the relationship between membrane fluidity and cellular transport processes.
  • To elucidate how lipid composition and interactions affect membrane functions.

Main Methods:

  • Review of experimental data linking membrane fluidity to cellular processes.
  • Analysis of lipid-protein interactions and their impact on transport.

Main Results:

  • Membrane fluidity directly influences passive transport via lipid composition and channel interactions.
  • Lipid-protein interactions, including annular and non-annular lipids, modulate channel activity.
  • Cholesterol and membrane microdomains affect active transport pump conformation.

Conclusions:

  • Membrane fluidity is intrinsically linked to both passive and active transport mechanisms.
  • Modulation of membrane fluidity through lipid composition and interactions is key to regulating cellular transport.