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Related Concept Videos

Membrane Fluidity01:23

Membrane Fluidity

163.6K
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.
163.6K
Membrane Fluidity01:26

Membrane Fluidity

13.3K
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...
13.3K
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...
14.3K
Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

8.7K
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%...
8.7K
Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

3.4K
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...
3.4K
The Fluid Mosaic Model01:34

The Fluid Mosaic Model

167.2K
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: Oct 26, 2025

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

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Interactions between Phase-Separated Liquids and Membrane Surfaces.

Samuel Botterbusch1, Tobias Baumgart1

  • 1Department of Chemistry, University of Pennsylvania.

Applied Sciences (Basel, Switzerland)
|July 30, 2021
PubMed
Summary
This summary is machine-generated.

Biological liquid-liquid phase separation can organize cellular components at membrane surfaces. This review explores how these membrane-associated condensates reshape membranes, modulate protein function, and dynamically organize vesicles.

Keywords:
aqueous two-phase systemsbiomimetic membranesbiomolecular condensatescomplex coacervationliquid-liquid phase separation

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Area of Science:

  • Biophysics
  • Cell Biology
  • Biochemistry

Background:

  • Liquid-liquid phase separation (LLPS) is a key cellular organization mechanism, forming membraneless organelles.
  • Many biological condensates interact with cellular membranes, a less-explored area.
  • Membrane-associated phase separation involves protein clusters, wetting droplets, and vesicle-containing droplets.

Purpose of the Study:

  • To review the phenomena of liquid-liquid phase separation at membrane surfaces.
  • To discuss the consequences of these membrane-associated phase-separated systems.
  • To highlight the dynamic interactions between liquid phases and lipid bilayers.

Main Methods:

  • Literature review of studies on membrane-associated biomolecular condensates.
  • Analysis of physical properties and consequences of LLPS at membrane interfaces.
  • Synthesis of common principles governing liquid phases and membrane interactions.

Main Results:

  • Membrane-associated LLPS can significantly alter membrane physical properties.
  • Phase separation can induce the formation of membrane-associated protein structures.
  • LLPS dynamically organizes lipid vesicles and modulates protein function at membranes.

Conclusions:

  • Membrane-associated liquid-liquid phase separation is a crucial organizational principle in cells.
  • Understanding these interactions is vital for comprehending cellular compartmentalization and function.
  • LLPS at membranes offers new perspectives on cellular organization beyond traditional membraneless organelles.