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Related Concept Videos

Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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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...
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Mechanisms of Membrane-bending01:15

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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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
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Pinching-off of Coated Vesicles01:32

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Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
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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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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
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Updated: Jan 15, 2026

Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions
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Dynamic Shape Modulation of Deflated and Adhered Lipid Vesicles.

Gianna Wolfisberg1, Jaime Agudo-Canalejo2, Pablo C Bittmann1

  • 1Department of Materials, ETH Zürich, 8093 Zürich, Switzerland.

Journal of the American Chemical Society
|October 10, 2025
PubMed
Summary
This summary is machine-generated.

Giant unilamellar vesicles (GUVs) were osmotically deflated to mimic organelle shapes. This provides a new experimental method to study membrane shaping and protein sorting in vitro.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Membrane Biophysics

Background:

  • Organelles have complex shapes crucial for function.
  • Reproducing organelle morphology in vitro is challenging.
  • Small reduced volumes are characteristic of organelles like Golgi cisternae.

Purpose of the Study:

  • To develop an in vitro method to create organelle-like shapes.
  • To quantitatively study membrane mechanics and shape determination.
  • To investigate mechanisms of curvature-mediated protein sorting.

Main Methods:

  • Osmotic deflation of giant unilamellar vesicles (GUVs).
  • Application of the Canham-Helfrich model for shape analysis.
  • Determination of mechanical parameters: adhesion strength, membrane tension, and pressure.

Main Results:

  • Achieved reduced volumes as low as 0.1 in GUVs, mimicking organelle shapes.
  • Identified normalized adhesion strength as key to shape flattening rate.
  • Established a geometric relationship to estimate adhesion strength from vesicle geometry.

Conclusions:

  • Developed a quantitative experimental platform for studying membrane shaping.
  • Provides insights into organelle morphology and its functional implications.
  • Enables bottom-up investigation of shape-dependent phenomena like protein sorting.