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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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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 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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Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

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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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Assembly of the Lipid Bilayer in the ER01:28

Assembly of the Lipid Bilayer in the ER

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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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Related Experiment Video

Updated: May 21, 2025

Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
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Dynamic Duos: Coacervate-Lipid Membrane Interactions in Regulating Membrane Transformation and Condensate Size.

Karthika S Nair1,2, Sreelakshmi Radhakrishnan1,2, Harsha Bajaj1,2

  • 1Microbial Processes and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Trivandrum, Kerala, 695019, India.

Small (Weinheim an Der Bergstrasse, Germany)
|March 31, 2025
PubMed
Summary

Cellular condensates interact with lipid membranes, influencing cellular functions. This study reveals how coacervate size and electrostatic interactions with membranes control condensate size and localization within cells.

Keywords:
condensate size regulationcondensateselectrostatic interactiongiant unilamellar vesiclesliquid‐liquid phase separationmembrane transformation

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Area of Science:

  • Cellular Biology
  • Biophysics
  • Materials Science

Background:

  • Biomolecular condensates are essential for cellular functions.
  • The role of lipid membranes in regulating cellular condensates is not well understood.

Purpose of the Study:

  • To investigate the intricate interactions between biomolecular condensates and lipid membranes.
  • To elucidate how lipid membranes regulate condensate properties and cellular localization.

Main Methods:

  • Utilized cell-mimetic systems, specifically Giant Unilamellar Vesicles (GUVs).
  • Employed Fluorescence Recovery After Photobleaching (FRAP) to quantify lipid diffusion.
  • Applied Transmission Electron Microscopy (TEM) and high-resolution imaging for structural analysis.

Main Results:

  • Coacervate size and electrostatic interactions significantly impact membrane properties and deformation.
  • Budding transitions occur at the condensate-membrane interface with large coacervates and minimal electrostatic interaction.
  • High charge-charge interactions lead to membranes acting as nucleation sites, causing vesicle surface wrinkling.
  • Lipid diffusion is modulated at the interaction site, restricting condensate coarsening.
  • Condensates were observed within membrane folds and invaginations, controlling droplet size.

Conclusions:

  • Lipid bilayers play a critical role in controlling cellular condensate sizes.
  • Findings provide mechanistic insights into the nucleation and localization of cellular condensates.
  • Understanding these interactions is key to comprehending cellular organization and function.