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Related Concept Videos

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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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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Assembly of the Lipid Bilayer in the ER01:28

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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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Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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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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Biosynthesis of Lipids01:29

Biosynthesis of Lipids

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Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis...
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Updated: Mar 22, 2026

Brain Membrane Fractionation: An Ex Vivo Approach to Assess Subsynaptic Protein Localization
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Brain Membrane Fractionation: An Ex Vivo Approach to Assess Subsynaptic Protein Localization

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Lipid Microdomains in Synapse Formation.

C Madwar1, G Gopalakrishnan1, R Bruce Lennox1

  • 1Department of Chemistry, McGill University , 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada.

ACS Chemical Neuroscience
|April 13, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a novel model membrane system to investigate how membrane lipid rafts influence neuronal processes. The findings reveal that lipid microdomains can guide axon growth and synapse formation in vitro.

Keywords:
Lipid membranesartificial synapseshippocampal neuronslipid raftsmembrane microdomainssupported bilayerssynaptic vesicles

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Area of Science:

  • Neuroscience
  • Biophysics
  • Cell Biology

Background:

  • Membrane lipid rafts, dynamic cholesterol/sphingolipid-rich domains, play critical roles in nervous system function and disease.
  • Characterizing lipid rafts' fundamental roles in neuronal processes is challenging due to their transient nature.

Purpose of the Study:

  • To develop and utilize an experimental platform for mimicking cellular lipid raft order.
  • To investigate how lipid raft organization influences neuronal development, specifically axonal guidance and synapse formation.

Main Methods:

  • Interfacing living neurons with a biomimetic model membrane system.
  • Reproducibly mimicking the lipid order of cellular lipid rafts in the model membrane.
  • Analyzing neuronal interactions with defined lipid microdomains in vitro.

Main Results:

  • Coexisting lipid microdomains in model membranes were shown to regulate axonal guidance.
  • Neurons were observed to favor specific lipid organizations and functional groups for establishing stable presynaptic contacts.
  • The model membrane platform facilitated the investigation of lipid raft influence on synapse formation.

Conclusions:

  • The presented model membrane platform offers an accessible method to study lipid raft functions in neuronal processes.
  • Specific lipid lateral organizations within rafts are crucial for synapse formation.
  • This platform can be extended to explore other cellular events influenced by lipid organization.