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Related Concept Videos

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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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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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

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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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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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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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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...
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Updated: May 23, 2025

Three-dimensional Characterization of Interorganelle Contact Sites in Hepatocytes using Serial Section Electron Microscopy
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Lipid Dynamics at Membrane Contact Sites.

Karin M Reinisch1,2, Pietro De Camilli1,2,3, Thomas J Melia1

  • 1Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut, USA; email: karin.reinisch@yale.edu, pietro.decamilli@yale.edu, thomas.melia@yale.edu.

Annual Review of Biochemistry
|March 11, 2025
PubMed
Summary

Cellular lipids are transported between organelles via proteins at contact sites, enabling precise membrane composition. This protein-mediated lipid transport is crucial for various physiological functions.

Keywords:
ATG2BLTPVPS13autophagosomemembrane expansionscramblase

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Lipids are synthesized in the endoplasmic reticulum and distributed to other organelles in eukaryotes.
  • Organelle communication and lipid distribution rely on vesicular transport and organelle contact sites.

Purpose of the Study:

  • To discuss protein-mediated lipid transport at organelle contact sites.
  • To highlight the roles of shuttle-like and bridge-like proteins in lipid transfer.
  • To explain the contribution of integral membrane proteins in facilitating lipid transport.

Main Methods:

  • Review of current literature on organelle contact sites and lipid transport.
  • Discussion of protein mechanisms involved in lipid transfer and membrane composition.
  • Analysis of integral membrane proteins assisting lipid transfer proteins.

Main Results:

  • Organelle contact sites facilitate lipid transport via shuttle-like and bridge-like proteins.
  • Shuttle proteins transfer single lipids, while bridge proteins enable bulk lipid movement.
  • Integral membrane proteins lower energy barriers and scramble lipids to optimize transfer.

Conclusions:

  • Protein-mediated lipid transport at organelle contact sites is essential for cellular lipid homeostasis.
  • These mechanisms fine-tune organelle membrane composition and support physiological processes.
  • Advances in understanding protein-lipid interactions are revealing new insights into cell function.