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Related Concept Videos

Membrane Fluidity01:23

Membrane Fluidity

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.
Membrane Fluidity01:26

Membrane Fluidity

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 a relatively...
Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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%...
Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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 cytoskeletal...
Assembly of the Lipid Bilayer in the ER01:28

Assembly of the Lipid Bilayer in the ER

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.
A large chunk of any biological membrane is composed of phospholipids. These lipids have a heterogeneous distribution across different subcellular organelles and even between...
Membrane Domains01:18

Membrane Domains

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 anterior...

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Related Experiment Video

Updated: May 8, 2026

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

Published on: September 1, 2023

How membranes shape up for lipid transfer.

Takashi Hirashima1, Toshiya Endo1

  • 1Faculty of Life Sciences and the Protein Dynamics Institute, Kyoto Sangyo University, Kyoto, Japan.

Elife
|May 7, 2026
PubMed
Summary
This summary is machine-generated.

Mitochondrial outer membrane curvature regulates the extraction of phosphatidic acid, a key phospholipid. This finding reveals a novel mechanism controlling lipid dynamics within cellular membranes.

Keywords:
biochemistrycardiolipinchemical biologylipid transportmitochondrianonephosphatidic acid

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Last Updated: May 8, 2026

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
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Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions

Published on: August 3, 2021

Area of Science:

  • Cell Biology
  • Biochemistry
  • Membrane Biophysics

Background:

  • Mitochondria are vital organelles with a double membrane.
  • The mitochondrial outer membrane (MOM) plays roles in apoptosis and lipid metabolism.
  • Phosphatidic acid is a crucial phospholipid involved in membrane biogenesis and signaling.

Purpose of the Study:

  • To investigate the relationship between mitochondrial outer membrane curvature and phosphatidic acid extraction.
  • To elucidate the regulatory mechanisms governing lipid dynamics at the MOM.

Main Methods:

  • Utilized advanced microscopy techniques to visualize MOM curvature.
  • Employed biochemical assays to quantify phosphatidic acid levels.
  • Investigated the role of specific proteins in the extraction process.

Main Results:

  • Demonstrated a direct correlation between increased MOM curvature and enhanced phosphatidic acid extraction.
  • Identified specific lipid-binding proteins that are sensitive to membrane curvature.
  • Showcased that membrane curvature acts as a key regulator of phosphatidic acid homeostasis.

Conclusions:

  • Mitochondrial outer membrane curvature is a critical determinant for the controlled extraction of phosphatidic acid.
  • This curvature-dependent mechanism offers new insights into lipid regulation within mitochondria.
  • Understanding this process could have implications for mitochondrial function and disease.