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Related Concept Videos

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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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
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Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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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.
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Membrane Fluidity01:26

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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.
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The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
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Related Experiment Video

Updated: Feb 17, 2026

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
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DepHining membrane identity.

Gerald R V Hammond1

  • 1Department of Cell Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA ghammond@pitt.edu.

The Journal of Cell Biology
|December 14, 2017
PubMed
Summary
This summary is machine-generated.

Organelles maintain distinct molecular identities by linking phagosome acidification to specific lipid markers on their outer membranes. This research reveals a novel coordination mechanism for cellular compartments.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Organelle Biology

Background:

  • Organelles possess unique molecular compositions on their cytosolic-facing membranes and interiors.
  • Understanding how these distinct identities are maintained is crucial for cellular function.

Purpose of the Study:

  • To investigate the coordination of molecular identities in organelles.
  • To explore the relationship between phagosome acidification and membrane composition.

Main Methods:

  • The study by Naufer et al. (2017) likely involved biochemical and imaging techniques to analyze phagosome properties.
  • Investigated the role of lipid composition in organelle identity maintenance.

Main Results:

  • A significant link was discovered between the acidification process within phagosomes and specific lipid "signposts" present on the organelle's outer membrane.
  • This suggests a mechanism for regulating organelle identity based on internal environment and membrane lipids.

Conclusions:

  • Phagosome acidification is intricately connected to the lipid composition of its outer membrane.
  • This connection serves as a key mechanism for coordinating organelle molecular identity.