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Related Concept Videos

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.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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Membrane Fluidity01:23

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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 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.
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Fluid Mosaic Model01:19

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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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The Fluid Mosaic Model01:34

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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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Updated: Jun 8, 2025

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
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Mapping membrane biophysical nano-environments.

Luca Panconi1,2,3, Jonas Euchner3,4,5, Stanimir A Tashev3,4,5

  • 1Department of Immunology and Immunotherapy, School of Infection, Inflammation and Immunology, College of Medicine and Health, University of Birmingham, Birmingham, UK.

Nature Communications
|November 7, 2024
PubMed
Summary
This summary is machine-generated.

We developed a new method using advanced microscopy and topological data analysis to map nanoscale membrane domains in cells. This technique visualizes lipid environments at the nanometer scale, overcoming previous resolution limits.

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Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
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Area of Science:

  • Cell Biology
  • Biophysics
  • Microscopy

Background:

  • Mammalian plasma membranes possess lipid domains with distinct properties.
  • Studying these domains is challenging due to their small scale and similarity to the bulk membrane, often below optical microscopy resolution.

Purpose of the Study:

  • To develop and validate a method for mapping nanoscale membrane domains.
  • To visualize and quantify lipid environments within the plasma membrane at nanometer resolution.

Main Methods:

  • Utilized the solvatochromic probe di-4-ANEPPDHQ, which changes fluorescence emission based on its environment.
  • Employed spectrally resolved single-molecule localization microscopy (SR-SMLM).
  • Developed quantification algorithms based on topological data analysis (PLASMA) for marked point pattern data.

Main Results:

  • Successfully mapped nano-domains in artificial membranes and live cells with nanometer precision.
  • Demonstrated the ability to assess changes in membrane properties in response to external perturbations (e.g., methyl-β-cyclodextrin).
  • Generated marked point patterns combining localization coordinates and generalized polarization values.

Conclusions:

  • The integrated methodology provides a novel toolset for nanometer-scale mapping of membrane properties.
  • This approach overcomes resolution limitations of traditional optical microscopy for studying membrane domains.
  • Enables detailed investigation of membrane heterogeneity and dynamics.