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Related Concept Videos

Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

3.2K
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 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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Structure of Porins01:21

Structure of Porins

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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
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Fluid Mosaic Model01:19

Fluid Mosaic Model

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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 Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

3.6K
The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Membrane Fluidity01:26

Membrane Fluidity

12.0K
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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Related Experiment Video

Updated: Sep 11, 2025

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
10:49

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy

Published on: March 5, 2017

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Structural basis for membrane microdomain formation by a human Stomatin complex.

Jack Stoner1,2, Shufang Li3, Ziao Fu4,5

  • 1Center for the Investigation of Membrane Excitability Diseases, Washington University School of Medicine, St. Louis, MO, USA.

Nature Communications
|August 12, 2025
PubMed
Summary
This summary is machine-generated.

Stomatin proteins form a ring-like structure in cell membranes, stiffening them and creating distinct microdomains. This discovery reveals how these proteins influence membrane mechanics and may impact diseases.

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Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies
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Related Experiment Videos

Last Updated: Sep 11, 2025

Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy

Published on: March 5, 2017

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Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies
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Area of Science:

  • Biochemistry
  • Structural Biology
  • Cell Biology

Background:

  • Biological membranes are dynamic structures that actively sense and respond to mechanical forces.
  • Stomatin-family proteins are known to modulate membrane stiffness and ion channel activity, but their molecular mechanisms are unclear.

Purpose of the Study:

  • To determine the molecular structure of the human Stomatin complex in a native membrane environment.
  • To elucidate the mechanism by which Stomatin proteins influence membrane mechanics.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) at 2.2 Å resolution.
  • Structural analysis of the human Stomatin complex in a native membrane.

Main Results:

  • The human Stomatin complex forms a 16-subunit ring-shaped homo-oligomer, creating a ~12 nm-wide, curvature-resistant membrane microdomain.
  • The complex induces localized membrane stiffening, maintaining a flat membrane surface.
  • A symmetry-broken hydrophobic β-barrel pore with C8 symmetry was observed, stabilized by inter-subunit salt bridges.

Conclusions:

  • The Stomatin oligomer provides a molecular framework for shaping membrane architecture and mechanics.
  • These findings offer insights into Stomatin's role in mechanotransduction and diseases like nephrotic syndrome.