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Related Concept Videos

Introduction to Membrane Proteins01:16

Introduction to Membrane Proteins

The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell types have...
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...
Membrane Proteins01:30

Membrane Proteins

Plasma membranes have integral transmembrane proteins involved in facilitated transport. These proteins are collectively referred to as transport proteins, and they function as either channels for the material or as carriers themselves. Channel proteins have hydrophilic domains exposed to the intracellular and extracellular fluids and a hydrophilic channel through their core that provides a hydrated opening for solutes to pass through the membrane layers. Passage through the channel allows...
Multi-pass Transmembrane Proteins and β-barrels01:09

Multi-pass Transmembrane Proteins and β-barrels

In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as G-protein-linked receptors (GPCRs) and...
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...
Single-pass Transmembrane Proteins01:25

Single-pass Transmembrane Proteins

Integral membrane proteins are tightly associated with the cell membrane and play a crucial role in cell communication, signaling, adhesion, and transport of the molecules. Some integral membrane proteins are present only in the membrane monolayer. For example, the enzyme fatty acid amide hydrolase is present in the cytoplasmic side of the membrane monolayer. In contrast, another type of integral membrane protein, also known as a transmembrane protein, spans across the membrane. Transmembrane...

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A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics
10:31

A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics

Published on: September 2, 2020

Model membrane platforms to study protein-membrane interactions.

Erdinc Sezgin1, Petra Schwille

  • 1Biophysics/BIOTEC, TU Dresden, Tatzberg, Dresden, Germany.

Molecular Membrane Biology
|July 27, 2012
PubMed
Summary
This summary is machine-generated.

Simplified model membranes like Supported Lipid Bilayers (SLBs), Giant Unilamellar Vesicles (GUVs), and Giant Plasma Membrane Vesicles (GPMVs) are crucial for studying protein-membrane interactions. These systems help overcome the complexity of living cells for quantitative analysis.

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

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Last Updated: May 20, 2026

A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics
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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Protein-lipid interactions are fundamental to cellular membrane function.
  • Studying these interactions in living cells is challenging due to complex, uncontrollable components.
  • Simplified model systems are needed to investigate key biological processes.

Purpose of the Study:

  • To review minimal model membrane systems for studying protein-membrane interactions.
  • To highlight the utility of Supported Lipid Bilayers (SLBs), Giant Unilamellar Vesicles (GUVs), and Giant Plasma Membrane Vesicles (GPMVs).

Main Methods:

  • Review of established minimal model membrane systems.
  • Discussion of Supported Lipid Bilayers (SLBs).
  • Discussion of Giant Unilamellar Vesicles (GUVs).
  • Discussion of Giant Plasma Membrane Vesicles (GPMVs).

Main Results:

  • SLBs, GUVs, and GPMVs offer varying degrees of complexity to mimic biological membranes.
  • These model systems facilitate focused investigation of protein-lipid interactions.
  • Applications of these models in understanding protein-membrane dynamics are presented.

Conclusions:

  • Minimal model membrane systems are essential tools for quantitative study of protein-membrane interactions.
  • SLBs, GUVs, and GPMVs provide valuable platforms for dissecting fundamental cellular processes.
  • Further research utilizing these models will advance our understanding of membrane biology.