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Related Concept Videos

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...
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 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...
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.Fatty acids tails of phospholipids can be either saturated or...
Lipids as Anchors01:32

Lipids as Anchors

In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains the...
Fluid Mosaic Model01:19

Fluid Mosaic Model

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 with the analogy of...

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Related Experiment Video

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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

Protein-promoted membrane domains.

J A Poveda1, A M Fernández, J A Encinar

  • 1Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, Elche, Spain. ja.poveda@umh.es

Biochimica Et Biophysica Acta
|February 26, 2008
PubMed
Summary

Integral membrane proteins dynamically shape biological membrane domains. This review explores how protein-lipid interactions drive domain formation, crucial for cellular functions like signal transduction and protein activation.

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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
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Area of Science:

  • Cell Biology
  • Biophysics
  • Membrane Biology

Background:

  • Biological membranes are complex, dynamic structures with specialized compartments called domains.
  • These domains are vital for cellular functions including sorting, signal transduction, fusion, and protein activation.
  • While lipid-lipid interactions forming raft domains are well-studied, this review focuses on protein-induced domains.

Purpose of the Study:

  • To review the mechanisms by which integral membrane proteins induce and segregate lipid domains.
  • To explore the nature of interactions governing protein-induced membrane domains.
  • To highlight the role of nicotinic acetylcholine receptors (nAChR) in domain formation.

Main Methods:

  • Literature review focusing on integral membrane protein-induced lipid domains.
  • Analysis of lipid-lipid and lipid-protein interaction mechanisms.
  • Case study on domains induced by the nicotinic acetylcholine receptor (nAChR).

Main Results:

  • Integral membrane proteins actively shape membrane lipid domains.
  • Both lipid-lipid and lipid-protein interactions are critical for domain segregation.
  • nAChR serves as a model for protein-induced domain formation.

Conclusions:

  • The formation of protein-segregated lipid domains requires a synergistic interplay of lipid-lipid and lipid-protein interactions.
  • Understanding these interactions is key to comprehending membrane organization and function.
  • Protein-induced membrane domains are a significant aspect of membrane complexity.