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Related Concept Videos

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.
Another mechanism for membrane domain formation involves membrane proteins interacting with...
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Ion Channels01:19

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
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Ligand-gated Ion Channels01:19

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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
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Non-gated Ion Channels01:24

Non-gated Ion Channels

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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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Membrane Fluidity01:26

Membrane Fluidity

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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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Updated: Feb 23, 2026

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

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Lipid nanodomains change ion channel function.

Michael Weinrich1, David L Worcester, Sergey M Bezrukov

  • 1Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, USA. michael.weinrich@verizon.net.

Nanoscale
|September 1, 2017
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Summary
This summary is machine-generated.

Lipid rafts, cholesterol-rich membrane domains, influence ion channel function. This study shows nanoscale lipid phase separation directly impacts gramicidin dimer dissociation kinetics in model membranes.

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Area of Science:

  • Biochemistry
  • Membrane Biophysics
  • Molecular Biology

Background:

  • Signaling proteins and receptors associate with lipid rafts, cholesterol-rich membrane domains.
  • Lipid rafts can modulate protein function, but their effect on ion channels is not well understood.
  • Gramicidin dimer serves as a model ion channel for studying membrane interactions.

Purpose of the Study:

  • To investigate the influence of lipid rafts on ion channel function.
  • To examine how cholesterol and lipid phase separation affect ion channel kinetics.
  • To provide evidence for modulation of ion channel function within lipid rafts.

Main Methods:

  • Utilized raft-forming model membrane systems incorporating cholesterol.
  • Investigated lipid lateral phase separation at the nanoscale.
  • Measured the dissociation kinetics of the gramicidin dimer.

Main Results:

  • Demonstrated direct impact of lipid lateral phase separation on gramicidin dimer dissociation.
  • Showcased nanoscale lipid organization influencing ion channel behavior.
  • Provided experimental evidence linking membrane domain structure to ion channel kinetics.

Conclusions:

  • Nanoscale lipid phase separation in cholesterol-rich domains directly modulates ion channel dissociation kinetics.
  • This finding highlights the functional relevance of lipid raft microdomains for ion channel activity.
  • Supports the hypothesis that the lipid environment within rafts affects protein function.