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Related Concept Videos

What are Membranes?01:54

What are Membranes?

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A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved semi-permeable membranes that regulate the passage of biological molecules. Additionally, the cell membrane defines a cell’s shape and interactions with the external environment. Eukaryotic cell membranes also serve to compartmentalize the internal space into organelles, including the endomembrane structures of the nucleus, endoplasmic reticulum and...
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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 Fluidity01:26

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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.
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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Lipids as Anchors01:32

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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.
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Membrane Domains01:18

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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.
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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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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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Membrane proteins bind lipids selectively to modulate their structure and function.

Arthur Laganowsky1, Eamonn Reading1, Timothy M Allison1

  • 1Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 5QY, UK.

Nature
|June 6, 2014
PubMed
Summary
This summary is machine-generated.

This study uses mass spectrometry to reveal how lipids interact with membrane proteins. It shows that some lipids stabilize protein structures, influencing their function and providing insights into protein-lipid selectivity.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Mass Spectrometry

Background:

  • Membrane protein structure and function are influenced by lipid environments.
  • Understanding membrane protein selectivity towards lipids is crucial but remains incompletely understood.

Purpose of the Study:

  • To develop and apply a mass spectrometry approach to determine lipid-binding selectivity in membrane protein complexes.
  • To investigate the role of specific lipids in stabilizing membrane protein structure and modulating function.

Main Methods:

  • Utilized ion mobility mass spectrometry (IM-MS) to analyze gas-phase conformations of membrane protein-lipid complexes.
  • Employed functional assays and X-ray crystallography to validate findings and elucidate structural changes.

Main Results:

  • Demonstrated that folded membrane protein complexes exist in the gas phase, allowing for lipid-binding analysis.
  • Identified specific lipids that stabilize MscL, AqpZ, and AmtB, with cardiolipin modulating AqpZ function and phosphatidylglycerol being highly selective for AmtB.
  • Revealed distinct conformational changes in AmtB upon binding to phosphatidylglycerol.

Conclusions:

  • Resistance to gas-phase unfolding correlates with specific lipid-binding events, distinguishing stabilizing lipids from non-specific binders.
  • The study provides a method to assess lipid selectivity and its impact on membrane protein structure and function.
  • Findings offer insights into lipid modulation of protein function and potential drug binding interactions.