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Related Concept Videos

Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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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.
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.
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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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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 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.
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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers

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Lipid bilayers: clusters, domains and phases.

David G Ackerman1, Gerald W Feigenson1

  • 1Department of Molecular Biology and Genetics, Field of Biophysics, Cornell University, Ithaca, NY 14853, U.S.A.

Essays in Biochemistry
|February 7, 2015
PubMed
Summary
This summary is machine-generated.

This chapter explores plasma membrane lipid mixing behaviors using model membranes. We examine lipid phase behavior and non-random mixing, applying Gibbs phase diagrams to understand cell membrane complexity.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Materials Science

Background:

  • The plasma membrane's complex lipid composition influences its function.
  • Understanding lipid mixing is crucial for modeling membrane behavior.
  • Model membrane systems simplify studying complex biological structures.

Purpose of the Study:

  • To discuss the complex mixing behavior of plasma membrane lipids.
  • To introduce plasma membrane models and lipid phase behavior.
  • To demonstrate the application of Gibbs phase diagrams in membrane studies.

Main Methods:

  • Introduction to plasma membrane structure and model mixtures.
  • Discussion of lipid phase behavior in bilayers.
  • Application of Gibbs phase diagrams to model membrane systems.

Main Results:

  • Distinction between lipid phases and non-random mixing phenomena (clusters, micelles, microemulsions).
  • Demonstration of Gibbs phase diagrams for complex model membranes.
  • Analysis of phase coexistence and morphology in lipid bilayers.

Conclusions:

  • Gibbs phase diagrams are applicable to complex model membrane systems.
  • Understanding lipid phase behavior and coexistence is key to plasma membrane function.
  • Model membranes provide insights into the cell plasma membrane's intricate properties.