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Related Concept Videos

Fluid Mosaic Model01:19

Fluid Mosaic Model

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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...
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Enlargement of the Plasma Membrane01:22

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Cell division and enlargement are processes that require precise control. The control ensures that cell division cannot proceed unless the cell has grown to a specific size. A spherical, dividing cell requires an approximately 1.6X increase in its surface area to double its volume. The secretory pathway also has a significant role in cell membrane enlargement. Secretory vesicles that bud off from the Golgi apparatus and later fuse with the plasma membrane during exocytosis are a major source of...
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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
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The Fluid Mosaic Model01:34

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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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What are Membranes?01:24

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A cell's plasma membrane demarcates the cell's borders and determines the nature of its interaction with the environment. Cells exclude certain substances, take in others, and excrete some others in controlled quantities. The plasma membrane must be flexible to allow certain cells, such as red and white blood cells, to change their shape while passing through narrow capillaries. These are the more obvious plasma membrane functions. In addition, the plasma membrane's surface carries...
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What are Membranes?01:54

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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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Synthesis of Compound Giant Unilamellar Vesicles: A Biomimetic Model of Nucleate Cells
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Giant plasma membrane vesicles: models for understanding membrane organization.

Kandice R Levental1, Ilya Levental1

  • 1Department of Integrative Biology and Pharmacology, University of Texas Health Science Center at Houston - Medical School, Houston, TX, USA.

Current Topics in Membranes
|May 28, 2015
PubMed
Summary

The lipid raft hypothesis, suggesting membrane domains, is supported by liquid-liquid phase separation. Giant plasma membrane vesicles (GPMVs) are key experimental models for studying these biological membranes.

Keywords:
GPMVMicrodomainModel membranePartitioningPhase separationPlasma membranePlasma membrane vesicleRaft

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Area of Science:

  • Cell Biology
  • Biophysics
  • Membrane Physiology

Background:

  • Eukaryotic membrane organization into functional domains remains a complex area of study.
  • The lipid raft hypothesis proposes membrane compartmentalization into liquid domains via lipid interactions.
  • Direct visualization of these domains in live cells using light microscopy has been a significant challenge.

Purpose of the Study:

  • To review the role of giant plasma membrane vesicles (GPMVs) in validating and refining the lipid raft hypothesis.
  • To highlight the utility of GPMVs as an experimental model for investigating biological membranes.
  • To address outstanding questions in membrane biology using GPMVs.

Main Methods:

  • Utilizing giant plasma membrane vesicles (GPMVs) as an experimental model.
  • Applying the experimental toolbox of membrane physics.
  • Observing liquid-liquid phase separation in biological membranes.

Main Results:

  • Recent observations of liquid-liquid phase separation in biological membranes provide crucial validation for the raft hypothesis.
  • GPMVs enable the application of advanced biophysical techniques to study complex, phase-separated membrane systems.
  • This model facilitates a deeper understanding of membrane domain organization and function.

Conclusions:

  • Liquid-liquid phase separation in biological membranes supports the lipid raft hypothesis.
  • Giant plasma membrane vesicles (GPMVs) are instrumental in advancing our understanding of membrane organization and dynamics.
  • GPMVs offer a powerful platform for addressing fundamental questions in membrane biology.