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Related Concept Videos

Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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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

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.
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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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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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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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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Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions
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Bending membranes into different shapes.

Adrian Gross1

  • 1Department of Biochemistry and Molecular Biology, Rosalind Franklin University of Medicine and Science, 3333 Green Bay Road, North Chicago, IL 60064, USA.

Structure (London, England : 1993)
|May 9, 2015
PubMed
Summary
This summary is machine-generated.

BAR domain proteins like amphiphysin shape cell membranes. Their interaction depth determines if they form vesicles or tubes, crucial for membrane remodeling.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Structural Biology

Background:

  • BAR domain proteins are key regulators of membrane curvature.
  • Amphiphysin is a BAR domain protein involved in membrane dynamics.

Purpose of the Study:

  • To investigate the structural basis of amphiphysin's interaction with membranes.
  • To understand how amphiphysin binding leads to different membrane shapes (vesicles vs. tubes).

Main Methods:

  • Structural analysis of amphiphysin interacting with lipid vesicles and tubular membranes.
  • High-resolution imaging techniques.

Main Results:

  • Amphiphysin exhibits distinct binding modes depending on membrane geometry.
  • Superficial interactions promote vesicle formation.
  • Penetrating and crowded interactions favor tube formation.

Conclusions:

  • The mode of BAR domain interaction dictates the resulting membrane curvature.
  • Amphiphysin's adaptability allows it to remodel membranes into diverse structures.