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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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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 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
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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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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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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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Mechanisms shaping cell membranes.

Michael M Kozlov1, Felix Campelo2, Nicole Liska3

  • 1Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, 69978 Tel Aviv, Israel.

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Summary
This summary is machine-generated.

Specialized proteins generate large membrane curvatures in intracellular organelles. This study quantifies membrane bending by hydrophobic insertions, comparing it to protein scaffolding and crowding mechanisms.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Intracellular organelle membranes exhibit significant curvature (10-30nm radii).
  • Membrane curvature arises from monolayer asymmetry, but large curvatures require specialized protein mechanisms.

Purpose of the Study:

  • To discuss protein-based mechanisms for generating large membrane curvatures.
  • To emphasize the physical requirements for effective protein-mediated curvature generation.
  • To quantitatively estimate membrane bending by hydrophobic insertions and compare mechanisms.

Main Methods:

  • Quantitative estimation of membrane bending energy.
  • Comparison of hydrophobic insertion, protein scaffolding, and protein crowding mechanisms.

Main Results:

  • Hydrophobic insertion provides a quantitative estimate for membrane bending.
  • Comparison of the efficiencies of different protein-mediated curvature generation mechanisms.

Conclusions:

  • Specialized proteins are essential for generating large membrane curvatures in organelles.
  • Hydrophobic insertion is a key mechanism, with its efficiency comparable to scaffolding and crowding.