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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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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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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
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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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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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Mechanism of Lamellipodia Formation01:31

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Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
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Related Experiment Video

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Pulling Membrane Nanotubes from Giant Unilamellar Vesicles
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Raft formation in lipid bilayers coupled to curvature.

Sina Sadeghi1, Marcus Müller1, Richard L C Vink1

  • 1Institute of Theoretical Physics, Georg-August-Universität Göttingen, Göttingen, Germany.

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Computer simulations reveal transient lipid raft-like domains in membranes, driven by curvature. Membrane elastic properties dictate domain size, supporting the microemulsion model. Phase separation occurs at lower temperatures.

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Area of Science:

  • Biophysics
  • Materials Science
  • Computational Chemistry

Background:

  • Cell membranes exhibit complex phase behaviors and domain formation.
  • Lipid rafts are dynamic, nanoscale membrane domains with specialized functions.
  • Membrane curvature is increasingly recognized as a factor influencing lipid organization.

Purpose of the Study:

  • To investigate the relationship between local membrane composition and local curvature.
  • To model the formation and characteristics of transient membrane domains.
  • To explore the influence of curvature-composition coupling on membrane phase behavior.

Main Methods:

  • Performing computer simulations of lipid membrane models.
  • Coupling local membrane composition to local membrane curvature.
  • Analyzing domain size, formation, and phase transition behavior.

Main Results:

  • Observed finite-sized transient domains (hundreds of nanometers) at high temperatures, resembling lipid rafts.
  • Demonstrated that membrane elastic properties determine the size of these transient domains.
  • Found that membrane phase separation at low temperatures is continuous (2D Ising universality class) for weak curvature coupling, but first-order for strong coupling.

Conclusions:

  • Membranes can act as curvature-induced microemulsions, forming transient domains.
  • The interplay between composition and curvature significantly impacts membrane phase behavior.
  • Simulation results provide insights into the physical mechanisms governing membrane domain formation and stability.