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Related Concept Videos

Membrane Fluidity01:23

Membrane Fluidity

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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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Mechanisms of Membrane-bending01:15

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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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Protein Diffusion in the Membrane01:24

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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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.
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

Mechanisms of Membrane Domain Formation

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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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Surface Tension of Fluid

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
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Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions
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CURVATURE-DRIVEN MOLECULAR FLOW ON MEMBRANE SURFACE.

Michael Mikucki1, Y C Zhou2

  • 1Department of Applied Mathematics & Statistics, Colorado School of Mines, Golden, Colorado, 80401-1887.

SIAM Journal on Applied Mathematics
|October 24, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a mathematical model for molecular localization on cell membranes. The model predicts how molecules gather at specific membrane curvatures, influencing membrane shape and vice versa.

Keywords:
35Q9265M7092C40energy potentiallipid bilayer membranemean curvatureprotein localization

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Area of Science:

  • Biophysics
  • Mathematical Biology
  • Computational Biology

Background:

  • Cell membrane morphology is influenced by protein interactions within crowded lipid environments.
  • Understanding molecular distribution on membranes is crucial for biological processes.

Purpose of the Study:

  • To develop a mathematical model for predicting molecular localization on curved membrane surfaces.
  • To investigate the interplay between molecular concentration, membrane curvature, and morphological changes.

Main Methods:

  • An energetic description of molecule distribution on curved surfaces.
  • A drift-diffusion equation to model molecule concentration gradients.
  • An Eulerian phase field approach to define membrane morphology.

Main Results:

  • Predicted molecular localization on static membranes at regions with specific mean curvatures.
  • Demonstrated the generation of preferred mean curvature driven by molecular localization.

Conclusions:

  • The mathematical model successfully predicts molecular localization based on membrane curvature.
  • A feedback loop exists where molecular localization influences membrane shape, and vice versa.