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Related Concept Videos

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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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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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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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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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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Related Experiment Video

Updated: Oct 5, 2025

Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions
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Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions

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Lipid Droplets Embedded in a Model Cell Membrane Create a Phospholipid Diffusion Barrier.

Sevde Puza1, Stefanie Caesar2, Chetan Poojari3

  • 1Saarland University, Experimental Physics and Center for Biophysics (ZBP), Saarland University, 66123, Saarbrücken, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|January 24, 2022
PubMed
Summary
This summary is machine-generated.

Lipid droplets (LDs) form a lens shape when embedded in bilayers, with a diffusion barrier at the interface influencing protein partitioning in cells.

Keywords:
lipid bilayerslipid diffusionlipid dropletsmonotopic membrane proteinsphospholipid monolayerswetting

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Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes
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Single-Molecule Diffusion and Assembly on Polymer-Crowded Lipid Membranes

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Area of Science:

  • Cell Biology
  • Biophysics
  • Membrane Biology

Background:

  • Lipid droplets (LDs) are cytoplasmic fat storage organelles originating from the endoplasmic reticulum (ER) membrane.
  • LDs consist of neutral lipids surrounded by a phospholipid monolayer containing monotopic proteins crucial for lipid metabolism.

Purpose of the Study:

  • To investigate the factors determining protein partitioning between phospholipid bilayers and LD monolayer membranes.
  • To understand the physical properties of reconstituted lipid droplet-bilayer systems.

Main Methods:

  • Utilized microfluidics to create freestanding phospholipid bilayers with physiological lipid composition.
  • Dispersed micrometer-sized lipid droplets (LDs) around bilayers for spontaneous insertion.
  • Employed confocal microscopy for 3D geometry determination and Fluorescence Recovery After Photobleaching (FRAP) for diffusion barrier analysis.
  • Conducted coarse-grained molecular dynamics simulations to analyze lipid distributions.

Main Results:

  • Reconstituted LDs exhibited a lens shape at the bilayer interface, consistent with wetting theory.
  • A phospholipid diffusion barrier was identified at the monolayer-bilayer interface.
  • Molecular dynamics simulations revealed lipid-specific density distributions at the pore rim, explaining the diffusion barrier.

Conclusions:

  • The lens shape of reconstituted LDs is governed by equilibrium wetting principles.
  • A phospholipid diffusion barrier at the LD-bilayer interface may regulate protein partitioning between the ER membrane and LDs in vivo.
  • Understanding this barrier is key to elucidating lipid droplet-protein interactions in cellular lipid metabolism.