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Related Concept Videos

Membrane Domains01:18

Membrane Domains

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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
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The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
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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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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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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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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.
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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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Reconstitution of Membrane-Tethered Minimal Actin Cortices on Supported Lipid Bilayers
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Controlled Lipid Domain Positioning and Polarization in Confined Minimal Cell Models.

Koyomi Nakazawa1, Antoine Lévrier1, Sergii Rudiuk1

  • 1PASTEUR, Department of Chemistry, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005, Paris, France.

Angewandte Chemie (International Ed. in English)
|December 23, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to precisely position lipid domains within giant unilamellar vesicles (GUVs). This technique uses microfluidic channels to control domain localization, enabling the creation of polarized GUVs for cell model studies.

Keywords:
Giant Unilamellar VesicleLipid domainMicrofluidicsPolarizationSynthetic Cell

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Area of Science:

  • Biophysics
  • Materials Science
  • Cell Biology

Background:

  • Giant unilamellar vesicles (GUVs) serve as essential minimal cell models.
  • Controlling the spatial distribution of membrane domains in GUVs is critical but challenging.
  • Understanding lipid domain organization is key to deciphering cellular functions.

Purpose of the Study:

  • To develop a novel method for precise spatial control of lipid domains in GUVs.
  • To create anisotropic GUVs with user-defined domain positioning.
  • To enable the study of spatio-temporal membrane domain dynamics.

Main Methods:

  • Confining phase-separating giant unilamellar vesicles (GUVs) in microfluidic channels.
  • Utilizing line tension reduction via domain fusion to localize minority-phase domains.
  • Investigating the influence of lipid phase fraction on domain coalescence.

Main Results:

  • Demonstrated control over the spatial position and number of liquid-ordered (Lo)/liquid-disordered (Ld) phase domains.
  • Showed domain localization is governed by phase fraction, not lipid identity.
  • Achieved polarized GUVs with a controllable number of poles.

Conclusions:

  • A robust and versatile method for generating anisotropic GUVs with controlled domain positioning has been established.
  • This technique facilitates parallel single-vesicle experiments.
  • The findings advance the development of sophisticated minimal cell models.