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Membrane Domains01:18

Membrane Domains

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.
Protein Domains
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 anterior...
Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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%...
Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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 cytoskeletal...
Fluid Mosaic Model01:19

Fluid Mosaic Model

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 with the analogy of...
Membrane Fluidity01:23

Membrane Fluidity

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.
What are Membranes?01:54

What are Membranes?

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 Golgi...

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Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions
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Published on: August 3, 2021

Duplas capas de lípidos continuos derivados de las membranas celulares para la manipulación molecular espacial.

Lisa Simonsson1, Anders Gunnarsson, Patric Wallin

  • 1Department of Applied Physics, Chalmers University of Technology, Gothenburg, Sweden.

Journal of the American Chemical Society
|July 27, 2011
PubMed
Resumen

Los investigadores desarrollaron un nuevo método para crear bicapas lipídicas apoyadas por fluidos (SLB) a partir de membranas celulares reales. Este avance permite el enriquecimiento eficiente y la separación de los componentes de la membrana nativa para estudios avanzados de membranas celulares.

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Área de la Ciencia:

  • La biofísica es la biofísica.
  • Biología celular Biología celular.
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • El enriquecimiento y la separación de los componentes de la membrana nativa en entornos complejos de lípidos siguen siendo un reto.
  • La falta de métodos eficientes para generar bicapas lipídicas (SLB) continuas, con apoyo lateral de fluido, a partir de membranas celulares reales obstaculiza el progreso.

Objetivo del estudio:

  • Desarrollar un método eficiente para generar bicapas lipídicas soportadas (SLB) a partir de composiciones lipídicas complejas, incluidas las membranas celulares nativas.
  • Demostrar la transferencia y la conservación de la movilidad lateral de los componentes nativos de la membrana dentro de estos SLB.

Principales métodos:

  • Utilizó el borde de un SLB impulsado hidrodinámicamente para inducir la ruptura de las vesículas lipídicas adsorbidas.
  • SLBs preformados fundidos con vesículas derivadas directamente de las membranas celulares de los fibroblastos 3T3.
  • Transferencia molecular verificada utilizando la subunidad B de la toxina del cólera (CTB) que se une a los receptores gangliosídicos (G(M1) y G(M3) y movilidad lateral evaluada a través del flujo hidrodinámico.

Principales resultados:

  • Ha transferido con éxito componentes de membrana de vesículas lipídicas complejas y membranas celulares nativas a SLBs.
  • Se ha demostrado la conservación de la movilidad lateral de los gangliosidos transferidos (G ((M1) / G ((M3)) dentro del SLB.
  • Se identificaron dos poblaciones distintas de unión de CTB, que se correlacionan con diferentes números de anclaje de gangliosidos.

Conclusiones:

  • El borde de un SLB impulsado hidrodinámicamente puede inducir eficientemente la ruptura de la vesícula y transferir componentes de la membrana nativa.
  • Este método facilita la creación de SLBs fluidos a partir de composiciones lipídicas difíciles, lo que permite estudios de la organización y dinámica de la membrana nativa.
  • La técnica ofrece un nuevo enfoque para el enriquecimiento y la separación de proteínas de membrana y lípidos específicos.