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Related Concept Videos

Fluid Mosaic Model01:19

Fluid Mosaic Model

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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 Domains01:18

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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.
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...
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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.
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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.
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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.
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Fluorescent Leakage Assay to Investigate Membrane Destabilization by Cell-Penetrating Peptide
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Fluorescent Leakage Assay to Investigate Membrane Destabilization by Cell-Penetrating Peptide

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A dive into membrane dynamics with sponge peptides.

Danmeng Luo1, Hendrik Luesch1

  • 1Department of Medicinal Chemistry, University of Florida, Gainesville, FL 32610, USA; Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL 32610, USA.

Chemistry & Biology
|May 23, 2015
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Summary
This summary is machine-generated.

Theonellamides specifically recognize cholesterol in cell membranes, altering membrane structure and cell shape. These compounds may help researchers study cell membrane properties.

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Area of Science:

  • Membrane Biophysics
  • Cell Biology
  • Natural Product Chemistry

Background:

  • Cell membranes are complex structures crucial for cellular function.
  • Understanding lipid-protein interactions within membranes is essential.
  • Cholesterol plays a vital role in modulating membrane properties.

Purpose of the Study:

  • To investigate the interaction of theonellamides with cell membranes.
  • To determine if theonellamides can specifically recognize cholesterol.
  • To explore the effects of theonellamides on membrane structure and cell morphology.

Main Methods:

  • Utilized biophysical techniques to study membrane properties.
  • Investigated theonellamide binding specificity in different membrane environments.
  • Observed changes in cell morphology upon treatment with theonellamides.

Main Results:

  • Theonellamides were found to specifically recognize cholesterol.
  • These compounds modulate the order of liquid-disordered membrane environments.
  • Treatment with theonellamides induced changes in cell morphology.

Conclusions:

  • Theonellamides serve as valuable probes for studying cell membranes.
  • Their specific recognition of cholesterol offers insights into membrane organization.
  • Theonellamides can be used to investigate the dynamic nature of cell membranes.