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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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Membrane Fluidity01:26

Membrane Fluidity

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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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Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
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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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Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

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Multi-pass Transmembrane Proteins and β-barrels01:09

Multi-pass Transmembrane Proteins and β-barrels

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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as...
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Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
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Probing molecular forces in multi-component physiological membranes.

Arjun Ray1, Frauke Gräter, Lipi Thukral

  • 1CSIR-Institute of Genomics and Integrative Biology, Mathura Road, New Delhi, 110025, India. lipi.thukral@igib.res.in.

Physical Chemistry Chemical Physics : PCCP
|November 28, 2017
PubMed
Summary
This summary is machine-generated.

Researchers explored force transmission in biological membranes using molecular dynamics simulations and Lipid-Force Distribution Analysis (L-FDA). They discovered distinct force distributions based on chemical composition, linking membrane mechanics to lipid function.

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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Area of Science:

  • Biophysics
  • Computational Biology
  • Membrane Biophysics

Background:

  • Biological membranes exhibit significant heterogeneity due to diverse lipid compositions.
  • Understanding lipid interactions is crucial for elucidating membrane mechanical properties and functions.

Purpose of the Study:

  • To investigate force transmission within complex, multi-component biological membrane models.
  • To analyze the relationship between lipid chemical structure and membrane mechanical behavior.

Main Methods:

  • Utilized molecular dynamics (MD) simulations.
  • Developed and applied a novel Lipid-Force Distribution Analysis (L-FDA) technique.
  • Segmented membrane interfaces based on chemical moieties.

Main Results:

  • Identified distinctive distributions of bonded and non-bonded forces at membrane interfaces.
  • Demonstrated that force distribution varies significantly in different membrane environments.
  • Revealed chemical-moiety specific force patterns.

Conclusions:

  • The developed molecular stress analysis provides insights into membrane mechanics.
  • Findings suggest a link between lipid chemical distinctiveness and functional states.
  • This approach has implications for understanding membrane behavior in eukaryotic organelles.