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Related Concept Videos

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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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 Asymmetry Regulating Transporters01:19

Membrane Asymmetry Regulating Transporters

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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
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Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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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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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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Aquaporins01:25

Aquaporins

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Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
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Related Experiment Video

Updated: Apr 19, 2026

Detergent-free Ultrafast Reconstitution of Membrane Proteins into Lipid Bilayers Using Fusogenic Complementary-charged Proteoliposomes.
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Detergent-free Ultrafast Reconstitution of Membrane Proteins into Lipid Bilayers Using Fusogenic Complementary-charged Proteoliposomes.

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Full-length Tau disrupts fluid zwitterionic supported lipid bilayers.

Vicky Ury-Thiery1, Michael Molinari1, Sophie Lecomte1

  • 1Univ. Bordeaux, CNRS, Bordeaux INP, CBMN, UMR 5248, F-33600 Pessac, France.

Biophysical Chemistry
|April 17, 2026
PubMed
Summary

Tau protein interactions with neutral membranes are crucial in neurodegenerative diseases. Fluid phosphatidylcholine membranes, not charged ones, promote Tau binding and structural changes, influencing disease progression.

Keywords:
AmyloidsAtomic force microscopyPolarized ATR-FTIR spectroscopySupported lipid bilayersTau

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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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SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy
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Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions
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SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy
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Area of Science:

  • Neuroscience
  • Biochemistry
  • Cell Biology

Background:

  • The Tau protein is implicated in neurodegenerative diseases like Alzheimer's and Parkinson's.
  • Pathological Tau misfolding and aggregation into amyloid fibers lead to neuronal death.
  • Research has primarily focused on Tau aggregation with charged molecules, neglecting neutral membrane interactions.

Purpose of the Study:

  • To investigate the interaction between Tau protein and phosphatidylcholine (PC)-containing model membranes.
  • To understand how membrane fluidity influences Tau binding and structural conformation.
  • To explore a novel aspect of Tau-membrane interactions in the context of neurodegeneration.

Main Methods:

  • Utilized polarized infrared spectroscopy and atomic force microscopy.
  • Employed supported lipid bilayers of varying compositions (DOPC, DOPC:DPPC, DPPC with cholesterol) to control membrane fluidity.
  • Analyzed Tau's interaction with model membranes under different physical states.

Main Results:

  • Tau protein binds to and perturbs PC membranes.
  • This interaction and perturbation occur specifically when the membrane exhibits sufficient fluidity.
  • Tau maintains its native structural conformation during binding to fluid PC membranes.

Conclusions:

  • Membrane fluidity, particularly in phosphatidylcholine bilayers, is a key factor modulating Tau-membrane interactions.
  • Underexplored interactions with neutral membrane components like PC may significantly influence Tau pathogenicity.
  • The physical state of the cell membrane could be a critical determinant in the progression of Tau-related neurodegenerative diseases.