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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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Lipids as Anchors01:32

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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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Membrane Lipids01:32

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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
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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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Membrane-Inserting α‑Lipid Polymers: Understanding Lipid Membrane Insertion and Effect on Membrane Fluidity.

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Alpha-lipid polymers, used in drug delivery, increase cell membrane fluidity. Their structure, particularly the cholesterol anchor and shorter hydrophilic chain, enhances membrane association and fluidity.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Membrane Biophysics

Background:

  • Alpha-lipid polymers, featuring a lipid residue and a hydrophilic polymer chain, are vital in biological and pharmaceutical applications.
  • Their integration into lipid membranes is fundamental to liposomal formulations and target identification in drug discovery.

Purpose of the Study:

  • To investigate the relationship between the molecular structure of inserting alpha-lipid polymers and their impact on lipid membrane properties.
  • To understand how different membrane-inserting anchors and hydrophilic chain lengths affect membrane association and fluidity.

Main Methods:

  • Synthesis of hydrophilic (co)-polymers with neutral or acidic monomers and terminal cholesteryl (Chol) or DOPE phospholipid anchors.
  • Structure-function analysis using laurdan generalized polarization, flow cytometry, solid-state NMR, surface plasmon resonance, and in silico modeling.

Main Results:

  • Alpha-lipid polymer insertion increases fluidity in artificial and cell plasma membranes (Caco-2).
  • Cholesterol anchors exhibit faster and stronger membrane association than DOPE anchors.
  • Shorter polymer chains (DP=50 vs. DP=100) show higher membrane association and increase bilayer fluidity more significantly (1.3- to 2.2-fold).

Conclusions:

  • The molecular structure of alpha-lipid polymers, specifically the anchor type and chain length, dictates membrane interaction and fluidity.
  • Cholesterol anchors and shorter chains enhance membrane association and fluidity, with fluidity increase attributed to disrupted lipid organization near insertion.
  • Findings are crucial for designing drug formulations and understanding liposomal stability and cargo retention in biological systems.