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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%...
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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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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...
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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Published on: July 22, 2015

Steric pressure between membrane-bound proteins opposes lipid phase separation.

Christine S Scheve1, Paul A Gonzales, Noor Momin

  • 1Department of Biomedical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.

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|January 17, 2013
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Protein crowding in cellular membranes can disrupt lipid rafts, preventing protein concentration. This steric pressure destabilizes membrane domains, impacting cellular processes and challenging the raft concentrator model.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Cellular membranes contain numerous proteins within a complex lipid environment.
  • Lipid rafts, specialized membrane domains, are hypothesized to organize proteins and lipids.
  • The protein-concentrating ability of lipid rafts remains experimentally unquantified.

Purpose of the Study:

  • To experimentally investigate the role of protein crowding in lipid raft stability.
  • To quantify the effect of protein-protein interactions on phase-separated membrane domains.
  • To understand the energetic balance governing membrane organization.

Main Methods:

  • Utilized a reconstituted system with lipid vesicles and recombinant proteins.
  • Applied biophysical techniques to observe membrane domain behavior under varying protein densities.
  • Employed an analytical model for theoretical comparison.

Main Results:

  • High protein density within liquid-ordered membrane regions leads to destabilization of lipid phase separations.
  • Protein-protein steric pressure acts as an energetic barrier to raft stability, increasing with protein molecular weight.
  • Membrane domains become homogeneous when steric pressure surpasses the enthalpy of membrane mixing.

Conclusions:

  • Steric pressure from crowded membrane proteins can overcome lipid phase separation, leading to homogeneous distributions.
  • The stability of phase-separated cellular membranes is governed by a balance of free energies.
  • This finding offers a new perspective on the functional role of lipid rafts in membrane organization.