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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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Interaction forces and adhesion of supported myelin lipid bilayers modulated by myelin basic protein

Younjin Min1, Kai Kristiansen, Joan M Boggs

  • 1Department of Chemical Engineering, University of California, Santa Barbara, CA 93106, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 17, 2009
PubMed

Insights

Optimal myelin function relies on balancing myelin basic protein (MBP) and charged lipids. Imbalances in MBP or lipids disrupt adhesion, potentially causing demyelination.

Area of Science:

  • Biophysics
  • Neuroscience
  • Materials Science

Background:

  • Myelin's structure is crucial for nerve impulse conduction.
  • Myelin basic protein (MBP) plays a key role in myelin organization.
  • Understanding the physical forces governing myelin structure is essential.

Purpose of the Study:

  • To investigate the role of myelin basic protein (MBP) in lipid bilayer adhesion.
  • To determine the optimal conditions for myelin organization based on lipid-protein interactions.
  • To explore the relationship between adhesion forces and myelin structure.

Main Methods:

  • Force-distance measurements using supported lipid bilayers.
  • Mimicking the cytoplasmic surface of myelin.
  • Varying surface coverages of myelin basic protein (MBP).

Main Results:

  • Maximum adhesion and minimal spacing occurred at an optimal lipid/protein ratio, facilitating MBP binding to negatively charged lipids.
  • Hydrophobic, van der Waals, and dipolar interactions contribute to adhesion at optimal ratios.
  • Deviations from the optimal ratio (MBP depletion or excess) led to decreased adhesion and increased spacing, with excess MBP forming a weak gel.

Conclusions:

  • Myelin organization and function are governed by physical noncovalent forces.
  • An optimal balance of charged lipids and MBP is critical for maintaining myelin adhesion and structure.
  • Both excess and deficit of MBP or anionic lipids can compromise myelin adhesion, potentially contributing to demyelination.

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