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Intersecting polymers in lipid bilayers: cliques, static order parameters and lateral diffusion

D A Pink1, R Merkel, B Quinn

  • 1Department of Physics, St. Francis Xavier University, Antigonish, Nova Scotia, Canada.

Biochimica Et Biophysica Acta
|August 15, 1993
PubMed
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This study models macrolipid polymers, revealing that bond crossings scale with polymer length, independent of concentration. At high concentrations, macrolipid chains form larger clusters, impacting system viscoelasticity.

Area of Science:

  • Polymer Physics
  • Materials Science
  • Biophysics

Background:

  • Macrolipid polymers are formed by polymerizing lipid molecules within lipid bilayers or monolayers.
  • Fluctuations in lipid bilayers allow for potential self-intersection of polymer chains when projected onto the bilayer plane.

Purpose of the Study:

  • To model macrolipid polymers using a triangular lattice representation.
  • To investigate the conformational properties and connectivity of macrolipid polymers via computer simulations.
  • To analyze the dependence of bond crossings and cluster formation on polymer length and concentration.

Main Methods:

  • Computer simulations employing the Carmesin-Kremer bond stretching algorithm.
  • Representation of the lipid bilayer/monolayer as a triangular lattice.

Related Experiment Videos

  • Analysis of bond crossings (self-crossing and mutual-crossing) and clique size.

    • Main Results:

    • Bond crossings scale linearly with macrolipid length (N), independent of monomer concentration.
    • The exponent sigma_c, related to bond crossings, was found to be approximately 0.52, supporting a theoretical value of 1/2.
    • At high concentrations and sufficient macrolipid length, larger clusters (cliques) form, indicating increased connectivity.

    Conclusions:

    • The number of bond crossings in macrolipid polymers is primarily dependent on polymer length, not concentration.
    • Macrolipid chain length and concentration influence the formation of interconnected clusters, affecting system properties.
    • The findings suggest potential implications for the viscoelastic properties of macrolipid systems.