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Related Experiment Videos

A method for characterizing transition concertedness from polymer dynamics computer simulations

M L Brown1, R M Venable, R W Pastor

  • 1Department of Mathematics, Simmons College, Boston, Massachusetts 02115.

Biopolymers
|January 1, 1995
PubMed
Summary

A new statistical method reveals concerted dihedral angle transitions in lipid chains and hexadecane simulations. These non-random, correlated movements influence molecular dynamics and solute diffusion in membranes.

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Area of Science:

  • Computational chemistry
  • Statistical mechanics
  • Biophysics

Background:

  • Understanding molecular dynamics in lipid bilayers is crucial for membrane function.
  • Dihedral angle transitions are fundamental to hydrocarbon chain flexibility.

Purpose of the Study:

  • Develop a statistical method to analyze concerted dihedral angle transitions.
  • Investigate these transitions in Brownian dynamics (BD) and molecular dynamics (MD) simulations.
  • Correlate transition patterns with solute diffusion in membranes.

Main Methods:

  • Developed a statistical method classifying transitions within an "energy transfer window".
  • Analyzed BD and MD simulations of lipid acyl chains and neat hexadecane.
  • Employed statistical hypothesis testing to assess transition randomness.

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Main Results:

  • Identified significant concerted transitions between dihedral angles (2-apart and 4-apart) in simulations.
  • Observed probabilities of ~0.10 (BD) and ~0.083 (MD) for 2-apart concerted transitions.
  • Found minimal concertedness for nearest-neighbor (1-apart) and 3-apart transitions.
  • Noted qualitative similarities between lipid chains and hexadecane, with some differences in concertedness strength.

Conclusions:

  • Dihedral angle transitions in hydrocarbon chains exhibit non-random, concerted behavior.
  • Concerted transitions play a role in molecular dynamics simulations of lipids and alkanes.
  • Non-concerted transitions, facilitating larger chain displacements, may be more important for solute diffusion in membranes.