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Viral structural transition mechanisms revealed by multiscale molecular dynamics/order parameter extrapolation

Yinglong Miao1, Peter J Ortoleva

  • 1Center for Cell and Virus Theory, Department of Chemistry, Indiana University, Bloomington, IN 47405, USA.

Biopolymers
|September 4, 2009
PubMed
Summary
This summary is machine-generated.

A new simulation method, multiscale molecular dynamics/order parameter extrapolation (MD/OPX), reveals viral capsids shrink in a symmetry-breaking process. This energy-driven shrinkage involves local initiation and front propagation during vacuum simulations.

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Area of Science:

  • Nanoscience
  • Biophysics
  • Computational Biology

Background:

  • Simulating large bionanosystems requires methods that handle both fast atomic movements and slow collective changes.
  • Existing molecular dynamics (MD) methods can be computationally expensive for long-time simulations.

Purpose of the Study:

  • To optimize and apply the multiscale molecular dynamics/order parameter extrapolation (MD/OPX) approach.
  • To simulate and understand viral capsid structural transitions, specifically the energy-driven shrinkage of cowpea chlorotic mottle virus.

Main Methods:

  • Utilized an all-atom multiscale analysis theory of nanosystem dynamics.
  • Implemented an optimized multiscale molecular dynamics/order parameter extrapolation (MD/OPX) method.
  • Performed a 200 ns simulation of the swollen state of cowpea chlorotic mottle virus capsid in vacuum.

Main Results:

  • The MD/OPX approach successfully simulated long-time dynamics of a bionanosystem.
  • Cowpea chlorotic mottle virus capsid undergoes significant energy-driven shrinkage in vacuum.
  • The shrinkage is a symmetry-breaking process initiated locally and propagating outwards.

Conclusions:

  • The MD/OPX method is effective for simulating complex bionanosystem dynamics.
  • Viral capsid shrinkage is an energy-driven, symmetry-breaking phenomenon.
  • Understanding these transitions is crucial for virology and nanotechnology.