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Related Experiment Videos

Viral self-assembly as a thermodynamic process.

Robijn F Bruinsma1, William M Gelbart, David Reguera

  • 1Department of Physics and Astronomy, The University of California at Los Angeles, Los Angeles, California 90095-1569, USA.

Physical Review Letters
|July 15, 2003
PubMed
Summary
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Viral capsids achieve icosahedral symmetry not from identical proteins, but from proteins with at least two internal configurations. This symmetry requires specific structural parameter optimization, not just free energy minimization.

Area of Science:

  • Biophysics
  • Structural Biology
  • Computational Biology

Background:

  • Nearly all spherical viruses exhibit icosahedral symmetry in their protein shells (capsids).
  • Understanding the self-assembly principles governing viral capsid formation is crucial in virology.

Purpose of the Study:

  • To propose a statistical thermodynamic model for viral self-assembly.
  • To investigate the conditions required for achieving icosahedral symmetry in viral capsids.

Main Methods:

  • Development of a statistical thermodynamic model for protein self-assembly.
  • Analysis of the energetic and structural requirements for capsid symmetry.

Main Results:

  • Icosahedral symmetry is not an inherent property of capsids made from identical protein subunits.

Related Experiment Videos

  • The emergence of icosahedral symmetry necessitates at least two distinct internal structural configurations within the protein subunits.
  • Viral capsid icosahedral symmetry is not a default outcome of free energy minimization.

    • Conclusions:

    • Icosahedral symmetry in viral capsids is an optimized structural feature, not a generic thermodynamic consequence.
    • Specific optimization of internal structural parameters of capsid proteins is essential for achieving icosahedral symmetry.