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Related Experiment Videos

Harmonicity and anharmonicity in protein dynamics: a normal mode analysis and principal component analysis

S Hayward1, A Kitao, N Go

  • 1Department of Chemistry, Faculty of Science, Kyoto University, Japan.

Proteins
|October 1, 1995
PubMed
Summary

Protein dynamics reveal distinct harmonic and anharmonic motions. Anharmonic modes, though few, dominate fluctuations, suggesting a rescaled parabolic free energy surface in simulations.

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Area of Science:

  • Computational Biology
  • Protein Dynamics
  • Molecular Simulation

Background:

  • Understanding protein dynamics is crucial for function.
  • Distinguishing harmonic and anharmonic motions aids in accurate modeling.
  • Previous analyses often focused on harmonic approximations.

Purpose of the Study:

  • To compare normal mode analysis (NMA) and principal component analysis (PCA).
  • To elucidate harmonic and anharmonic aspects in protein dynamics.
  • To define and quantify protein anharmonicity.

Main Methods:

  • 200-ps molecular dynamics (MD) trajectory of bovine pancreatic trypsin inhibitor (BPTI) in vacuum.
  • Normal Mode Analysis (NMA).
  • Principal Component Analysis (PCA).

Related Experiment Videos

  • Definition of an anharmonicity factor.

    • Main Results:

    • Principal modes naturally separate into harmonic (>80 cm-1) and anharmonic (<80 cm-1) modes.
    • Anharmonic modes (12% of variables) account for 98% of total mean-square fluctuation.
    • Protein free energy surface approximated by a rescaled parabola.
    • Simulation suggests mean-square fluctuation is twice that predicted by NMA.

    Conclusions:

    • Anharmonicity plays a significant role in protein dynamics, particularly at low frequencies.
    • PCA effectively distinguishes harmonic and anharmonic motions.
    • The free energy landscape of proteins can be approximated by a rescaled harmonic model.