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Protein Folding01:22

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Simulating protein unfolding under pressure with a coarse-grained model.

Ramiro Perezzan1, Antonio Rey

  • 1Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense, E-28040 Madrid, Spain.

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High pressure induces a novel swollen state in proteins, distinct from native or denatured forms. This finding reveals new protein phase behavior under pressure, impacting molecular simulations and biophysics.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Molecular Dynamics

Background:

  • Understanding protein folding/unfolding transitions is crucial in molecular biology.
  • Pressure effects on protein stability are significant but complex to model.
  • Existing models often lack detailed representation of pressure-induced structural changes.

Purpose of the Study:

  • To develop and validate a coarse-grained molecular model for simulating pressure effects on protein transitions.
  • To investigate the thermodynamic and structural consequences of pressure on protein stability.
  • To elucidate the mechanism of pressure-induced protein unfolding.

Main Methods:

  • Development of a structure-based coarse-grained molecular model.
  • Incorporation of desolvation barriers for native contact formation.
  • Mean-field approach to model pressure effects on stabilizing interactions.
  • Parallel tempering Monte Carlo simulations of protein GB1.

Main Results:

  • The model accurately reproduces the two-state thermal transition at low pressures.
  • A novel 'swollen' native state emerges at high pressures.
  • This swollen state is in equilibrium with the native state at low temperatures.
  • A downhill transition from the swollen to the denatured state is observed with increasing temperature.
  • A pressure-temperature phase diagram consistent with experimental observations for real proteins was generated.

Conclusions:

  • The developed coarse-grained model effectively simulates pressure-induced protein structural changes.
  • High pressure can stabilize a unique swollen protein state.
  • The model provides insights into the complex pressure-temperature phase behavior of proteins.