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Globular Proteins01:27

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Hydration dependent dynamics in sol-gel encapsulated myoglobin.

Giorgio Schirò1, Michele Sclafani, Francesca Natali

  • 1Department of Physical and Astronomical Sciences, CNISM and University of Palermo, Via Archirafi, 36, 90123 Palermo, Italy.

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Protein dynamics are altered by confinement within silica matrices, with hydration levels significantly impacting this effect. Maximum changes occur at full first shell hydration, suggesting solvent properties are key.

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Area of Science:

  • Biophysics
  • Materials Science
  • Protein Dynamics

Background:

  • Protein dynamics are crucial for biological function.
  • Confinement in porous materials can alter protein behavior.
  • Hydration plays a key role in protein structure and dynamics.

Purpose of the Study:

  • To investigate the impact of hydration on protein dynamics within a confined geometry.
  • To compare the dynamics of encapsulated met-myoglobin with its powder forms.
  • To understand the role of the surrounding solvent in confinement effects.

Main Methods:

  • Elastic neutron scattering was used to measure mean square displacements.
  • Sol-gel encapsulated met-myoglobin at various hydration levels was studied.
  • Data analysis employed a model of dynamical heterogeneity.

Main Results:

  • Sol-gel confinement reduces large-scale protein motions above 230 K.
  • The confinement effect is strongly dependent on hydration, peaking at 35% water/protein.
  • Hydration-dependent dynamics were observed even in encapsulated met-myoglobin.

Conclusions:

  • Sol-gel confinement significantly modifies protein dynamics, primarily by restricting large-scale motions.
  • The degree of this modification is critically dependent on the hydration level of the protein.
  • Confinement effects are largely mediated by changes in the co-encapsulated solvent's properties rather than direct protein-matrix interactions.