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Hydration in protein crystallography

B P Schoenborn1, A Garcia, R Knott

  • 1Los Alamos National Laboratory, New Mexico, USA.

Progress in Biophysics and Molecular Biology
|January 1, 1995
PubMed
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Ordered water molecules near protein surfaces are crucial for protein function and stability. Advanced crystallographic methods reveal these bound waters, showing limited mobility despite bulk solvent disorder.

Area of Science:

  • Structural biology
  • Biophysics
  • Crystallography

Background:

  • Water near protein surfaces is essential for protein folding, stability, recognition, and activity.
  • Crystallographic studies reveal ordered water molecules around charged, polar, and hydrophobic amino acids.

Purpose of the Study:

  • To investigate the role and characteristics of bound structural water molecules in protein structures.
  • To explore recent advancements in analyzing bulk solvent contributions for better surface structure evaluation.

Main Methods:

  • Analysis of crystallographic data, including treatment of bulk solvent contributions.
  • Evaluation of protein surface structure and localization of bound waters.
  • Study of bound water mobility using temperature and occupancy factors.

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Main Results:

  • Ordered water molecules are observed around various amino acid types, particularly at crystal interfaces for hydrophobic residues.
  • Recent developments allow for improved evaluation of protein surface structure and bound water localization.
  • Bound water layers surrounding proteins exhibit limited mobility, contrasting with the disordered bulk solvent.

Conclusions:

  • Bound structural water molecules play a significant role in protein structure and function.
  • Advanced crystallographic data analysis enhances the understanding of protein-water interactions.
  • The limited mobility of bound waters suggests their integral role in maintaining protein conformation and activity.