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Protein hydration in solution: experimental observation by x-ray and neutron scattering
D I Svergun1, S Richard, M H Koch
1European Molecular Biology Laboratory, Hamburg Outstation, Notkestrasse 85, D-22603 Hamburg, Germany. Svergun@EMBL-Hamburg.DE
Summary
This study experimentally characterized the protein-solvent interface, revealing a denser first hydration shell around proteins. This finding suggests a general property of aqueous interfaces, impacting protein behavior.
Area of Science:
- Biophysics
- Structural Biology
- Physical Chemistry
Background:
- The precise structure of the protein-solvent interface remains debated in theoretical models.
- Direct experimental validation is crucial for understanding protein hydration and interactions.
Purpose of the Study:
- To experimentally determine the structural characteristics of the protein-solvent interface.
- To investigate the density and properties of the first hydration shell surrounding proteins.
Main Methods:
- Utilized X-ray and neutron scattering techniques on three distinct proteins (lysozyme, E. coli thioredoxin reductase, R1 ribonucleotide reductase).
- Performed experiments in both H2O and D2O solutions to leverage differential scattering contrasts.
- Analyzed scattering data focusing on the distinct densities of the protein and its hydration shell.
Main Results:
- Demonstrated the existence of a distinct first hydration shell around the studied proteins.
- Quantified the average density of this hydration shell to be approximately 10% higher than bulk solvent.
- The observed hydration shell properties were consistent across different proteins and solvent conditions.
Conclusions:
- The protein-solvent interface exhibits a denser first hydration shell than previously assumed.
- This denser hydration shell may be a general characteristic of aqueous protein interfaces.
- Findings provide critical experimental data to refine theoretical models of protein hydration.