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T-wave Ion Mobility-mass Spectrometry: Basic Experimental Procedures for Protein Complex Analysis
Published on: July 31, 2010
Partial molar volume of proteins studied by the three-dimensional reference interaction site model theory
Takashi Imai1, Andriy Kovalenko, Fumio Hirata
1Department of Bioscience and Bioinformatics, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan.
The Journal of Physical Chemistry. B
|July 21, 2006
Summary
The three-dimensional reference interaction site model (3D-RISM) theory quantifies protein hydration effects on partial molar volume. Hydration contributions correlate with protein surface properties like accessible surface area and charged groups.
Area of Science:
- Computational chemistry
- Biophysics
- Structural biology
Background:
- Understanding protein partial molar volume is crucial for biophysical and biochemical applications.
- Hydration significantly influences protein structure and function.
- Existing methods often lack detailed molecular insights into hydration contributions.
Purpose of the Study:
- To apply the 3D-RISM theory to analyze hydration effects on protein partial molar volume.
- To decompose partial molar volume into geometric and hydration contributions.
- To investigate the relationship between hydration and protein surface properties.
Main Methods:
- Utilized the three-dimensional reference interaction site model (3D-RISM) theory.
- Combined 3D-RISM with geometric volume calculations for native protein structures.
- Analyzed hydration contributions in relation to protein surface characteristics.
Main Results:
- Partial molar volume was successfully decomposed into geometric and hydration components.
- Hydration contributions were found to correlate with protein surface properties.
- Thermal volume showed direct proportionality to accessible surface area.
- Interaction volume was primarily influenced by charged atomic groups on the protein surface.
Conclusions:
- 3D-RISM theory provides a robust framework for dissecting hydration effects on protein partial molar volume.
- Protein surface properties, particularly charged and accessible areas, dictate hydration contributions.
- The method offers insights into pressure-induced structural changes, as demonstrated with lysozyme.
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