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Calculations of protein volumes: sensitivity analysis and parameter database
1Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843-2128, USA. JerryTsai@TAMU.edu
Bioinformatics (Oxford, England)
|July 16, 2002
Summary
Protein atom volumes are sensitive to calculation methods and structure quality. Higher quality protein structures yield smaller, more consistent average volumes, impacting packing volume assessments.
Area of Science:
- Biophysics
- Structural Biology
- Computational Chemistry
Background:
- Accurate protein atom volumes are crucial for understanding molecular packing.
- Previous work established standard residue volumes using Voronoi-like polyhedra.
Purpose of the Study:
- To assess the sensitivity of protein atom volume calculations to various factors.
- To determine the impact of different parameters on the reliability of volume data.
Main Methods:
- Investigated sensitivity to van der Waals radii sets.
- Evaluated criteria for atom selection (buried atoms).
- Analyzed the effect of polyhedron dividing plane methods and structure set quality.
Main Results:
- Van der Waals radii sets showed moderate effects on volume distribution and mean.
- Atom selection and dividing plane methods significantly altered protein atom volumes.
- Structure quality strongly correlated with volume results; higher quality structures yielded smaller, less variable volumes.
Conclusions:
- Protein atom volume calculations are sensitive to methodological choices.
- The quality of the input structural data is a critical determinant of volume accuracy and consistency.
- Refined methods and high-quality structures are essential for reliable protein packing volume assessments.