Mobile Block Hessian Approach with Adjoined Blocks: An Efficient Approach for the Calculation of Frequencies in
A Ghysels1, V Van Speybroeck1, E Pauwels1
1Center for Molecular Modeling, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium, and Laboratory of Computational Biology, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892.
Journal of Chemical Theory and Computation
|November 27, 2015
Summary
This study introduces an extended mobile block Hessian (MBH) method for calculating molecular vibrational modes. The enhanced approach accurately analyzes biomolecules like proteins by treating groups of residues as rigid bodies.
Area of Science:
- Computational Chemistry
- Molecular Dynamics
- Biophysics
Background:
- The mobile block Hessian (MBH) approach was previously developed for vibrational mode calculations of partially optimized molecular structures.
- Standard MBH considers blocks of atoms as rigid bodies with six degrees of freedom.
Purpose of the Study:
- To introduce an extended MBH approach with reduced degrees of freedom for enhanced vibrational analysis.
- To enable normal-mode analysis of large biomolecules, particularly proteins, by hypothesizing low-frequency modes as rigid-body motions.
Main Methods:
- Developed an extended MBH approach where blocks can be connected by one or two atoms, reducing degrees of freedom.
- Validated the method on small molecules, alanine dipeptide, crambin (46 residues), and ICE/caspase-1 (518 residues).
Main Results:
- The extended MBH method successfully calculated vibrational modes for various molecular systems.
- Demonstrated the applicability of the approach to increasingly complex biomolecules, including large proteins.
Conclusions:
- The extended MBH approach provides an accurate and efficient method for vibrational analysis of partially optimized structures.
- This method is particularly promising for studying the dynamics and vibrational properties of large biomolecules like proteins.
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