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Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
Published on: July 16, 2017
REACH coarse-grained normal mode analysis of protein dimer interaction dynamics.
Kei Moritsugu1, Vandana Kurkal-Siebert, Jeremy C Smith
1Center for Molecular Biophysics, University of Tennessee/Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA. moritsuguk@riken.jp
Biophysical Journal
|August 19, 2009
Summary
The Realistic Extension Algorithm via Covariance Hessian (REACH) models protein dynamics efficiently. This coarse-grained method accurately captures interprotein dynamics, revealing how interface strength affects molecular vibrations.
Area of Science:
- Biophysics
- Computational Biology
- Structural Biology
Background:
- Multiscale modeling is crucial for understanding complex biomolecular systems.
- Coarse-grained methods simplify simulations while retaining essential dynamics.
- Protein-protein interactions are fundamental to biological processes.
Purpose of the Study:
- To apply the REACH method for calculating protein-protein interaction dynamics.
- To validate REACH by comparing its results with atomistic simulations.
- To investigate the relationship between protein structure and interprotein dynamics.
Main Methods:
- Realistic Extension Algorithm via Covariance Hessian (REACH) coarse-grained modeling.
- Mapping atomistic molecular dynamics to residue-scale models.
- Analysis of intra- and intermolecular fluctuations and vibrational densities of states.
- Lattice dynamics modeling for crystalline proteins.
Main Results:
- REACH accurately reproduces intra- and intermolecular fluctuations and vibrational densities of states.
- REACH normal modes align well with atomistic molecular dynamics.
- Phonon dispersion relations from REACH show satisfactory agreement with all-atom results.
- Increased dimer interaction strength reduces vibrational amplitudes but not frequencies.
Conclusions:
- REACH is a reliable multiscale method for studying protein-protein interaction dynamics.
- Extensive interfaces in biological dimers reduce intermonomer vibrational amplitudes, not frequencies.
- REACH provides insights into the structure-dynamics relationship of interacting proteins.
