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Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
Published on: July 16, 2017
A graph theoretical approach for assessing bio-macromolecular complex structural stability.
Carlos Adriel Del Carpio1, Mihai Iulian Florea, Ai Suzuki
1Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai, Japan. carlos@aki.che.tohoku.ac.jp
Journal of Molecular Modeling
|May 2, 2009
Summary
This study introduces a new graph theory method to assess biomolecular complex stability by measuring increased rigidity in interacting parts. This approach helps predict molecular function and rank complex structures.
Area of Science:
- Biophysics
- Structural Biology
- Computational Biology
Background:
- Assessing biomolecular complex structural rigidity is crucial for predicting molecular function and designing scoring functions.
- Existing methods for molecular flexibility analysis, like graph theory, provide a foundation for stability studies.
Purpose of the Study:
- To develop a novel scheme for analyzing the structural stability of biomolecular complexes.
- To quantify changes in rigidity upon complex formation using new indices.
- To validate the proposed indices and apply them for ranking protein complex decoys.
Main Methods:
- Utilizing a graph theoretical approach based on existing work on molecular flexibility.
- Identifying clusters of flexible amino acids in interacting subunits that become more rigid upon complex formation.
- Expanding the network of interactions to include inter-molecular terms to evaluate rigidity gains.
- Proposing two indices: a local index for amino acid-level rigidity and a global index for overall complex stability.
Main Results:
- Demonstrated that gains in structural rigidity upon complex formation can be quantified.
- Developed and validated two indices for measuring localized and global structural stability.
- Successfully used the indices as scoring coefficients to rank automatically generated protein complex decoys.
Conclusions:
- The proposed graph theoretical scheme effectively analyzes biomolecular complex structural stability.
- The developed indices provide a robust measure of rigidity changes and can be applied to predict function and guide complex design.
- This method offers a rapid and accurate way to assess structural stability for various biomolecular applications.
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