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Characterizing conserved structural contacts by pair-wise relative contacts and relative packing groups
1Laboratory of Molecular Genetics NICHD-NIH, Bethesda, MD 20952, USA.
Journal of Molecular Biology
|November 5, 2005
Summary
This study introduces a new method to analyze protein side-chain packing using relative contacts between residue pairs. This approach accurately differentiates protein structures and links sequence changes to structural variations.
Area of Science:
- Structural Biology
- Computational Biology
- Biophysics
Background:
- Protein structure and function are determined by complex side-chain interactions.
- Existing methods for analyzing protein packing face challenges due to this complexity.
Purpose of the Study:
- To develop a novel method for characterizing protein packing within fold families.
- To analyze the relationship between sequence identity and structural changes.
Main Methods:
- Developed a method based on pair-wise relative contacts of interacting side-chain pairs.
- Constructed relative packing groups by superimposing pair-wise contacts around single residues.
- Applied the method to globin-like superfamilies and heme binding globin families using SCOP database.
Main Results:
- The method successfully differentiated between protein fold classes.
- Pair-wise relative contacts showed a strong correlation with sequence identity.
- Relative packing groups aided in assessing structural alignment quality and structural randomness.
Conclusions:
- The novel method provides a robust framework for analyzing protein packing and its relationship to sequence.
- This approach facilitates a deeper understanding of structure-sequence correlations.
- The method has implications for improving sequence and structure alignment assessments.