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Updated: May 28, 2026

Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group
Published on: August 16, 2017
CAPS-DB: a structural classification of helix-capping motifs.
Joan Segura1, Baldomero Oliva, Narcis Fernandez-Fuentes
1Leeds Institute of Molecular Medicine, Section of Experimental Therapeutics, University of Leeds, St James's University Hospital, Leeds LS9 7TF, UK.
Nt- and Ct cappings stabilize alpha-helices by forming structural motifs. CAPS-DB classifies these patterns using geometry and conformation, aiding protein design and bioinformatics research.
Area of Science:
- Structural biology
- Bioinformatics
- Protein engineering
Background:
- Alpha-helices are crucial protein structures stabilized by capping regions (Nt- and Ct cappings).
- Capping regions lack intrahelical hydrogen bonds, making them critical for helix stability.
- While amino acid preferences for cappings are known, their associated structural motifs remain unclassified.
Purpose of the Study:
- To classify and provide access to structural motifs of protein alpha-helix cappings.
- To develop a database (CAPS-DB) for storing and retrieving structural patterns of cappings.
Main Methods:
- Clustering of structural patterns based on geometry and (Φ-ψ)-space conformation.
- Development of a relational database (CAPS-DB) for data management.
Main Results:
- CAPS-DB successfully clusters structural patterns of Nt- and Ct cappings.
- The database allows searching, browsing, inspection, and retrieval of structural data for cappings.
Conclusions:
- CAPS-DB provides a valuable resource for understanding alpha-helix capping structural motifs.
- This database can support advancements in protein design, engineering, structural biology, and bioinformatics.
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