R3DCID: circular interaction diagrams for RNA and DNA 3D structures of all sizes

Area of Science:

• Structural Biology
• Bioinformatics
• Computational Biology

Background:

• The Protein Data Bank (PDB) contains over 21,000 3D structures of nucleic acids, featuring diverse complexities in chain numbers, nucleotide counts, and interaction types.
• Understanding the intricate network of intra- and inter-chain interactions within large nucleic acid structures is challenging due to their scale and complexity.

Purpose of the Study:

• To introduce R3DCID (RNA+DNA 3D structure Circular Interaction Diagram), a novel web service for visualizing pairwise interactions in nucleic acid 3D structures.
• To provide a uniform and interpretable representation of interactions across various nucleic acid structures, regardless of size or complexity.

Main Methods:

• Development of a web service that generates circular arc diagrams representing pairwise interactions.
• The service processes all chains, models, assemblies, and symmetries within each PDB nucleic acid entry.
• Output is available in PDF and SVG formats for efficient viewing and scalability.

Main Results:

• R3DCID produces consistent circular interaction diagrams for all analyzed nucleic acid structures.
• The generated diagrams offer a clear overview of structural organization and detailed interaction maps.
• The tool supports understanding of both Watson-Crick and non-Watson-Crick basepairing and base-backbone interactions.

Conclusions:

• R3DCID offers a valuable new perspective for exploring and comprehending the 3D architecture of RNA and DNA.
• The tool serves as both a guide to overall structure and a detailed map of functionally critical interactions.
• This visualization method enhances the study of nucleic acid structure-function relationships.