COGNAC: a web server for searching and annotating hydrogen-bonded base interactions in RNA three-dimensional...

Area of Science:

• Structural Biology
• Bioinformatics
• Computational Chemistry

Background:

• Hydrogen bonds are essential for stabilizing the 3D structure of ribonucleic acid (RNA).
• Variations in hydrogen bond interactions can arise from minor conformational changes.
• Networks of hydrogen bonds, particularly clustered ones, may represent key tertiary motifs for RNA stability and function.

Purpose of the Study:

• To develop and present a graph theoretical algorithm for identifying unbroken hydrogen-bonded base interaction networks in RNA 3D structures.
• To provide a tool for quantifying hydrogen bond interactions within RNA.
• To enable comparison of hydrogen bond networks between different RNA structures.

Main Methods:

• Implementation of a graph theoretical algorithm as a web server named COGNAC (COnnection tables Graphs for Nucleic ACids).
• The algorithm searches for and accounts for hydrogen-bonded base interaction networks.
• The server facilitates comparison of hydrogen bond networks between two RNA structures.

Main Results:

• COGNAC successfully identifies and quantifies hydrogen bond networks in RNA 3D structures.
• The server enables the mapping of atomic-level differences between structures.
• These differences can be correlated with conformational changes due to mutations or binding events.

Conclusions:

• COGNAC provides a novel computational approach for analyzing RNA structural features.
• The tool aids in understanding the impact of conformational changes on RNA structure and function.
• COGNAC is accessible online for researchers studying RNA.