R3D-BLAST

R3D-BLAST: BLAST-like search of RNA three-dimensional structures

R3D-BLAST identifies RNA substructures in the Protein Data Bank (PDB) that are structurally similar to a query RNA 3D structure using a BLAST-adapted algorithm for three-dimensional conformations.

Key Features:

• Structural Alphabet Encoding: Encodes RNA 3D structures from the PDB into one-dimensional structural sequences using a structural alphabet of 23 distinct nucleotide conformations to represent RNA substructures.
• BLAST-like Search Mechanism: Applies BLAST to encoded structural sequences to detect similar RNA substructures within the PDB.
• PDB Input Processing: Accepts RNA three-dimensional structures in PDB format and retrieves structurally similar substructures.
• Statistical Significance Scoring: Reports E-values for each identified hit to quantify match significance.

Scientific Applications:

• RNA Structural Analysis: Supports studies of evolutionary conservation, functional motifs, and RNA interactions through identification of structurally analogous substructures.

Methodology:

Transforms three-dimensional RNA structural data into linear structural sequences based on a 23-letter nucleotide conformation alphabet, enabling sequence alignment via a BLAST-based algorithm to compare and retrieve structurally analogous RNA substructures from the PDB.