3dLOGO

3dLOGO identifies conserved three-dimensional protein substructures and derives structural motifs by analyzing residue sets from Protein Data Bank (PDB) structures across multiple protein structures.

Key Features:

• Conserved Substructure Detection: Identifies matching three-dimensional substructures in a user-provided set of protein structures based on residue sets from a PDB chain.
• Multiple Structure Alignment: Generates a multiple structural alignment centered on detected conserved substructures to reveal additional structurally conserved residues after superposition.
• 3D Structural Logo Representation: Uses the 3dProLogo application to represent residue structural conservation as a three-dimensional sequence logo.
• Structural Motif and Pattern Derivation: Proposes conserved residues to identify functional regions, refine structural motifs, and derive sequence patterns.

Scientific Applications:

• Protein Family Structural Analysis: Identifies conserved structural features in protein families such as SH2 and SH3 binding pockets and p-loop motifs.
• Pattern Database Optimization: Improves sensitivity and specificity of motif databases such as PROSITE by identifying structurally conserved residues not detected by sequence alignment.
• Local Structural Comparison: Supports local comparisons of protein structures to identify shared structural features associated with common biological functions.

Methodology:

3dLOGO detects structurally conserved residues from input PDB residue sets across multiple protein structures, generates structure-centered alignments, and constructs extended sequence patterns optimized for sensitivity and specificity against databases such as SWISS-PROT.