Phosfinder

PhosFinder identifies phosphate-binding sites in protein structures by structural comparison against a database of known three-dimensional phosphate-binding motifs.

Key Features:

• Structural comparison algorithm: Performs structural comparisons between query protein structures and known phosphate-binding motifs to detect structural similarities.
• Database of known three-dimensional phosphate-binding motifs: Uses an extensive collection of experimentally observed 3D phosphate-binding motifs as templates for detection.
• Motif-guided phosphate placement: When a structural similarity is identified, the phosphate bound by the matched motif is virtually added to the query structure to indicate potential binding sites.
• Evaluation by solvent-excluded surface: Assesses predicted sites based on their spatial relationship to the solvent-excluded surface of the query protein.
• Residue conservation assessment: Evaluates the conservation status of residues involved in predicted binding within the protein family.
• Validation on apo/holo pairs: Validated on 52 apo/holo structure pairs, demonstrating robustness to ligand-induced conformational changes.

Scientific Applications:

• Phosphate-binding site identification: Predicts locations of phosphate-binding sites in protein structures using motif-based structural comparison.
• Protein–ligand interaction analysis: Provides structural hypotheses for phosphate interactions to support studies of protein–ligand binding mechanisms.
• Functional annotation and evolutionary analysis: Assesses conservation of binding residues to inform functional annotation within protein families.
• Assessing effects of conformational change: Evaluates potential phosphate-binding sites resilient to ligand-induced conformational changes.

Methodology:

PhosFinder uses a structural comparison algorithm to scan query protein structures against a database of known three-dimensional phosphate-binding motifs; when matches are found it virtually adds the motif's bound phosphate to the query structure and evaluates predicted sites based on solvent-excluded surface proximity and residue conservation.