MODi

MODi interprets tandem mass spectra to identify post-translational modifications (PTMs) in peptides, accommodating Unimod entries, user-defined modifications, and multiple PTM site assignments for proteomics analyses.

Key Features:

• Comprehensive PTM support: Analyzes tandem mass spectra against an extensive list of PTMs including Unimod and user-defined modifications.
• Multiple PTM site identification: Assigns multiple modification sites within a single spectrum to capture combinatorial peptide modifications.
• Input format compatibility: Accepts .mzXML, .dta, .pkl, and .mgf input file formats.

Scientific Applications:

• PTM profiling: Supports proteomics studies aimed at identifying and characterizing post-translational modifications.
• Novel modification discovery: Enables detection and analysis of noncanonical or previously uncharacterized modifications.
• Protein variant characterization: Assists in identifying modified protein isoforms and site-specific modification patterns.
• Disease mechanism investigation: Facilitates study of aberrant PTMs implicated in disease processes.

Methodology:

Uses advanced algorithms to interpret complex tandem mass spectra by simultaneously considering a wide range of modification types and potential modification sites.