XTandem

XTandem matches tandem mass spectra (MS/MS) to peptide sequences to identify and characterize peptides and proteins in proteomics experiments.

Key Features:

• Sequence Matching: Correlates MS/MS spectra with peptide sequences derived from protein sequence databases.
• Advanced Matching Algorithms: Employs algorithms to match spectra with known protein sequences despite incomplete fragment information.
• Theoretical Spectrum Comparison: Compares experimental spectral data against theoretical spectra derived from candidate peptide sequences to evaluate matches.
• Algorithm Testing Platform: Provides a framework for testing and developing spectral-matching algorithms.

Scientific Applications:

• Peptide Identification: Identifies peptides in complex biological samples by matching MS/MS spectra to sequences.
• Protein Characterization: Aids elucidation of protein structures and functions through peptide-level identifications.
• Biomarker Discovery: Supports biomarker discovery by enabling detection and identification of proteins present in samples.
• Disease Pathology Studies: Enables investigation of disease-associated proteomic changes via peptide and protein identification.
• Drug Development: Assists drug development by characterizing proteomes and potential protein targets.

Methodology:

Analyzes tandem mass spectra generated from fragmented peptide ions and compares experimental spectra against theoretical spectra derived from potential peptide sequences, using matching algorithms to identify peptides and associated protein sequences.