DeconMSn

DeconMSn determines precursor ion monoisotopic masses and charge states from tandem mass spectrometry data to improve peptide identification and refine parent ion mass tolerances in proteomics experiments.

Key Features:

• Monoisotopic mass and charge assignment: Determines the monoisotopic mass and charge state of parent ions with high precision from tandem mass spectrometry data.
• High-mass measurement accuracy refinement: Uses accurate mass information to refine parent ion mass tolerance values for high-mass accuracy experiments.
• Instrument support: Supports high-resolution Thermo Fisher Scientific LTQ_FT and LTQ_Orbitrap data as well as low-resolution LCQ and LTQ data.
• SVM-based charge detection: Implements a support-vector-machine-based charge detection algorithm to infer charge states from low-resolution fragmentation peak characteristics.
• Improved peptide identification: Enhances peptide identification accuracy by providing more accurate precursor mass and charge information.

Scientific Applications:

• Proteomics mass measurement: Supports proteomics experiments requiring precise precursor mass determination and accurate charge assignment.
• Protein characterization: Applicable to characterization of proteins in complex biological samples using high-resolution MS/MS data.
• Post-translational modification analysis: Facilitates analysis of post-translational modifications by improving precursor mass accuracy for downstream identification.

Methodology:

Analyzes tandem mass spectrometry data, refines parent ion mass tolerance values using accurate mass information, and applies a support-vector-machine-based algorithm for charge state determination from low-resolution data.