LutefiskXP

LutefiskXP performs de novo peptide sequencing from CID (Collision-Induced Dissociation) tandem mass spectrometry (MS/MS) spectra to derive peptide sequences when no exact matches exist in protein databases.

Key Features:

• De Novo Sequencing: Deduces peptide sequences directly from MS/MS (CID) spectra without relying on pre-existing sequence databases.
• Handling Sequence Ambiguities: Incorporates a modified/enhanced FASTA algorithm adapted to manage ambiguities in tandem mass spectrometry data for homologous non-exact searches.
• Automated Deduction: Automates the inference of peptide sequences from fragmentation patterns in CID MS/MS spectra.

Scientific Applications:

• Novel Protein Identification: Enables discovery of previously uncharacterized proteins by sequencing spectra that lack database matches.
• Proteomic Variability Studies: Supports analysis of inter-species variations and unexpected proteolytic cleavages by interpreting ambiguous spectra.
• Database Error Correction: Identifies discrepancies between observed MS/MS spectra and protein database entries to inform sequence database refinement.

Methodology:

Analyzes fragmentation patterns in CID (Collision-Induced Dissociation) MS/MS spectra to deduce peptide sequences and employs a modified/enhanced FASTA algorithm adapted for MS/MS ambiguities to perform homologous non-exact searches.