PIUS

PIUS identifies peptides from tandem mass spectrometry (MS/MS) data by matching spectra to six-frame translations of a complete genome for genome-wide peptidomics analysis.

Key Features:

• Exhaustive Genomic Search: Conducts searches across all six reading frames of a complete genome to generate candidate peptide sequences.
• MS/MS Spectrum Matching: Matches tandem mass spectrometry (MS/MS) spectra to translated genomic sequences to produce peptide-spectrum matches.
• Natural Peptide Identification: Targets identification of peptides that may originate outside annotated protein-coding regions, including non-coding genomic contexts.
• Unrestricted Search Space: Expands search space beyond predefined sequence sets and de novo peptide reconstructions by using genome-wide six-frame translation.

Scientific Applications:

• Exploratory Peptidomics: Investigating novel peptide origins and functions that are not evident through traditional proteomic reference databases.
• Microbiome Studies: Identifying peptides within complex microbial communities by leveraging whole-genome translations of constituent organisms.
• Functional Genomics: Exploring potential peptide products from non-coding genomic regions to inform genome functionality beyond annotated proteins.

Methodology:

Performs six-frame translation of a complete genome and conducts exhaustive searches that match tandem MS/MS spectra to the translated sequences, without restricting candidates to annotated proteins or predefined/de novo-derived sequence sets.