ProteoformClassifier

ProteoformClassifier classifies proteoform identifications using a five-level system to delineate ambiguity in proteoform assignments for mass spectrometry–based proteomics.

Key Features:

• Five-Level Classification System: Implements the five-level classification framework that categorizes proteoform identifications by their ambiguity.
• Software-Independent Implementation: Evaluates proteoform identifications from arbitrary search programs provided their outputs include the information required for ambiguity assessment.
• Feedback Mechanism for Developers: Reports when program outputs lack sufficient information for ambiguity assessment to inform developers which data are missing.
• Compatibility with MetaMorpheus: Integrates with MetaMorpheus and supports classification of identifications from outputs that include bottom-up and top-down proteomic identifications.
• Validation of Transparency in Results: Produces classification labels that make the ambiguity of proteoform identifications explicit for downstream analysis.

Scientific Applications:

• Comparative Proteomics: Enables standardized comparison of proteoform identification ambiguity across different experimental setups and software platforms.
• Proteome Diversity Studies: Supports analysis of proteome diversity within samples by clarifying which proteoform identifications are unambiguous versus ambiguous.
• Software Development and Improvement: Guides developers in modifying search program outputs to include the data required for proteoform ambiguity classification.

Methodology:

Evaluates outputs from search programs to determine whether they contain sufficient information for ambiguity assessment and uses a small test file and database to perform this evaluation.