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Pout2Prot: An Efficient Tool to Create Protein (Sub)groups from Percolator Output Files.

Kay Schallert1,2, Pieter Verschaffelt3,4, Bart Mesuere3,4

  • 1Bioprocess Engineering, Otto-von-Guericke University Magdeburg, 39104 Magdeburg, Germany.

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|February 10, 2022
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Summary

Metaproteomics research faces protein inference challenges. Pout2Prot addresses this by integrating Percolator output with Prophane, enabling accurate taxonomic and functional assignments in microbial communities.

Keywords:
bioinformaticscomputational proteomicsmetaproteomicsprotein inference

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Area of Science:

  • Microbiology
  • Bioinformatics
  • Computational Biology

Background:

  • Metaproteomics studies microbial communities, presenting complex protein inference challenges due to shared peptides across species and protein isoforms.
  • Existing tools like Prophane aid taxonomic and functional assignment but lack direct compatibility with common post-processing software such as Percolator.

Purpose of the Study:

  • To develop an advanced protein grouping algorithm and associated software (Pout2Prot) that bridges the gap between Percolator output and Prophane.
  • To enhance the analysis of metaproteomic data by enabling robust protein inference and facilitating taxonomic and functional characterization of microbial communities.

Main Methods:

  • Developed Pout2Prot, a tool that processes multiple Percolator Output (.pout) files.
  • Implemented an advanced protein grouping algorithm considering various strategies and employing weighted spectral counts for abundance estimation.
  • Created Pout2Prot as a web application, a standalone command-line tool, and a reusable software library.

Main Results:

  • Pout2Prot successfully generates protein group and subgroup output files (.tsv) compatible with Prophane.
  • The developed algorithm offers flexible grouping strategies and accurate abundance estimation using weighted spectral counts.
  • The tool facilitates improved protein inference and downstream analysis in metaproteomics.

Conclusions:

  • Pout2Prot effectively resolves the incompatibility between Percolator and Prophane, enhancing metaproteomic data analysis.
  • The software provides a valuable resource for researchers studying microbial communities, improving the accuracy of taxonomic and functional profiling.
  • Pout2Prot is open-source and accessible, promoting wider adoption and further development in the field.