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Building high-quality assay libraries for targeted analysis of SWATH MS data.

Olga T Schubert1, Ludovic C Gillet2, Ben C Collins2

  • 11] Department of Biology, Institute of Molecular Systems Biology, ETH Zurich, Zurich, Switzerland. [2] PhD Program in Systems Biology, University of Zurich and ETH Zurich, Zurich, Switzerland.

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Summary
This summary is machine-generated.

This study presents a protocol for building high-quality spectral libraries essential for targeted proteomics using SWATH mass spectrometry. These libraries improve peptide identification accuracy and method performance.

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Area of Science:

  • Proteomics
  • Mass Spectrometry
  • Biochemistry

Background:

  • Targeted proteomics methods like selected/multiple reaction monitoring (S/MRM) and SWATH mass spectrometry (MS) depend on spectral reference libraries for accurate peptide identification.
  • The performance of these proteomics techniques is directly linked to the quality and comprehensiveness of the spectral libraries used.

Purpose of the Study:

  • To present a detailed protocol for constructing extensive, high-quality spectral reference libraries tailored for targeted proteomics applications, specifically SWATH MS.
  • To ensure reliable peptide identification and enhance the performance of SWATH MS-based targeted proteomics.

Main Methods:

  • Data acquisition via discovery proteomics.
  • Assertion of peptide-spectrum matches (PSMs) and generation of consensus spectra.
  • Compilation of MS coordinates, including false discovery rate (FDR) control, retention time normalization, and handling of post-translationally modified peptides.

Main Results:

  • A robust protocol for building comprehensive spectral libraries for SWATH MS was established.
  • The protocol details critical steps from data acquisition to the final compilation of MS coordinates.
  • The generated libraries were successfully used with open-source Skyline software for SWATH data extraction.

Conclusions:

  • The developed protocol enables the creation of high-quality spectral libraries crucial for advancing targeted proteomics with SWATH MS.
  • This resource supports more accurate and efficient peptide identification in complex biological samples.
  • The protocol is efficient, taking 2-3 days to complete, making it a valuable tool for researchers in proteomics.