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Related Concept Videos

The Proteasome01:13

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Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
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Related Experiment Video

Updated: Apr 16, 2026

Resin-Assisted Capture Coupled with Isobaric Tandem Mass Tag Labeling for Multiplexed Quantification of Protein Thiol Oxidation
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Multiple proteases to localize oxidation sites.

Liqing Gu1, Renã A S Robinson1

  • 1Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, United States of America.

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Summary
This summary is machine-generated.

Oxidative post-translational modifications (PTMs) create diverse protein forms. This study used multiple proteases to map these complex oxidative PTMs on ubiquitin, revealing previously unidentified modifications.

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Area of Science:

  • Proteomics
  • Biochemistry
  • Cellular Biology

Background:

  • Cellular environments with high reactive oxygen and nitrogen species and low antioxidants lead to protein oxidative post-translational modifications (PTMs).
  • Irreversible oxidative PTMs generate complex distributions of modified protein molecules, termed proteoforms.
  • Understanding oxidative PTMs is crucial for cellular health and disease research.

Purpose of the Study:

  • To map oxidative modification sites on proteins using a model system.
  • To investigate the complexity of oxidative modifications in bottom-up proteomics analyses.
  • To identify previously unidentified oxidative modifications.

Main Methods:

  • Utilized ubiquitin as a model protein system.
  • Employed multiple protease digestions, including trypsin, Lys-C, and Glu-C.
  • Analyzed resulting peptides to map oxidative modification sites.

Main Results:

  • Detected several M+16 Da proteoforms, indicating specific oxidative modifications.
  • Identified previously unknown oxidative modifications on ubiquitin.
  • Demonstrated the utility of multiple protease digestions for comprehensive PTM analysis.

Conclusions:

  • Multiple protease digestions provide deeper insights into the complexity of oxidative modifications.
  • This approach enhances the characterization of oxidative proteoforms.
  • The findings contribute to a better understanding of oxidative stress impacts on proteins.