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Detection of Protein Ubiquitination Sites by Peptide Enrichment and Mass Spectrometry
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An unbiased proteomic platform for ATE1-based arginylation profiling.

Zongtao Lin1, Yixuan Xie2, Joanna Gongora2

  • 1Department of Biochemistry and Molecular Biophysics, Washington University in St. Louis, St. Louis, MO, USA. zongtao@wustl.edu.

Nature Chemical Biology
|August 25, 2025
PubMed
Summary
This summary is machine-generated.

We developed a new method to discover protein arginylation sites, a challenging post-translational modification. This platform identifies true arginylation, overcoming limitations of previous techniques for broader biological insights.

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Area of Science:

  • Biochemistry
  • Proteomics
  • Molecular Biology

Background:

  • Protein arginylation is a crucial post-translational modification catalyzed by arginyl-tRNA-protein transferase 1 (ATE1) in mammals.
  • Differentiating arginylation from translational arginine residues is difficult due to identical mass.

Purpose of the Study:

  • To present a general arginylation profiling platform for unbiased discovery of arginylation substrates and modification sites.
  • To enable precise identification of bona fide arginylation, overcoming existing technical challenges.

Main Methods:

  • An ATE1-based assay utilizing isotopic arginine labeling in biological lysates (ex vivo).
  • Integration of labeling with an assay to eliminate ribosomal bias and identify true arginylation.
  • Application to diverse sample types including peptides, proteins, cells, patient, and mouse samples.

Main Results:

  • Successfully identified 235 unique arginylation sites in human proteomes from 20 µg of input.
  • Demonstrated the platform's applicability across various biological sample types.
  • Validated representative arginylation sites and initiated follow-up studies on their biological functions.

Conclusions:

  • The developed platform offers a robust method for global arginylation profiling.
  • This approach facilitates the functional characterization of protein arginylation, a previously difficult-to-study modification.
  • The platform opens new avenues for understanding the biological roles of arginylation.