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Related Experiment Video

Updated: Aug 14, 2025

Detection of Protein Ubiquitination Sites by Peptide Enrichment and Mass Spectrometry
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Efficient Enrichment Method for N-Phosphorylation Peptides in Mouse Brain Tissue.

Hui Pan1,2, Baofu Ma1,2, He Wang1,2

  • 1CAS Key Laboratory of Separation Science for Analytical Chemistry, National Chromatographic R & A Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

Journal of the American Society for Mass Spectrometry
|January 13, 2023
PubMed
Summary

Researchers developed a new method to identify protein N-phosphorylation in mouse brain tissue. This technique successfully identified numerous N-phosphorylation sites, offering insights into Alzheimer's disease mechanisms.

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Area of Science:

  • Biochemistry
  • Proteomics
  • Neuroscience

Background:

  • Protein N-phosphorylation is crucial in biological processes, similar to O-phosphorylation.
  • Enriching N-phosphorylation peptides in tissues is challenging due to complexity.

Purpose of the Study:

  • To establish a workflow for identifying N-phosphorylation peptides in mouse brain tissue.
  • To analyze N-phosphorylation changes in an Alzheimer's disease model.

Main Methods:

  • Direct enrichment of N-phosphorylation peptides using high-concentration urea.
  • Utilizing a 0.5 M urea buffer for peptide enrichment.
  • Analysis of mouse brain tissue and hippocampus from an Alzheimer's disease model.

Main Results:

  • Identified 989 N-phosphorylation sites in mouse brain tissue with high reliability (80% localization probability > 0.75).
  • Identified 533 N-phosphorylation sites in 5 × FAD mouse hippocampus.
  • Sequence motif and gene ontology analyses aligned with previous findings.

Conclusions:

  • The developed method is reliable and effective for N-phosphorylation analysis in complex tissues.
  • N-phosphorylation may play a role in Alzheimer's disease, particularly in brain development and cellular responses.
  • Specific biological processes like microtubule organization and reactive oxygen species response are notably altered in the Alzheimer's model.