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Related Experiment Video

Updated: Mar 30, 2026

A Spin-Tip Enrichment Strategy for Simultaneous Analysis of N-Glycopeptides and Phosphopeptides from Human Pancreatic Tissues
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Variable Digestion Strategies for Phosphoproteomics Analysis.

Humberto Gonczarowska-Jorge1,2, Margherita Dell'Aica1, Clarissa Dickhut1

  • 1Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Dortmund, Germany.

Methods in Molecular Biology (Clifton, N.J.)
|November 21, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces subtilisin, a protease that overcomes trypsin limitations in phosphoproteomics. Subtilisin digestion improves access to hidden phosphosites, enhancing cellular pathway analysis.

Keywords:
Phosphopeptide enrich mentPhosphorylationSubtilisinTitanium dioxideTrypsin

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Area of Science:

  • Proteomics
  • Cellular signaling

Background:

  • Mass spectrometry-based phosphoproteomics advances cellular pathway knowledge.
  • Standard bottom-up approaches using trypsin have limitations due to impaired cleavage near phosphorylation sites and suboptimal peptide lengths.
  • Tryptic cleavage site frequency and distribution can hinder confident peptide identification in LC-MS.

Purpose of the Study:

  • To introduce an alternative protease, subtilisin, for improved phosphoproteomics.
  • To overcome limitations associated with trypsin digestion in identifying phosphosites.
  • To increase the coverage of the phosphoproteome by accessing previously inaccessible sites.

Main Methods:

  • Utilized the nonspecific serine protease subtilisin for protein digestion.
  • Employed a single Liquid Chromatography-Mass Spectrometry (LC-MS) experiment.
  • Compared subtilisin digestion with standard tryptic digestion.

Main Results:

  • >1800 phosphopeptides were identified and localized from 125 μg of HeLa digest using subtilisin.
  • Tryptic digestion identified >2100 phosphosites, with less than 20% overlap between the two methods.
  • Subtilisin enabled the identification of numerous phosphorylation sites not accessible by tryptic digestion.

Conclusions:

  • Subtilisin offers a simple, fast, and reproducible method for phosphoproteomics.
  • This approach significantly increases phosphoproteome coverage by accessing 'hidden' proteome areas.
  • Subtilisin is a valuable alternative to trypsin for comprehensive phosphosite analysis.