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Related Experiment Video

Updated: Oct 30, 2025

Glycopeptide Capture for Cell Surface Proteomics
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Differential Glycosite Profiling-A Versatile Method to Compare Membrane Glycoproteomes.

Malwina Michalak1,2, Martin Simon Kalteis1,2, Aysel Ahadova1,2

  • 1Department of Applied Tumor Biology, Institute of Pathology, Heidelberg University Hospital, Im Neuenheimer Feld 224, 69120 Heidelberg, Germany.

Molecules (Basel, Switzerland)
|July 2, 2021
PubMed
Summary

This study introduces a novel method to analyze membrane glycoproteins and pinpoint changes in their glycan structures and glycosites. This technique aids in understanding glycosylation

Keywords:
colorectal cancerglycopeptideglycoproteinglycoproteomicsglycositeglycosylationmass spectrometry

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Area of Science:

  • Biochemistry
  • Proteomics
  • Glycomics

Background:

  • Protein glycosylation is a crucial post-translational modification regulating diverse cellular functions.
  • Altered glycosylation patterns in membrane proteins are implicated in various disease mechanisms, making the glycome a therapeutic target.
  • Existing methods for comparing membrane glycoproteomes and identifying glycosite-specific alterations are limited.

Purpose of the Study:

  • To develop and validate a new strategy for comparing membrane glycoproteomes.
  • To identify proteins with altered glycan structures and specific glycosites.
  • To provide a versatile tool for studying glycan functions in various biological contexts.

Main Methods:

  • Optimized digestion of membrane proteins followed by lectin-based isolation of glycopeptides.
  • Analytical size exclusion chromatography to detect mass alterations indicative of glycan changes.
  • N-glycosidase treatment coupled with nanoUPLC-mass spectrometry for glycoprotein and glycosite identification.

Main Results:

  • Successfully established a workflow for comparing membrane glycoproteomes using a colon cancer cell line (CX1) treated with a glycosylation modulator.
  • Demonstrated the ability to identify specific glycoproteins with altered glycan structures and pinpoint the affected glycosites.
  • Validated the methodology's applicability beyond cell cultures, including tissue samples and body fluids.

Conclusions:

  • The developed methodology offers a robust approach to compare membrane glycoproteomes and identify glycan alterations at the glycosite level.
  • This technique serves as a valuable tool for investigating the functional roles of glycans in physiological and pathological processes.
  • The adaptability of the method to various sample types enhances its utility in diverse research settings targeting glycan functions.