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Related Experiment Video

Updated: Jan 4, 2026

High-Resolution Complexome Profiling by Cryoslicing BN-MS Analysis
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High-Resolution Complexome Profiling by Cryoslicing BN-MS Analysis

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High-Resolution Complexome Profiling by Cryoslicing BN-MS Analysis.

Catrin Swantje Müller1, Wolfgang Bildl1, Norbert Klugbauer2

  • 1Institute of Physiology, Faculty of Medicine, University of Freiburg, Freiburg, Germany.

Journal of Visualized Experiments : Jove
|November 5, 2019
PubMed
Summary
This summary is machine-generated.

This study presents an optimized method for comprehensive protein complexome profiling using preparative native polyacrylamide gel electrophoresis (BN-PAGE) and mass spectrometry. The new approach enhances sensitivity and resolution for identifying protein interactions and assemblies in biological samples.

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Area of Science:

  • * Biochemistry
  • * Molecular Biology
  • * Proteomics

Background:

  • * Proteins function through interactions, forming dynamic assemblies or stable complexes.
  • * Native polyacrylamide gel electrophoresis coupled with mass spectrometry (BN-MS) assesses protein complexes but has limitations.
  • * Current methods are laborious, offer limited resolution and sensitivity, and are restricted to abundant proteins, leaving many protein complexes uncharacterized.

Purpose of the Study:

  • * To develop an optimized, high-resolution, and sensitive method for comprehensive protein complexome profiling.
  • * To enable the identification of low-abundance proteins and complex assembly patterns.
  • * To provide a basis for investigating protein stoichiometry, assembly, and interaction dynamics.

Main Methods:

  • * Preparative-scale native polyacrylamide gel electrophoresis (BN-PAGE) for protein complex separation.
  • * Sub-millimeter sampling of gel lanes using cryomicrotome slicing.
  • * Mass spectrometric analysis with label-free protein quantification.

Main Results:

  • * Successfully profiled 2,545 proteins from a mouse kidney endosome-enriched membrane fraction.
  • * Identified low-abundance membrane proteins, including intracellular ion channels.
  • * Revealed high-resolution protein assembly patterns and glycosylation isoforms.
  • * Results align with independent biochemical analyses.

Conclusions:

  • * The developed methodology allows for comprehensive and unbiased identification of protein (super)complexes.
  • * Enables detailed analysis of subunit composition, stoichiometry, and assembly dynamics.
  • * Provides a foundation for studying protein interactions across diverse biological systems.