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Related Experiment Video

Updated: Jun 17, 2026

Evaluation of Protein–Protein Interactions using an On-Membrane Digestion Technique
07:07

Evaluation of Protein–Protein Interactions using an On-Membrane Digestion Technique

Published on: July 19, 2019

Membrane protein analysis using an improved peptic in-solution digestion protocol.

Benjamin Rietschel1, Sandra Bornemann, Tabiwang N Arrey

  • 1Cluster of Excellence Macromolecular Complexes, Institute for Pharmaceutical Chemistry, Goethe-University, Frankfurt am Main, Germany.

Proteomics
|December 18, 2009
PubMed
Summary
This summary is machine-generated.

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This study optimizes pepsin digestion for membrane protein analysis, offering a new method to identify and characterize these challenging proteins, overcoming trypsin limitations.

Area of Science:

  • Proteomics
  • Membrane Protein Analysis
  • Biochemistry

Background:

  • Trypsin's specificity limits membrane protein proteomic analysis.
  • Less-specific proteases offer potential but are underutilized.
  • Pepsin is typically used in acidic conditions and overlooked for membrane proteins.

Purpose of the Study:

  • To optimize a peptic digest protocol for membrane protein analysis.
  • To evaluate pepsin's utility in identifying and characterizing membrane proteins.
  • To establish a reliable method for membrane proteomic studies.

Main Methods:

  • Optimization of an existing peptic digest protocol.
  • Utilized bacteriorhodopsin from purple membranes as a reference protein.
  • Applied mass spectrometry for peptide identification and characterization.

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Glycopeptide Capture for Cell Surface Proteomics
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Glycopeptide Capture for Cell Surface Proteomics

Published on: May 9, 2014

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Last Updated: Jun 17, 2026

Evaluation of Protein–Protein Interactions using an On-Membrane Digestion Technique
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Evaluation of Protein–Protein Interactions using an On-Membrane Digestion Technique

Published on: July 19, 2019

A Mass Spectrometry-Based Proteomics Approach for Global and High-Confidence Protein R-Methylation Analysis
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A Mass Spectrometry-Based Proteomics Approach for Global and High-Confidence Protein R-Methylation Analysis

Published on: April 28, 2022

Glycopeptide Capture for Cell Surface Proteomics
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Glycopeptide Capture for Cell Surface Proteomics

Published on: May 9, 2014

Main Results:

  • Successfully optimized peptic digest protocol for membrane proteins.
  • Demonstrated pepsin's effectiveness in membrane protein identification.
  • Characterized membrane proteins using the optimized protocol.

Conclusions:

  • Optimized pepsin digestion is a viable method for membrane protein analysis.
  • Pepsin offers advantages over trypsin for certain membrane protein studies.
  • This protocol enhances membrane protein identification and characterization capabilities.