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Related Concept Videos

Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...

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Analyzing Dynamic Protein Complexes Assembled On and Released From Biolayer Interferometry Biosensor Using Mass Spectrometry and Electron Microscopy
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Approaching the complexity of elastase-digested membrane proteomes using off-gel IEF/nLC-MALDI-MS/MS.

Tabiwang N Arrey1, Benjamin Rietschel, Dimitrios G Papasotiriou

  • 1Cluster of Excellence, Macromolecular Complexes, Institute of Pharmaceutical Chemistry, Goethe-University, Max-von-Laue-Str. 9, D-60438 Frankfurt am Main, Germany.

Analytical Chemistry
|February 9, 2010
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Summary

Off-gel isoelectric focusing (OGE) is an effective glycerol-free prefractionation method for analyzing membrane proteins. This technique minimizes peptide carryover, improving proteomic analysis of complex samples.

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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

Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Liquid chromatography-tandem mass spectrometry (LC-MS/MS) is standard for protein identification.
  • Analyzing complex biological samples, like whole proteomes, presents challenges due to sample complexity and wide protein concentration ranges.
  • Prefractionation or orthogonal separation techniques can enhance proteomic analysis.

Purpose of the Study:

  • To evaluate a complete glycerol-free off-gel isoelectric focusing (OGE) method for membrane peptide prefractionation.
  • To assess the effectiveness of OGE with the enzyme elastase for analyzing purple membranes and Corynebacterium glutamicum membranes.
  • To determine peptide carryover and fraction purity in multidimensional separation experiments.

Main Methods:

  • Developed and applied a glycerol-free off-gel isoelectric focusing (OGE) technique.
  • Utilized the enzyme elastase for nontryptic peptide generation from membrane samples.
  • Performed prefractionation of peptides prior to liquid chromatography separation.
  • Analyzed fractions using tandem mass spectrometry for peptide identification.

Main Results:

  • Achieved effective prefractionation of membrane peptides using glycerol-free OGE.
  • Identified over 85% of unique peptides in a single fraction, indicating minimal carryover.
  • Demonstrated that OGE is suitable for nontryptic membrane peptides, similar to tryptic peptides.
  • Successfully analyzed purple membranes and Corynebacterium glutamicum membranes.

Conclusions:

  • Glycerol-free OGE is a viable and effective prefractionation strategy for membrane proteomics.
  • This method significantly reduces peptide carryover, enhancing the depth and accuracy of proteomic analysis.
  • OGE serves as a powerful tool for multidimensional separation of nontryptic membrane peptides.