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Peptide Identification Using Tandem Mass Spectrometry01:33

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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.
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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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Deep Proteome Profiling by Isobaric Labeling, Extensive Liquid Chromatography, Mass Spectrometry, and Software-assisted Quantification
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Single Cell Proteomics Using Multiplexed Isobaric Labeling for Mass Spectrometric Analysis.

Ákos Végvári1, Jimmy E Rodriguez2, Roman A Zubarev2

  • 1Division of Chemistry I, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden. akos.vegvari@ki.se.

Methods in Molecular Biology (Clifton, N.J.)
|November 12, 2021
PubMed
Summary
This summary is machine-generated.

Single cell proteomics offers deeper biological insights than bulk analysis. This study details a mass spectrometry workflow for single-cell proteome profiling using TMTpro labeling in drug-treated lung cancer cells.

Keywords:
A549 human cell lineChemical proteomicsClean sample preparationMass spectrometryMethotrexateSingle cell proteomicsTMT-labeling

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Area of Science:

  • Proteomics
  • Cell Biology
  • Analytical Chemistry

Background:

  • Single cell proteomics is an emerging bioanalytical field.
  • It offers greater biological information than bulk cell analysis.
  • Sensitivity limitations necessitate optimized workflows for mass spectrometry-based methods.

Purpose of the Study:

  • To describe a complete experimental design for single cell proteome analysis.
  • To exemplify the workflow using cultured A549 lung adenocarcinoma cells.
  • To demonstrate the application of tandem mass tag (TMTpro™) labeling.

Main Methods:

  • Single cell isolation and proteome analysis.
  • Mass spectrometry-based data acquisition.
  • Tandem mass tag (TMTpro™) labeling strategy.

Main Results:

  • The study outlines a comprehensive workflow for single cell proteomics.
  • The method was applied to A549 lung adenocarcinoma cells.
  • The workflow successfully utilized TMTpro™ labeling for mass spectrometry.

Conclusions:

  • The described experimental design provides a best-practice workflow for single cell proteomics.
  • This approach enables detailed proteome profiling of individual cells.
  • The methodology is applicable to studying cellular responses to anti-cancer drugs like methotrexate.