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Labeling elastase digests with TMT: informational gain by identification of poorly detectable peptides with

Dominic Baeumlisberger1, Tabiwang N Arrey, Benjamin Rietschel

  • 1Cluster of Excellence Macromolecular Complexes, Institute for Pharmaceutical Chemistry, Goethe-University, Frankfurt/Main, Germany. baeumlisberger@pharmchem.uni-frankfurt.de

Proteomics
|October 7, 2010
PubMed

Insights

Tandem Mass Tag (TMT) zero labeling improves protein identification by increasing peptide detectability. This method enhances sequence coverage, especially for challenging membrane and cytosolic proteins, by enabling detection of low-mass and hydrophobic peptides.

Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Matrix-assisted laser desorption/ionization (MALDI) mass spectrometry has limitations in detecting neutral or low-mass peptides.
  • Standard MALDI typically excludes peptides below 700 Da and favors basic/acidic peptides, hindering comprehensive protein analysis.
  • Identifying membrane and cytosolic proteins presents challenges due to their properties.

Purpose of the Study:

  • To evaluate the benefits of using tandem mass tag (TMT) zero labeling for enhanced protein identification.
  • To assess the increase in sequence coverage achieved through TMT zero labeling.
  • To determine if TMT zero labeling improves the detection of challenging peptide types.

Main Methods:

  • Utilized elastase for initial protein digestion.
  • Applied tandem mass tag (TMT) zero labeling to peptides.
  • Analyzed labeled and unlabeled peptides using MALDI mass spectrometry.
  • Compared peptide detection and sequence coverage between labeled and unlabeled samples.

Main Results:

  • TMT zero labeling increased peptide detectability, particularly for peptides with low molecular masses, isoelectric points (pI), or higher hydrophobicity.
  • Derivatization with TMT reagents shifted peptides into the standard mass range for MALDI reflector mode detection.
  • Improved sequence coverage was observed for identified proteins compared to unlabeled samples.

Conclusions:

  • TMT zero labeling is an effective strategy to overcome limitations of standard MALDI-MS for protein identification.
  • This method significantly enhances the ability to identify membrane and cytosolic proteins.
  • TMT zero labeling expands the scope of proteomic analysis by increasing the detection of previously unidentifiable peptides.

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