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Accurate phosphoproteomics quantification is crucial. Label-free quantification (LFQ) and stable isotope labeling by amino acids in cell culture (SILAC) offer the best accuracy, while tandem mass tags (TMT) provide precision, especially for DNA damage response studies.

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Area of Science:

  • Proteomics
  • Post-translational Modifications
  • Mass Spectrometry

Background:

  • Reproducible quantification in mass spectrometry (MS)-based proteomics is challenging, particularly for post-translational modifications like phosphorylation.
  • Global phosphoproteomics requires robust quantification techniques to accurately measure changes in phosphorylation levels.

Purpose of the Study:

  • To compare the accuracy and precision of commonly used quantification techniques for global phosphoproteomics.
  • To evaluate label-free quantification (LFQ), stable isotope labeling by amino acids in cell culture (SILAC), and tandem mass tags (TMT) using MS2 and MS3 methods.

Main Methods:

  • A mixed species comparison with fixed phosphopeptide ratios was performed.
  • Tandem mass tag (TMT) quantification was assessed using both MS2 and MS3 fragmentation methods.
  • Phosphoproteome changes during DNA damage response were analyzed.
  • An algorithm for determining phosphorylation site stoichiometry using TMT multiplexing was developed.

Main Results:

  • LFQ and SILAC demonstrated the highest accuracy in fixed ratio comparisons.
  • MS2-based TMT exhibited high precision but suffered from ratio compression, impacting accuracy.
  • MS3-based TMT partially rescued ratio compression issues.
  • MS2-based TMT outperformed MS3-based TMT in detecting regulated phosphopeptides during DNA damage response due to higher precision and identification numbers.
  • MS3-based TMT accuracy was beneficial for developing a phosphorylation site stoichiometry algorithm.

Conclusions:

  • The choice of quantification technique depends on the specific research question in phosphoproteomics.
  • LFQ and SILAC are recommended for accurate quantification, while TMT offers advantages in multiplexing and precision for specific applications like DNA damage response.
  • MS3-based TMT shows promise for applications requiring high accuracy, such as stoichiometry determination.