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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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Higher-energy C-trap dissociation for peptide modification analysis.

Jesper V Olsen1, Boris Macek, Oliver Lange

  • 1Department for Proteomics and Signal Transduction, Max Planck Institute for Biochemistry, Am Klopferspitz 18, D-82131 Martinsried, Germany.

Nature Methods
|August 28, 2007
PubMed
Summary

Higher-energy C-trap dissociation (HCD) in mass spectrometry enables efficient peptide sequencing and modification identification. This method, using the LTQ Orbitrap, aids in de novo sequencing for proteomics research.

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Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Peptide sequencing is fundamental to mass spectrometry-based proteomics.
  • Accurate identification of peptide modifications is crucial for understanding biological processes.

Purpose of the Study:

  • To evaluate higher-energy C-trap dissociation (HCD) for peptide fragmentation in the LTQ Orbitrap mass spectrometer.
  • To assess the utility of HCD-generated immonium ions for pinpointing peptide modifications.
  • To investigate the role of an added octopole collision cell in facilitating de novo sequencing.

Main Methods:

  • Utilized a linear ion trap-orbitrap mass spectrometer (LTQ Orbitrap).
  • Employed higher-energy C-trap dissociation (HCD) for tandem mass spectrometry (MS/MS).
  • Incorporated an octopole collision cell for enhanced fragmentation.

Main Results:

  • HCD enables efficient, high-accuracy, full-mass-range MS/MS fragmentation of peptide ions.
  • Immonium ions generated by HCD provide high confidence in identifying modifications like phosphotyrosine.
  • The addition of an octopole collision cell significantly facilitates de novo peptide sequencing.

Conclusions:

  • HCD is a powerful fragmentation technique for peptide sequencing and modification analysis in proteomics.
  • The LTQ Orbitrap coupled with HCD and an octopole collision cell offers an advanced platform for comprehensive peptide analysis.
  • This approach enhances confidence in identifying post-translational modifications and enables efficient de novo sequencing.