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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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Detection of Protein Ubiquitination Sites by Peptide Enrichment and Mass Spectrometry
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Peptidase substrates via global peptide profiling.

Debarati M Tagore1, Whitney M Nolte, John M Neveu

  • 1Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA.

Nature Chemical Biology
|November 18, 2008
PubMed
Summary
This summary is machine-generated.

Researchers identified a new pathway in proline peptide breakdown by studying mice lacking dipeptidyl peptidase 4 (DPP4). This reveals how DPP4 regulates metabolism and shows the power of global peptide profiling.

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Area of Science:

  • Biochemistry
  • Proteomics
  • Metabolomics

Background:

  • Peptide metabolism is a complex biological process regulated by numerous proteins.
  • Dipeptidyl peptidase 4 (DPP4) is an enzyme involved in peptide degradation.
  • Understanding DPP4's role is crucial for elucidating metabolic pathways.

Purpose of the Study:

  • To identify endogenous substrates of DPP4.
  • To uncover novel pathways in proline peptide catabolism.
  • To demonstrate the utility of global peptide profiling in studying in vivo peptide metabolism.

Main Methods:

  • Utilized mass spectrometry-based global peptide profiling.
  • Analyzed peptide profiles in mice genetically modified to lack functional DPP4.
  • Compared peptide profiles to identify DPP4 substrates and metabolic alterations.

Main Results:

  • Identified previously unknown endogenous substrates of DPP4.
  • Discovered a novel metabolic pathway in proline peptide catabolism.
  • Demonstrated the interplay between aminopeptidase and DPP4 activities in peptide breakdown.

Conclusions:

  • DPP4 plays a significant role in proline peptide metabolism.
  • A novel pathway linking aminopeptidase and DPP4 activities in peptide catabolism was elucidated.
  • Global peptide profiling is a powerful tool for in vivo metabolic studies.