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Analyzing Large Protein Complexes by Structural Mass Spectrometry
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Exploring ECD on a Benchtop Q Exactive Orbitrap Mass Spectrometer.

Kyle L Fort1,2, Christian N Cramer1,3,4, Valery G Voinov5,6

  • 1Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute of Pharmaceutical Sciences, Utrecht University , Utrecht 3584 CH, The Netherlands.

Journal of Proteome Research
|December 19, 2017
PubMed
Summary

Researchers enhanced the Q Exactive Orbitrap mass spectrometer with electron capture dissociation (ECD) for advanced proteomics. This modification improves protein analysis, disulfide bond mapping, and overall data interpretation in mass spectrometry.

Keywords:
OrbitrapQ Exactivebottom-updisulfideelectron capture dissociationmass spectrometrymiddle-downpost-translational modificationsproteintop-down

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Proteomics

Background:

  • Mass spectrometry applications are expanding, necessitating advanced instrumentation with diverse fragmentation techniques.
  • Conventional methods like CID and HCD are common, but less conventional methods (ECD, ETD, EThcD, UVPD) offer increased analytical information.
  • These advanced methods are crucial for complex analyses such as middle-down and top-down proteomics, glycoproteomics, and disulfide bond mapping.

Purpose of the Study:

  • To modify the Q Exactive Orbitrap mass spectrometer to incorporate Electron Capture Dissociation (ECD) capabilities.
  • To evaluate the performance and utility of the modified instrument for various proteomic applications.

Main Methods:

  • Modification of a commercial Q Exactive Orbitrap mass spectrometer to enable ECD fragmentation.
  • Analysis of intact proteins and peptides using the modified instrument.
  • Assessment of fragment ion intensity, sequence coverage, and disulfide bond mapping efficiency.

Main Results:

  • The ECD modification enabled ≥85% of matched ion intensity to originate from ECD fragment ions.
  • High sequence coverage (≥60%) of intact proteins was achieved with high fragment identification rates (∼70% of ion signals matched).
  • The ECD implementation facilitated selective disulfide bond dissociation, enabling identification of disulfide-linked peptide conjugates.

Conclusions:

  • The modified Q Exactive Orbitrap with ECD extends the instrument's capabilities beyond conventional fragmentation methods.
  • This enhancement supports a wider range of applications, including advanced proteomics and structural analysis.
  • The study demonstrates a practical approach to expanding mass spectrometry instrumentation for complex analytical challenges.