Individual Ion Mass Spectrometry Enhances the Sensitivity and Sequence Coverage of Top-Down Mass Spectrometry
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Charge detection mass spectrometry (CDMS) is mainly utilized to determine the mass of intact molecules. Previous applications of CDMS have determined the mass-to-charge ratio and the charge of large polymers, DNA molecules, and native protein complexes, from which corresponding mass values could be assigned. Recent advances have demonstrated that CDMS using an Orbitrap mass analyzer yields the reliable assignment of integer charge states that enables individual ion mass spectrometry (I 2 MS) and spectral output directly into the mass domain. Here I 2 MS analysis was extended to isotopically resolved fragment ions from intact proteoforms for the first time. With a radically different bias for ion readout, I 2 MS identified low-abundance fragment ions containing many hundreds of residues that were undetectable by standard Orbitrap measurements, leading to a doubling in the sequence coverage of triosephosphate isomerase. Thus MS/MS with the detection of individual ions (MS/I 2 MS) provides a far greater ability to detect high mass fragment ions and exhibits strong complementarity to traditional spectral readout in this, its first application to top-down mass spectrometry.
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Kafader et al. demonstrated increased sensitivity and sequence coverage when employing CDMS of intact protein analysis.
“Additionally, Kafader et. al demonstrated increase sensitivity and sequence coverage when employing CDMS of intact protein analysis [107].”
From Top-down proteomics: challenges, innovations, and applications in basic and clinical research (2020) · cites this paper as [107]
CDMS is one of the most important recent developments for top-down proteomics.
“Arguably, one of the most important recent developments is charge detection mass spectrometry (CDMS) (also referred to as individual ion MS) for top-down proteomics [107–110].”
From Top-down proteomics: challenges, innovations, and applications in basic and clinical research (2020) · cites this paper as [107]
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- [14]Kafader JO STORI Plots Enable Accurate Tracking of Individual Ion Signals. Journal of The American Society for Mass Spectrometry (2019). PMC6852666 31512223
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Top-down proteomics: challenges, innovations, and applications in basic and clinical research
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- Authors
- Kafader, J. O., Durbin, K. R., Melani, R. D., Des Soye, B. J., Schachner, L. F., Senko, M. W., Compton, P. D., & Kelleher, N. L.
- Affiliations
- Northwestern University (US)
- Departments of Chemistry and Molecular Biosciences, the Chemistry of Life Processes Institute, and the Proteomics Center of Excellence, Northwestern University, Evanston, Illinois 60208, United States
- Thermo Fisher Scientific (United States) (US)
- Corresponding author
- Kelleher, Neil L.
- ORCID
- Venue
- Journal of Proteome Research
- Publisher
- American Chemical Society (ACS)
- Published
- 2020-02-07
- Volume
- 19
- Issue
- 3
- Pages
- 1346-1350
- ISSN
- 1535-3893 (ISSN-L)
- 1535-3907
- PMC
- PMC7060802
- OpenAlex
- W3005216464
- Cited by
- 76
- References
- 27
- Citations by year
- 2026: 21 · 2025: 12 · 2024: 10 · 2023: 8 · 2022: 10 · 2021: 11 · 2020: 2 · 2019: 1
- FWCI
- 2.96
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Licence
- Locations
- Journal of Proteome Research (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- Howard Hughes Medical Institute (Gilliam Fellow)
- Thermo Fisher Scientific (Intensifying Innovation Program)
- National Institute of General Medical Sciences (P41 GM108569)
- American Society of Mass Spectrometry (Post-doctoral Career Development Award)
- Topics
- Physical Sciences › Chemistry › Spectroscopy › Mass Spectrometry Techniques and Applications
- Physical Sciences › Chemistry › Spectroscopy › Advanced Proteomics Techniques and Applications
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolomics and Mass Spectrometry Studies
- Keywords
- top-down mass spectrometry, charge detection mass spectrometry, proteoforms, sequencing depth, triosephosphate isomerase, tandem mass spectrometry
- MeSH terms
- Ions, Proteomics, Tandem Mass Spectrometry
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