In-Line Separation by Capillary Electrophoresis Prior to Analysis by Top-Down Mass Spectrometry Enables Sensitive Characterization of Protein Complexes
Open accessAbstract
Intact protein analysis via top-down mass spectrometry (MS) provides a bird’s eye view over the protein complexes and complex protein mixtures with the unique capability of characterizing protein variants, splice isoforms, and combinatorial post-translational modifications (PTMs). Here we applied capillary electrophoresis (CE) through a sheathless CE–electrospray ionization interface coupled to an LTQ Velos Orbitrap Elite mass spectrometer to analyze the Dam1 complex from Saccharomyces cerevisiae. We achieved a 100-fold increase in sensitivity compared to a reversed-phase liquid chromatography coupled MS analysis of recombinant Dam1 complex with a total loading of 2.5 ng (12 amol). N-terminal processing forms of individual subunits of the Dam1 complex were observed as well as their phosphorylation stoichiometry upon Mps1p kinase treatment.
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- Authors
- Han, X., Wang, Y., Aslanian, A., Fonslow, B., Graczyk, B., Davis, T. N., & Yates, J. R.
- Affiliations
- Scripps Research Institute (US)
- University of Washington (US)
- Corresponding author
- Yates, John R.
- Venue
- Journal of Proteome Research
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-11-09
- Volume
- 13
- Issue
- 12
- Pages
- 6078-6086
- ISSN
- 1535-3893 (ISSN-L)
- 1535-3907
- PMC
- PMC4262260
- OpenAlex
- W2323293250
- Cited by
- 72
- References
- 52
- Citations by year
- 2026: 3 · 2025: 5 · 2024: 5 · 2023: 3 · 2022: 10 · 2021: 9 · 2020: 2 · 2019: 12 · 2018: 5 · 2017: 8 · 2016: 8 · 2015: 2
- FWCI
- 2.57
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Journal of Proteome Research (publishedVersion, other-oa)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (8P41GM103533-17, R01 MH067880)
- National Heart, Lung, and Blood Institute (HHSN268201000035C)
- Topics
- Physical Sciences › Chemistry › Spectroscopy › Advanced Proteomics Techniques and Applications
- Physical Sciences › Chemistry › Spectroscopy › Mass Spectrometry Techniques and Applications
- Physical Sciences › Engineering › Biomedical Engineering › Microfluidic and Capillary Electrophoresis Applications
- Keywords
- top-down mass spectrometry, capillary electrophoresis, Dam1 complex, Saccharomyces cerevisiae, protein complexes, top-down proteomics, phosphorylation stoichiometry, Mps1 kinase, N-terminal processing, post-translational modification, protein isoforms, sensitivity enhancement
- MeSH terms
- Binding Sites, Microtubule-Associated Proteins, Molecular Weight, Phosphorylation, Reproducibility of Results, Protein Serine-Threonine Kinases, Cell Cycle Proteins, Electrophoresis, Capillary, Protein Subunits, Spectrometry, Mass, Electrospray Ionization, Saccharomyces cerevisiae Proteins, Proteomics
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