Cited by 49Advanced Proteomics Techniques and ApplicationsMass Spectrometry Techniques and ApplicationsMetabolomics and Mass Spectrometry Studies

A Top-Down Proteomics Platform Coupling Serial Size Exclusion Chromatography and Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

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Tucholski, Trisha, Knott, Samantha J., Chen, Bifan, Pistono, Paige, Lin, Ziqing, Ge, Ying·2019·Analytical Chemistry

Abstract

Mass spectrometry (MS) based top-down proteomics provides rich information about proteoforms arising from combinatorial amino acid sequence variations and post-translational modifications (PTMs). Fourier transform ion cyclotron resonance (FT-ICR) MS affords ultrahigh resolving power and provides high-accuracy mass measurements, presenting a powerful tool for top-down MS characterization of proteoforms. However, the detection and characterization of large proteins from complex mixtures remain challenging due to the exponential decrease in S: N with increasing molecular weight (MW) and coeluting low-MW proteins; thus, size-based fractionation of complex protein mixtures prior to MS analysis is necessary. Here, we directly combine MS-compatible serial size exclusion chromatography (sSEC) fractionation with 12 T FT-ICR MS for targeted top-down characterization of proteins from complex mixtures extracted from human and swine heart tissue. Benefiting from the ultrahigh resolving power of FT-ICR, we isotopically resolved 31 distinct proteoforms (30-50 kDa) simultaneously in a single mass spectrum within a 100 m/ z window. Notably, within a 5 m/ z window, we obtained baseline isotopic resolution for 6 distinct large proteoforms (30-50 kDa). The ultrahigh resolving power of FT-ICR MS combined with sSEC fractionation enabled targeted top-down analysis of large proteoforms (>30 kDa) from the human heart proteome without extensive chromatographic separation or protein purification. Further separation of proteoforms inside the mass spectrometer (in-MS) allowed for isolation of individual proteoforms and targeted electron capture dissociation (ECD), yielding high sequence coverage. sSEC/FT-ICR ECD facilitated the identification and sequence characterization of important metabolic enzymes. This platform, which facilitates deep interrogation of proteoform primary structure, is highly tunable, allows for adjustment of MS and MS/MS parameters in real time, and can be utilized for a variety of complex protein mixtures.

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Authors
Tucholski, T., Knott, S. J., Chen, B., Pistono, P., Lin, Z., & Ge, Y.
Affiliations
University of Wisconsin–Madison (US)
Corresponding author
Ge, Ying
Venue
Analytical Chemistry
Published
2019-02-13
Volume
91
Issue
6
Pages
3835-3844
ISSN
  • 0003-2700 (ISSN-L)
  • 1520-6882
OpenAlex
W2914139080
Cited by
49
References
60
Citations by year
2026: 3 · 2025: 6 · 2024: 7 · 2023: 9 · 2022: 5 · 2021: 4 · 2020: 9 · 2019: 5 · 2018: 1
FWCI
2.29
Type
journal article
Language
en
Open access
Locations
  • Analytical Chemistry (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute of General Medical Sciences (R01 GM117058, R01 GM125085)
  • NIH Office of the Director (S10 OD018475)
  • National Heart, Lung, and Blood Institute (R01 HL096971, R01 HL109810)
  • Division of Human Resource Development (HRD-1612530)
  • Division of Graduate Education (DGE-1747503)
Topics
  • Physical Sciences › Chemistry › Spectroscopy › Advanced Proteomics Techniques and Applications
  • Physical Sciences › Chemistry › Spectroscopy › Mass Spectrometry Techniques and Applications
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolomics and Mass Spectrometry Studies
Keywords
top-down proteomics, FT-ICR mass spectrometry, proteoforms, isotopic resolution, electron capture dissociation, post-translational modification
MeSH terms
Chromatography, Gel, Fourier Analysis, Humans, Myocardium, Mass Spectrometry, Cyclotrons, Proteomics

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