Cited by 14Mass Spectrometry Techniques and ApplicationsAdvanced Proteomics Techniques and ApplicationsUbiquitin and proteasome pathways

Top-Down Analysis of Branched Proteins Using Mass Spectrometry

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Chen, Dapeng, Gomes, Fabio, Abeykoon, Dulith, Lemma, Betsegaw, Wang, Yan, Fushman, David, Fenselau, Catherine·2018·Analytical Chemistry

Abstract

Post-translational modifications by the covalent attachment of Rub1 (NEDD8), ubiquitin, SUMO, and other small signaling proteins have profound impacts on the functions and fates of cellular proteins. Investigations of the relationship of these bioactive structures and their functions are limited by analytical methods that are scarce and tedious. A novel strategy is reported here for the analysis of branched proteins by top-down mass spectrometry and illustrated by application to four recombinant proteins and one synthetic peptide modified by covalent bonds with ubiquitin or Rub1. The approach allows an analyte to be recognized as a branched protein; the participating proteins to be identified; the site of conjugation to be defined; and other chemical, native, and recombinant modifications to be characterized. In addition to the high resolution and high accuracy provided by the mass spectrometer, success is based on sample fragmentation by electron-transfer dissociation assisted by collisional activation and on software designed for graphic interpretation and adapted for branched proteins. The strategy allows for structures of unknown, two-component branched proteins to be elucidated directly the first time and can potentially be extended to more complex systems.

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  1. [9]Bazzaro M Oncotarget, 2015, 6, 4159– 4165. 25784654 PMC4414179

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Authors
Chen, D., Gomes, F., Abeykoon, D., Lemma, B., Wang, Y., Fushman, D., & Fenselau, C.
Affiliations
  • University of Maryland, College Park (US)
  • University of Maryland, College Park, Maryland 20742, United States
Corresponding author
Fenselau, Catherine
Venue
Analytical Chemistry
Published
2018-03-07
Volume
90
Issue
6
Pages
4032-4038
ISSN
  • 0003-2700 (ISSN-L)
  • 1520-6882
OpenAlex
W2790832597
Cited by
14
References
33
Citations by year
2025: 1 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 2 · 2019: 4 · 2018: 2
FWCI
1.08
Type
journal article
Language
en
Open access
Locations
  • Analytical Chemistry (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • NIH Office of the Director (OD019938)
  • National Institute of General Medical Sciences (GM021248, GM065334)
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 › Ubiquitin and proteasome pathways
Keywords
top-down mass spectrometry, post-translational modification, neddylation, ubiquitin conjugation, SUMO, electron transfer dissociation, collisional activation, protein structure elucidation
MeSH terms
NEDD8 Protein, Amino Acid Sequence, Humans, Models, Molecular, Protein Processing, Post-Translational, Proteins, Recombinant Proteins, Saccharomyces cerevisiae, Ubiquitins, Ubiquitin, Saccharomyces cerevisiae Proteins, PTEN Phosphohydrolase, Tandem Mass Spectrometry, Ubiquitination

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