Identification of redox-sensitive cysteines in the arabidopsis proteome using OxiTRAQ, a quantitative redox proteomics method

Pei Liu, Huoming Zhang*, Hai Wang, Yiji Xia*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

78 Citations (Scopus)


Cellular redox status plays a key role in mediating various physiological and developmental processes often through modulating activities of redox-sensitive proteins. Various stresses trigger over-production of reactive oxygen/nitrogen species which lead to oxidative modifications of redox-sensitive proteins. Identification and characterization of redox-sensitive proteins are important steps toward understanding molecular mechanisms of stress responses. Here, we report a high-throughput quantitative proteomic approach termed OxiTRAQ for identifying proteins whose thiols undergo reversible oxidative modifications in Arabidopsis cells subjected to oxidative stress. In this approach, a biotinylated thiol-reactive reagent is used for differential labeling of reduced and oxidized thiols. The biotin-tagged peptides are affinity purified, labeled with iTRAQ reagents, and analyzed using a paralleled HCD-CID fragmentation mode in an LTQ-Orbitrap. With this approach, we identified 195 cysteine-containing peptides from 179 proteins whose thiols underwent oxidative modifications in Arabidopsis cells following the treatment with hydrogen peroxide. A majority of those redox-sensitive proteins, including several transcription factors, were not identified by previous redox proteomics studies. This approach allows identification of the specific redox-regulated cysteine residues, and offers an effective tool for elucidation of redox proteomes.

Original languageEnglish
Pages (from-to)750-762
Number of pages13
Issue number6
Early online date26 Dec 2013
Publication statusPublished - Mar 2014

Scopus Subject Areas

  • Biochemistry
  • Molecular Biology

User-Defined Keywords

  • Arabidopsis thaliana
  • Oxidative stress
  • OxiTRAQ
  • Plant proteomics
  • Redox-sensitive protein
  • Redoxome


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