Copper redox chemistry of plant frataxins

Manu Sánchez, Òscar Palacios, Celeste Buchensky, Laura Sabio, Diego Fabian Gomez-Casati, Maria Ayelen Pagani, Mercè Capdevila, Silvia Atrian, Jose M. Dominguez-Vera

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

© 2017 Elsevier Inc. The presence of a conserved cysteine residue in the C-terminal amino acid sequences of plant frataxins differentiates these frataxins from those of other kingdoms and may be key in frataxin assembly and function. We report a full study on the ability of Arabidopsis (AtFH) and Zea mays (ZmFH-1 and ZmFH-2) frataxins to assemble into disulfide-bridged dimers by copper-driven oxidation and to revert to monomers by chemical reduction. We monitored the redox assembly-disassembly process by electrospray ionization mass spectrometry, electrophoresis, UV–Vis spectroscopy, and fluorescence measurements. We conclude that plant frataxins AtFH, ZmFH-1 and ZmFH-2 are oxidized by Cu2 + and exhibit redox cysteine monomer – cystine dimer interexchange. Interestingly, the tendency to interconvert is not the same for each protein. Through yeast phenotypic rescue experiments, we show that plant frataxins are important for plant survival under conditions of excess copper, indicating that these proteins might be involved in copper metabolism.
Original languageEnglish
Pages (from-to)135-140
JournalJournal of Inorganic Biochemistry
Volume180
DOIs
Publication statusPublished - 1 Mar 2018

Keywords

  • Copper chemistry of frataxin
  • Plant frataxins
  • Protein assembly

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