Abstract：
BACKGROUND:Many proteins of the mitochondrial intermembrane space (IMS) contain structural disulfide bonds formed by the mitochondrial disulfide relay. In fungi and animals, the sulfhydryl oxidase Erv1 'generates' disulfide bonds that are passed on to the oxidoreductase Mia40, which oxidizes substrate proteins. A different structural organization of plant Erv1 proteins compared to that of animal and fungal orthologs was proposed to explain its inability to complement the corresponding yeast mutant. RESULTS:Herein, we have revisited the biochemical and functional properties of Arabidopsis thaliana Erv1 by both in vitro reconstituted activity assays and complementation of erv1 and mia40 yeast mutants. These mutants were viable, however, they showed severe defects in the biogenesis of IMS proteins. The plant Erv1 was unable to oxidize yeast Mia40 and rather even blocked its activity. Nevertheless, it was able to mediate the import and folding of mitochondrial proteins. CONCLUSIONS:We observed that plant Erv1, unlike its homologs in fungi and animals, can promote protein import and oxidative protein folding in the IMS independently of the oxidoreductase Mia40. In accordance to the absence of Mia40 in many protists, our study suggests that the mitochondrial disulfide relay evolved in a stepwise reaction from an Erv1-only system to which Mia40 was added in order to improve substrate specificity. Graphical Abstract The mitochondrial disulfide relay evolved in a step-wise manner from an Erv1-only system.
journal_name
BMC Bioljournal_title
BMC biologyauthors
Peleh V,Zannini F,Backes S,Rouhier N,Herrmann JMdoi
10.1186/s12915-017-0445-8subject
Has Abstractpub_date
2017-11-08 00:00:00pages
106issue
1issn
1741-7007pii
10.1186/s12915-017-0445-8journal_volume
15pub_type
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