Journal
PLOS ONE
Volume 6, Issue 1, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0016199
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Funding
- French National Agency for Research [ANR-05-MRAR-013-01]
- EC under the European Research Council (ERC) [206634/ISCATAXIA, 242193/EFACTS]
- French Ministry for Research
- American Friedreich Ataxia Research Alliance
- Association Francaise pour l'Ataxie de Friedreich
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Background: Frataxin, the mitochondrial protein deficient in Friedreich ataxia, a rare autosomal recessive neurodegenerative disorder, is thought to be involved in multiple iron-dependent mitochondrial pathways. In particular, frataxin plays an important role in the formation of iron-sulfur (Fe-S) clusters biogenesis. Methodology/Principal Findings: We present data providing new insights into the interactions of mammalian frataxin with the Fe-S assembly complex by combining in vitro and in vivo approaches. Through immunoprecipitation experiments, we show that the main endogenous interactors of a recombinant mature human frataxin are ISCU, NFS1 and ISD11, the components of the core Fe-S assembly complex. Furthemore, using a heterologous expression system, we demonstrate that mammalian frataxin interacts with the preformed core complex, rather than with the individual components. The quaternary complex can be isolated in a stable form and has a molecular mass of approximate to 190 kDa. Finally, we demonstrate that the mature human FXN81-210 form of frataxin is the essential functional form in vivo. Conclusions/Significance: Our results suggest that the interaction of frataxin with the core ISCU/NFS1/ISD11 complex most likely defines the essential function of frataxin. Our results provide new elements important for further understanding the early steps of de novo Fe-S cluster biosynthesis.
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