Abstract
Friedreich's ataxia, the most prevalent hereditary ataxia, is caused by a patient's inability to produce a viable form of the protein frataxin. Frataxin plays an essential role in cellular iron regulation and has been shown to participate in the assembly of iron-sulfur (Fe-S) clusters under a variety of roles, including modulating persulfide production and directing Fe(II) delivery to the assembly scaffold protein. While the activity and structure of multiple eukaryotic frataxin orthologs have been characterized, the fly ortholog has numerous advantages over other orthologs with regards to protein stability, its activity towards Fe-S cluster assembly and its stability for forming stable proteins partner assemblies. Given the obvious advantages for studying the Drosophila melanogaster frataxin homolog (Dfh) over its orthologs, we have undertaken a structural characterization of apo-Dfh as the first step towards solving the solution structure of the protein alone and in complex with protein partners within the Fe-S cluster assembly pathway.
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