Crystal structure of human frataxin

Dhe Paganon Sirano, Ron Shigeta, Young In Chi, Michael Ristow, Steven E. Shoelson

Research output: Contribution to journalArticlepeer-review

173 Scopus citations


Friedreich's ataxia, an autosomal recessive neurodegenerative disorder characterized by progressive gait and limb ataxia, cardiomyopathy, and diabetes mellitus, is caused by decreased frataxin production or function. The structure of human frataxin, which we have determined at 1.8-Å resolution, reveals a novel protein fold. A five-stranded, antiparallel β sheet provides a flat platform, which supports a pair of parallel α helices, to form a compact αβ sandwich. A cluster of 12 acidic residues from the first helix and the first strand of the large sheet form a contiguous anionic surface on the protein. The overall protein structure and the anionic patch are conserved in eukaryotes, including animals, plants, and yeast, and in prokaryotes. Additional conserved residues create an extended 1008-Å2 patch on a distinct surface of the protein. Side chains of disease-associated mutations either contribute to the anionic patch, help create the second conserved surface, or point toward frataxin's hydrophobic core. These structural findings predict potential modes of protein-protein and protein-iron binding.

Original languageEnglish (US)
Pages (from-to)30753-30756
Number of pages4
JournalJournal of Biological Chemistry
Issue number40
StatePublished - Oct 6 2000
Externally publishedYes


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