Structure of frataxin iron cores: An X-ray absorption spectroscopic study

Helen Nichol, Oleksandr Gakh, Heather A. O'Neill, Ingrid J. Pickering, Grazia Isaya, Graham N. George

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Abstract

X-ray absorption spectroscopy at the iron K-edge indicates that the iron cores of human and yeast frataxin polymers assembled in vitro are identical to each other and are similar but not identical to ferritin cores. Both frataxin polymers contain ferrihydrite, a biomineral composed of ferric oxide/hydroxide octahedra. The ferrihydrite in frataxin is less ordered than iron cores of horse spleen ferritin, having fewer face-sharing Fe-Fe interactions but similar double comer-sharing interactions. The extended X-ray absorption fine structure (EXAFS) analysis agrees with previous electron microscopy data showing that frataxin cores are composed of very small ferrihydrite crystallites.

Original languageEnglish (US)
Pages (from-to)5971-5976
Number of pages6
JournalBiochemistry
Volume42
Issue number20
DOIs
StatePublished - May 27 2003

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ASJC Scopus subject areas

  • Biochemistry

Cite this

Nichol, H., Gakh, O., O'Neill, H. A., Pickering, I. J., Isaya, G., & George, G. N. (2003). Structure of frataxin iron cores: An X-ray absorption spectroscopic study. Biochemistry, 42(20), 5971-5976. https://doi.org/10.1021/bi027021l