Structure of frataxin iron cores: an X-ray absorption spectroscopic study.
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Nichol H, Gakh O, O'Neill HA, Pickering IJ, Isaya G, George GN
Structure of frataxin iron cores: an X-ray absorption spectroscopic study.
Biochemistry. 2003 May 27;42(20):5971-6.
- PubMed ID
- 12755598 [ View in PubMed]
- 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 corner-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.