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N-terminal iron-mediated self-cleavage of human frataxin: regulation of iron binding and complex formation with target proteins

  • Taejin Yoon
  • Eric Dizin
  • J. A. CowanEmail author
Original Paper

Abstract

Frataxin is an iron-binding mitochondrial matrix protein that has been shown to mediate iron delivery during iron–sulfur cluster and heme biosynthesis. Mitochondrial processing peptidase (MPP) yields a form of human frataxin corresponding to residues 56–210. However, structural and functional studies have focused on a core structure that results from an ill-defined cleavage event at the N-terminus. Herein we show that the N-terminus of MPP-processed frataxin shows a unique high-affinity iron site and that this iron center appears to mediate a self-cleavage reaction. Moreover, the N-terminus appears to block previously defined iron-binding sites located on the carboxylate-rich surface defined by the helix (α1) and the β-sheet (β1), most likely through electrostatic contact with the carboxylate-rich surface on the core protein, as well as inhibiting iron-promoted binding of the iron–sulfur cluster assembly scaffold partner protein, ISU. The physiological significance of iron-mediated release of the N-terminal residues from this anionic surface is discussed.

Keywords

Frataxin Friedreich’s ataxia Self-cleavage Iron binding ISU 

Notes

Acknowledgements

This work was supported by a grant the National Science Foundation, CHE-0111161.

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Copyright information

© SBIC 2007

Authors and Affiliations

  1. 1.Evans Laboratory of ChemistryOhio State UniversityColumbusUSA

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