(IscS-IscU)2 Complex Structures Provide Insights into Fe2S2 Biogenesis and Transfer

Authors

  • Dr. Elodie N. Marinoni,

    1. Metalloproteins Unit, Institut de Biologie Structurale J. P. Ebel Commissariat à l'Énergie Atomique, Centre National de la Recherche Scientifique, Université Joseph Fourier, 41 rue Jules Horowitz, 38027 Grenoble (France)
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  • Dr. Jaim S. de Oliveira,

    1. Department of Biochemistry, Virginia Tech, Blacksburg, VA 24061 (USA)
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  • Dr. Yvain Nicolet,

    1. Metalloproteins Unit, Institut de Biologie Structurale J. P. Ebel Commissariat à l'Énergie Atomique, Centre National de la Recherche Scientifique, Université Joseph Fourier, 41 rue Jules Horowitz, 38027 Grenoble (France)
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  • Dr. Estella C. Raulfs,

    1. Department of Biochemistry, Virginia Tech, Blacksburg, VA 24061 (USA)
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  • Dr. Patricia Amara,

    1. Metalloproteins Unit, Institut de Biologie Structurale J. P. Ebel Commissariat à l'Énergie Atomique, Centre National de la Recherche Scientifique, Université Joseph Fourier, 41 rue Jules Horowitz, 38027 Grenoble (France)
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  • Prof. Dr. Dennis R. Dean,

    1. Department of Biochemistry, Virginia Tech, Blacksburg, VA 24061 (USA)
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  • Dr. Juan C. Fontecilla-Camps

    Corresponding author
    1. Metalloproteins Unit, Institut de Biologie Structurale J. P. Ebel Commissariat à l'Énergie Atomique, Centre National de la Recherche Scientifique, Université Joseph Fourier, 41 rue Jules Horowitz, 38027 Grenoble (France)
    • Metalloproteins Unit, Institut de Biologie Structurale J. P. Ebel Commissariat à l'Énergie Atomique, Centre National de la Recherche Scientifique, Université Joseph Fourier, 41 rue Jules Horowitz, 38027 Grenoble (France)
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  • We thank Prof. Florian D. Schubot from Virginia Tech for assistance with preparation of crystal trials and Kyle Cromer for technical assistance. Work at Virginia Tech was supported by National Science Foundation grant MCB-071770 to D.R.D. We thank Dr. Sandrine Ollagnier-de-Choudens for helpful discussions and the CEA and CNRS for institutional support. E.N.M. is the recipient of a doctorate fellowship from the Ecole Doctorale Chimie-Biologie of the Université de Grenoble. Finally, we thank the staff from ESRF beam lines ID23 and ID29 (Grenoble, France) for help with data collection.

Abstract

original image

The center of attention: IscS cysteine desulfurases and IscU scaffolds are involved in biological iron–sulfur cluster assembly. The X-ray structure of an anaerobically produced, mutated (Fe2S2-(IscS-IscUD35A))2 complex reveals a cluster coordinated by three IscU cysteines and the IscS active cysteine (see picture). In air-exposed crystals the cluster is oxidized to an Fe2S–S center; D35 is essential for complex dissociation.

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