JBIC Journal of Biological Inorganic Chemistry

, Volume 18, Issue 8, pp 883–893 | Cite as

Human anamorsin binds [2Fe–2S] clusters with unique electronic properties

  • Lucia Banci
  • Simone Ciofi-Baffoni
  • Maciej Mikolajczyk
  • Julia Winkelmann
  • Eckhard Bill
  • Maria-Eirini Pandelia
Original Paper

Abstract

The eukaryotic anamorsin protein family, which has recently been proposed to be part of an electron transfer chain functioning in the early steps of cytosolic iron–sulfur (Fe/S) protein biogenesis, is characterized by a largely unstructured domain (CIAPIN1) containing two conserved cysteine-rich motifs (CX8CX2CXC and CX2CX7CX2C) whose Fe/S binding properties and electronic structures are not well defined. Here, we found that (1) each motif in human anamorsin is able to bind independently a [2Fe–2S] cluster through its four cysteine residues, the binding of one cluster mutually excluding the binding of the second, (2) the reduced [2Fe–2S]+ clusters exhibit a unique electronic structure with considerable anisotropy in their coordination environment, different from that observed in reduced, plant-type and vertebrate-type [2Fe–2S] ferredoxin centers, (3) the reduced cluster bound to the CX2CX7CX2C motif reveals an unprecedented valence localization-to-delocalization transition as a function of temperature, and (4) only the [2Fe–2S] cluster bound to the CX8CX2CXC motif is involved in the electron transfer with its physiological protein partner Ndor1. The unique electronic properties of both [2Fe–2S] centers can be interpreted by considering that both cysteine-rich motifs are located in a highly unstructured and flexible protein region, whose local conformational heterogeneity can induce anisotropy in metal coordination. This study contributes to the understanding of the functional role of the CIAPIN1 domain in the anamorsin family, suggesting that only the [2Fe–2S] cluster bound to the CX8CX2CXC motif is indispensable in the electron transfer chain assembling cytosolic Fe/S proteins.

Graphical abstract

Keywords

Iron–sulfur cluster CIAPIN1 domain Ndor1 Electron transfer Mössbauer and EPR spectroscopy 

Notes

Acknowledgments

We thank Angelo Gallo (CERM) for assistance in recording the EPR spectra and Bernd Mienert for recording the Mössbauer spectra. PRIN (2009FAKHZT_001), BIO-NMR (contract no. 261863), MIUR-FIRB PROTEOMICA (RBRN07BMCT), and Ente Cassa di Risparmio are gratefully acknowledged for financial support. This work was also supported by the European Integrated Structural Biology Infrastructure (Instruct), which is part of the European Strategy Forum on Research Infrastructures and is supported by national member subscriptions. Specifically, we thank the Instruct Core Center CERM (Italy).

Supplementary material

775_2013_1033_MOESM1_ESM.pdf (279 kb)
Supplementary material 1 (PDF 278 kb)

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Copyright information

© SBIC 2013

Authors and Affiliations

  • Lucia Banci
    • 1
    • 2
  • Simone Ciofi-Baffoni
    • 1
    • 2
  • Maciej Mikolajczyk
    • 1
  • Julia Winkelmann
    • 1
  • Eckhard Bill
    • 3
  • Maria-Eirini Pandelia
    • 3
    • 4
  1. 1.Magnetic Resonance Center CERMUniversity of FlorenceSesto FiorentinoItaly
  2. 2.Department of ChemistryUniversity of FlorenceSesto FiorentinoItaly
  3. 3.Max Planck Institute for Chemical Energy ConversionMülheimGermany
  4. 4.Department of ChemistryThe Pennsylvania State UniversityUniversity ParkUSA

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