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European Biophysics Journal

, Volume 35, Issue 4, pp 340–351 | Cite as

Metal binding in amyloid β-peptides shows intra- and inter-peptide coordination modes

  • Francesco Stellato
  • Gianfranco Menestrina
  • Mauro Dalla Serra
  • Cristina Potrich
  • Rossella Tomazzolli
  • Wolfram Meyer-Klaucke
  • Silvia MoranteEmail author
Article

Abstract

X-ray absorption spectroscopy data show different metal binding site structures in β-amyloid peptides according to whether they are complexed with Cu2+ or Zn2+ ions. While the geometry around copper is stably consistent with an intra-peptide binding with three metal-coordinated Histidine residues, the zinc coordination mode depends on specific solution conditions. In particular, different sample preparations are seen to lead to different geometries around the absorber that are compatible with either an intra- or an inter-peptide coordination mode. This result reinforces the hypothesis that assigns different physiological roles to the two metals, with zinc favoring peptide aggregation and, as a consequence, plaque formation.

Keywords

Histidine Residue Imidazole Ring Coordination Shell Protein Data Bank Format Multiple Scattering Contribution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Abbreviations

AD

Alzheimer’s disease

Amyloid β-peptide

AβPP

β-Amyloid precursor protein

XAS

X-ray absorption spectroscopy

EMBL

European Molecular Biology Laboratory

DESY

Deutsches Elektronen Synchrotron

EXAFS

Extended X-ray absorption fine structure

MDB

Metallo-protein Database and Browser

MS

Multiple scattering

XANES

X-ray absorption near edge

DW

Debye–Waller

PDB

Protein Data Bank

FT

Fourier transform

Notes

Acknowledgements

We are very grateful to G.C. Rossi for discussions and a careful reading of the manuscript. We would also like to thank G. La Penna for useful suggestions and discussions. This work was partly supported by INFM, INFN, CNR, ITC and the “European Community-Research Infrastructure Action” under the FP6 “Structuring the European Research Area Programme” contract number RII3/CT/2004/5060008.

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Copyright information

© EBSA 2006

Authors and Affiliations

  • Francesco Stellato
    • 1
  • Gianfranco Menestrina
    • 2
  • Mauro Dalla Serra
    • 2
  • Cristina Potrich
    • 2
  • Rossella Tomazzolli
    • 2
  • Wolfram Meyer-Klaucke
    • 3
  • Silvia Morante
    • 1
    Email author
  1. 1.Dipartimento di FisicaUniversità di Roma “Tor Vergata” INFM and INFNRomaItaly
  2. 2.Consiglio Nazionale delle RicercheIstituto di Biofisica—Sezione di Trento, Via Sommarive 18PovoItaly
  3. 3.European Molecular Biology Laboratory, c/o DESY, Notkestrasse 85HamburgGermany

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