Cross-talk between the octarepeat domain and the fifth binding site of prion protein driven by the interaction of copper(II) with the N-terminus

Giuseppe Di Natale, Ildikó Turi, Giuseppe Pappalardo, I. Sóvágó, Enrico Rizzarelli

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Prion diseases are a group of neurodegenerative diseases based on the conformational conversion of the normal form of the prion protein (PrP(C)) to the disease-related scrapie isoform (PrP(Sc)). Copper(II) coordination to PrP(C) has attracted considerable interest for almost 20 years, mainly due to the possibility that such an interaction would be an important event for the physiological function of PrP(C). In this work, we report the copper(II) coordination features of the peptide fragment Ac(PEG11)3PrP(60-114) [Ac = acetyl] as a model for the whole N-terminus of the PrP(C) metal-binding domain. We studied the complexation properties of the peptide by means of potentiometric, UV/Vis, circular dichroism and electrospray ionisation mass spectrometry techniques. The results revealed that the preferred histidyl binding sites largely depend on the pH and copper(II)/peptide ratio. Formation of macrochelate species occurs up to a 2:1 metal/peptide ratio in the physiological pH range and simultaneously involves the histidyl residues present both inside and outside the octarepeat domain. However, at increased copper(II)/peptide ratios amide-bound species form, especially within the octarepeat domain. On the contrary, at basic pH the amide-bound species predominate at any copper/peptide ratio and are formed preferably with the binding sites of His96 and His111, which is similar to the metal-binding-affinity order observed in our previous studies.

Original languageEnglish
Pages (from-to)4071-4084
Number of pages14
JournalChemistry - A European Journal
Volume21
Issue number10
DOIs
Publication statusPublished - Mar 2 2015

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Binding sites
Peptides
Copper
Binding Sites
Metals
Amides
PrPSc Proteins
Neurodegenerative diseases
Electrospray ionization
Peptide Fragments
Prion Diseases
Electrospray Ionization Mass Spectrometry
Prions
Circular Dichroism
Protein C
Complexation
Neurodegenerative Diseases
Dichroism
Mass spectrometry
Protein Isoforms

Keywords

  • circular dichroism
  • copper
  • human prion protein
  • mass spectrometry
  • peptides

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Cross-talk between the octarepeat domain and the fifth binding site of prion protein driven by the interaction of copper(II) with the N-terminus. / Di Natale, Giuseppe; Turi, Ildikó; Pappalardo, Giuseppe; Sóvágó, I.; Rizzarelli, Enrico.

In: Chemistry - A European Journal, Vol. 21, No. 10, 02.03.2015, p. 4071-4084.

Research output: Contribution to journalArticle

Di Natale, Giuseppe ; Turi, Ildikó ; Pappalardo, Giuseppe ; Sóvágó, I. ; Rizzarelli, Enrico. / Cross-talk between the octarepeat domain and the fifth binding site of prion protein driven by the interaction of copper(II) with the N-terminus. In: Chemistry - A European Journal. 2015 ; Vol. 21, No. 10. pp. 4071-4084.
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