http://www.cnr.it/ontology/cnr/individuo/prodotto/ID169468
Copper(II) Interaction with Unstructured Prion Domain Outside the Octarepeat Region: Speciation, Stability, and Binding Details of Copper(II) Complexes with PrP106-126 Peptides. (Articolo in rivista)
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- Copper(II) Interaction with Unstructured Prion Domain Outside the Octarepeat Region: Speciation, Stability, and Binding Details of Copper(II) Complexes with PrP106-126 Peptides. (Articolo in rivista) (literal)
- Anno
- 2005-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1021/ic050754k (literal)
- Alternative label
Giuseppe Di Natale; Giulia Grasso; Giuseppe Impellizzeri; Diego La Mendola; Giovanni Micera; Nikolett Mihala; Zoltan Nagy; Katalin Osz; Giuseppe Pappalardo; Viktoria Rigò; Enrico Rizzarelli; Daniele Sanna; Imre Sòvàgò (2005)
Copper(II) Interaction with Unstructured Prion Domain Outside the Octarepeat Region: Speciation, Stability, and Binding Details of Copper(II) Complexes with PrP106-126 Peptides.
in Inorganic chemistry; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Giuseppe Di Natale; Giulia Grasso; Giuseppe Impellizzeri; Diego La Mendola; Giovanni Micera; Nikolett Mihala; Zoltan Nagy; Katalin Osz; Giuseppe Pappalardo; Viktoria Rigò; Enrico Rizzarelli; Daniele Sanna; Imre Sòvàgò (literal)
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- Dipartimento di Scienze Chimiche, UniVersita` di Catania, V.le A. Doria 6, 95125 Catania, Italy,
Istituto di Biostrutture e Bioimmagini-Sezione di Catania, CNR, V.le A. Doria 6, 95125 Catania,
Italy, Dipartimento di Chimica, UniVersita` di Sassari, Via Vienna 2, 07100 Sassari, Italy,
Research Group of Peptide Chemistry, Hungarian Academy of Sciences, H-1518 Budapest,
Hungary, Department of Inorganic and Analytical Chemistry, UniVersity of Debrecen,
H-4010 Debrecen, Hungary, and Istituto di Chimica Biomolecolare-Sezione di Sassari, CNR,
TraVersa La Crucca 3, Regione Baldinca, 07040 Li Punti (SS), Italy (literal)
- Titolo
- Copper(II) Interaction with Unstructured Prion Domain Outside the Octarepeat Region: Speciation, Stability, and Binding Details of Copper(II) Complexes with PrP106-126 Peptides. (literal)
- Abstract
- Copper(II) complexes of the neurotoxic peptide fragments of human and chicken prion proteins were studied by
potentiometric, UV-vis, CD, and EPR spectroscopic and ESI-MS methods. The peptides included the terminally
blocked native and scrambled sequences of HuPrP106-126 (HuPrPAc106-126NH2 and ScrHuPrPAc106-126NH2)
and also the nona- and tetrapeptide fragments of both the human and chicken prion proteins (HuPrPAc106-
114NH2, ChPrPAc119-127NH2, HuPrPAc109-112NH2, and ChPrPAc122-125NH2). The histidyl imidazole-N donor
atoms were found to be the major copper(II) binding sites of all peptides; 3N and 4N complexes containing additional
2 and 3 deprotonated amide-N donors, respectively, are the major species in the physiological pH range. The
complex formation processes for nona- and tetrapeptides are very similar, supporting the fact that successive
deprotonation and metal ion coordination of amide functions go toward the N-termini in the form of joined six- and
five-membered chelates. As a consequence, the peptide sequences investigated here, related to the neurotoxic
region of the human PrP106-126 sequence, show a higher metal-binding affinity than the octarepeat fragments.
In the case of the HuPrP peptide sequences, a weak pH-dependent binding of the Met109 residue was also
detected in the 3N-coordinated complexes. (literal)
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