A re-investigation of copper coordination in the octa-repeats region of the prion protein(327 views visite) Bonomo RP, Cucinotta V, Giuffrida A, Impellizzeri G, Magrì A, Pappalardo G, Rizzarelli E, Santoro AM, Tabbì G, Vagliasindi LI
Dalton T (ISSN: 1477-9226, 1477-9234, 1477-9234electronic), 2005 Jan 7; (1): 150-158.
Dipartimento di Scienze Chimiche, Universítà di Catania, Viale A. Doria 6, 95125, Catania, Italy Ist. di Biostrutture e Bioimmagini, CNR (Sezione di Catania), Viale A. Doria 6, 95125, Catania, Italy
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A re-investigation of copper coordination in the octa-repeats region of the prion protein
An aqueous solution spectroscopic (Vis and EPR) study of the copper(II) complexes with the Ac-HGGG-NH2 and AcPHGGGWGQ-NH2 polypeptides (generically designated as L) suggests square base pyramids ascribable to [Cu(L)H-2] complex species, which contain three nitrogen donor atoms, arising from imidazole and peptide groups, in the equatorial plane and for a pseudo-octahedral geometry in the case of [Cu(L)H-3]- and [Cu(L)H-4]2- which have four nitrogen donor atoms in their equatorial plane. The coordination sphere of the copper complex in the [Cu(L)H-2] species, which is present at neutral pH values, is completed by two oxygen donor atoms. ESI-MS spectra ascertained that water molecules are not present in the coordination equatorial plane of this latter species, in comparison with other copper(II) complexes with ligands bearing nitrogen and oxygen donor atoms and surely having equatorial water molecules. This indicates the coordination of a carbonyl oxygen atom in the equatorial plane has to be invoked. However, no direct proof about the involvement of a carbonyl group oxygen donor atom apically linked to copper was obtained, due to the flexibility of these structures at room temperature. Additionally, the low A1 value leads one to consider another oxygen atom of a carbonyl group being involved in the apical bond to copper in a fast exchange fashion. This apical interaction, which may also involve a water molecule, is more pronounced in the Cu-Ac-HGGG-NH2 than in the analogous Cu-Ac-PHGGGWGQ-NH2 system, probably because of the presence of tryptophan and proline in the polypeptide sequence.
A re-investigation of copper coordination in the octa-repeats region of the prion protein
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