Studies of nitric oxide interaction with mono- and dinuclear copper(II) complexes of prion protein bis-octarepeat fragments(369 views) Bonomo RP, Pappalardo G, Rizzarelli E, Tabbì G, Vagliasindi LI
Keywords: Copper, Copper Compounds, Flow Interactions, Nitric Oxide, Copper (ii) Complexes, Dinuclear, Dinuclear Copper, Prion Protein (prp), Copper Oxides, Divalent Cation, Ligand, Organometallic Compound, Water, Article, Chemical Structure, Chemistry, Electrochemistry, Electron Spin Resonance, Solution And Solubility, Ultraviolet Spectrophotometry, Electron Spin Resonance Spectroscopy, Hydrogen-Ion Concentration, Molecular Structure, Copper Chemistry, Nitric Oxide Chemistry, Organometallic Compounds Chemistry, Prions Chemistry, Solutions Chemistry, Water Chemistry,
Affiliations: *** IBB - CNR ***
Dipartimento di Scienze Chimiche, Universita di Catania, Viale A. Doria 6, 95125, Catania, Italy. rbonomo@unict.it
Istituto di Biostrutture e Bioimmagini, CNR, Sezione di Catania, Viale A. Doria 6, 95125, Catania, Italy
References: Not available.
Studies of nitric oxide interaction with mono- and dinuclear copper(II) complexes of prion protein bis-octarepeat fragments
The interaction of nitric oxide with copper(ii) complexes of two octarepeat sequences belonging to the prion protein was studied, considering both mononuclear and dinuclear systems, i.e. Cu-Ac-(PHGGGWGQ)(2)-NH(2) and Cu(2)-Ac-(PHGGGWGQ)(2)-NH(2), respectively. The NO interaction with both systems was followed in aqueous solutions at physiological pH value, by using UV-Vis and EPR spectroscopic techniques as well as cyclic voltammetry. The mechanism of NO interaction with the mononuclear copper complex can be considered similar to that previously observed for the analogous copper systems with Ac-HGGG-NH(2) and Ac-PHGGGWGQ-NH(2). A more complicated behaviour was found with the copper dinuclear system, in which the involvement of two different intermediate complex species was evidenced. A positive cooperativity between the two copper ions, in the reduction process was inferred. When working with a large excess of the Ac-(PHGGGWGQ)(2)-NH(2) ligand, the frozen-solution EPR parameters pertain to the well characterized [Cu(N(im))(4)](2+) unit, which did not exhibit any interaction with NO. The presence of a free coordination site is the necessary requirement for the NO interaction to occur, as found only in the square-pyramidal geometry of [Cu(L)H(-2)] or [Cu(2)(L)H(-4)] complex species, which form when copper and ligand concentrations are similar.
Studies of nitric oxide interaction with mono- and dinuclear copper(II) complexes of prion protein bis-octarepeat fragments
No results.
Studies of nitric oxide interaction with mono- and dinuclear copper(II) complexes of prion protein bis-octarepeat fragments
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