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Copper complex species within a fragment of the N-terminal repeat region in opossum PrP protein (127 visite)

Vagliasindi LI, Arena G, Bonomo RP, Pappalardo G, Tabbì G

Dalton Trans (ISSN: 1477-9226, 1477-9234, 1477-9234electronic), 2011 Mar 21; 40(11): 2441-2450.



Tipo di articolo: Journal Article, Research Support, Non-U. S. Gov'T,

Impact factor: 3.838, Impact factor a 5 anni: 3.887

Url: http://www.scopus.com/inward/record.url?eid=2-s2.0-79952145496&partnerID=40&md5=cac70494405b7c98c2bc0ec611c99f7a

Parole chiave: Aqueous Solutions, Coordination Sphere, Copper Complexes, Epr Spectra, Equatorial Planes, Histidine Residues, Human Prion Protein, Hyperfine Coupling Constants, Low Temperatures, N-Terminals, Neutral Region, Nitrogen Atom, Nitrogen Donors, Oxygen Atom, Peptide Nitrogen, Ph Range, Ph Value, Pseudo-Octahedral Geometries, Redox Potentials, Spectroscopic Data, Voltammetric Studies, Water Molecule, Amino Acids, Chromophores, Coordination Reactions, Electron Spin Resonance Spectroscopy, Redox Reactions, Stereochemistry, Copper Compounds, Animal, Article, Circular Dichroism, Genetics, High Performance Liquid Chromatography, Instrumentation, Methodology, Opossum, Potentiometry, High Pressure Liquid, Spectrum Analysis, High Pressure Liquid Instrumentation Methods, Copper Chemistry, Prions Chemistry Genetics, Spectrum Analysis Methods,

Affiliazioni:

*** IBB - CNR ***
Dipartimento di Scienze Chimiche, Università Degli Studi di Catania, Viale A. Doria 6, 95125, Catania, Italy
Consorzio Interuniversitario C.I.R.C.S.M.B., Via C. Ulpiani 27, 70125, Bari, Italy
Istituto di Biostrutture e Bioimmagini, CNR, U.O.S. di Catania, Viale A. Doria 6, 95125, Catania, Italy



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A spectroscopic (UV-Vis, CD and EPR), thermodynamic and voltammetric study of the copper(II) complexes with the Ac-PHPGGSNWGQ-NH(2) polypeptide (L), a fragment of the opossum PrP protein N-terminal four-repeat region, was carried out in aqueous solution. It suggests the formation of a highly distorted [Cu(L)H(-2)] complex species in the neutral region, the stereochemistry of which is ascribable to a square base pyramid and a CuN(3)O(2) chromophore, resulting from the coordination of a histidine imidazole and two peptide nitrogen atoms and probably oxygen atoms from water molecules. At basic pH values a [Cu(L)H(-3)](-) species with a pseudo-octahedral geometry was also obtained, with four nitrogen donor atoms in its equatorial plane, coming from the histidine residue and from peptidic nitrogen atoms. Interestingly, at pH values relatively higher than the neutrality, the coordination sphere of the copper complex in the [Cu(L)H(-2)] species changes its stereochemistry towards a pseudo-octahedron, as suggested by the change in the parallel copper hyperfine coupling constant of the EPR spectra at low temperature. A slight difference in the redox potentials between this two-faced [Cu(L)H(-2)] complex species seems to confirm this behaviour. Both potentiometric and spectroscopic data were compared with the analogous species obtained with the Ac-PHGGGWGQ-NH(2) peptide, belonging to the octarepeat domain of the human prion protein (hPrP) N-terminal region. The [Cu(L)H(-2)] species formed by the Ac-PHPGGSNWGQ-NH(2) decapeptide, having a slightly lower stability, turned out to be less abundant and to exist within a narrow pH range.
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Mazzaglia A, Micali N, Scolaro LM, Attanasio F, Magrí A, Pappalardo G, Villari V
* Aggregation properties of the peptide fragments derived from the 17-29 region of the human and rat IAPP: A comparative study with two PEG-conjugated variants of the human sequence (176 visite)
J Phys Chem B (ISSN: 1520-6106, 1520-5207, 1520-5207electronic), 2010 Jan 21; 114(2): 705-713.
Impact Factor: 3.603
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Improta R, Santoro F, Barone V, Lami A
* Vibronic model for the quantum dynamical study of the competition between bright and charge-transfer excited states in single-strand polynucleotides: the adenine dimer case (89 visite)
J Phys Chem A (ISSN: 1089-5639, 1520-5215electronic, 1089-5639linking), 2009 Dec 31; 113(52): 15346-15354.
Impact Factor: 2.899
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Puglisi A, Rizzarelli E, Vecchio G, Iacovino R, Benedetti E, Pedone C, Saviano M
* Crystal And Molecular Structure Of Beta-Cyclodextrins Functionalized With The Anti-Inflammatory Drug Etodolac (144 visite)
Biopolymers (ISSN: 0006-3525, 0006-6352, 0006-3525print), 2009 Dec; 91(12): 1227-1235.
Impact Factor: 2.605
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Improta R, Barone V, Lami A, Santoro F
* Quantum dynamics of the ultrafast ππ*/nπ* population transfer in uracil and 5-fluoro-uracil in water and acetonitrile (123 visite)
J Phys Chem B (ISSN: 1520-6106, 1520-5207, 1520-5207electronic), 2009 Oct 29; 113(43): 14491-14503.
Impact Factor: 3.471
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Bonomo RP, Di Natale G, Rizzarelli E, Tabbì G, Vagliasindi LI
* Copper(II) complexes of prion protein PEG11-tetraoctarepeat fragment: spectroscopic and voltammetric studies (94 visite)
Dalton Trans (ISSN: 1477-9226, 1477-7922, 1477-9234), 2009 Apr 14; (14): 2637-2646.
Impact Factor: 2.908
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Ronga L, Palladino P, Ragone R, Benedetti E, Rossi F
* A thermodynamic approach to the conformational preferences of the 180-195 segment derived from the human prion protein α2-helix (100 visite)
J Pept Sci (ISSN: 1075-2617, 1099-1387, 1075-2617print), 2009; 15(1): 30-35.
Impact Factor: 1.807
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Karunakaran V, Kleinermanns K, Improta R, Kovalenko SA
* Photoinduced dynamics of guanosine monophosphate in water from broad-band transient absorption spectroscopy and quantum-chemical calculations (116 visite)
J Am Chem Soc (ISSN: 0002-7863, 0002-2786, 1520-5126), 2009; 131(16): 5839-5850.
Impact Factor: 8.58
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Sgarlata C, Bonaccorso C, Gulino FG, Zito V, Arena G, Sciotto D
* Sterochemistry And Thermodynamics Of The Inclusion Of Aliphatic And Aromatic Anionic Guests In A Tetracationic Calix [4] Arene In Acidic And Neutral Aqueous Solutions (105 visite)
New Journal Of Chemistry, 2009; 33: 991-991.
Impact Factor: 3.159
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Santoro F, Barone V, Improta R
* The Excited States Decay Of The A-T Dna: A Pcm/Td-Dft Study In Aqueous Solution Of The (9-Methyl-Adenine) 2 (1-Methyl-Thymine) 2 Stacked Tetramer (90 visite)
J Am Chem Soc (ISSN: 0002-7863, 0002-2786, 1520-5126), 2009; 131(42): 15232-15245.
Impact Factor: 8.58
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Ronga L, Palladino P, Saviano G, Tancredi T, Benedetti E, Ragone R, Rossi F
* Structural characterization of a neurotoxic threonine-rich peptide corresponding to the human prion protein α2-helical 180-195 segment and comparison with full-length α2-helix-derived peptides (139 visite)
J Pept Sci (ISSN: 1075-2617, 1099-1387, 1075-2617print), 2008; 14(10): 1096-1102.
Impact Factor: 1.654
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Bonomo RP, Pappalardo G, Rizzarelli E, Santoro AM, Tabbì G, Vagliasindi LI
* Nitrogen oxide interaction with copper complexes formed by small peptides belonging to the prion protein octa-repeat region (145 visite)
Dalton Trans (ISSN: 1477-9226, 1477-9234, 1477-9234electronic), 2007 Apr 14; (14): 1400-1408.
Impact Factor: 3.212
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Ronga L, Langella E, Palladino P, Marasco D, Tizzano B, Saviano M, Pedone C, Improta R, Ruvo M
* Does Tetracycline Bind Helix 2 Of Prion? An Integrated Spectroscopical And Computational Study Of The Interaction Between The Antibiotic And Alpha Helix 2 Human Prion Protein Fragments (150 visite)
Proteins (ISSN: 0887-3585, 1097-0134, 1097-0134electronic), 2007 Feb 15; 66(3): 707-715.
Impact Factor: 3.354
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Osz K, Nagy Z, Pappalardo G, Di Natale G, Sanna D, Micera G, Rizzarelli E, Sóvágó I
* Copper(II) interaction with prion peptide fragments encompassing histidine residues within and outside the octarepeat domain: speciation, stability constants and binding details (136 visite)
Chemistry (ISSN: 0947-6539, 1521-3765, 1521-3765electronic), 2007; 13(25): 7129-7143.
Impact Factor: 5.33
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Mazzarella L, Vergara A, Vitagliano L, Merlino A, Bonomi G, Scala S, Verde C, Di Prisco G
* High resolution crystal structure of deoxy hemoglobin from Trematomus bernacchii at different pH values: The role of histidine residues in modulating the strength of the root effect (105 visite)
Proteins (ISSN: 0887-3585, 1097-0134, 1097-0134electronic), 2006 Nov 1; 65(2): 490-498.
Impact Factor: 3.73
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Langella E, Improta R, Crescenzi O, Barone V
* Assessing the acid-base and conformational properties of histidine residues in human prion protein (125-228) by means of pKα calculations and molecular dynamics simulations (179 visite)
Proteins (ISSN: 0887-3585, 1097-0134, 1097-0134electronic), 2006 Jul 1; 64(1): 167-177.
Impact Factor: 3.73
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Tizzano B, Palladino P, De Capua A, Marasco D, Rossi F, Benedetti E, Pedone C, Ragone R, Ruvo M
* The Human Prion Protein Alpha2 Helix: A Thermodynamic Study Of Its Conformational Preferences (112 visite)
Proteins (ISSN: 0887-3585, 1097-0134, 1097-0134electronic), 2005 Apr 1; 59(1): 72-79.
Impact Factor: 4.684
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Di Natale G, Impellizzeri G, Pappalardo G
* Conformational properties of peptide fragments homologous to the 106-114 and 106-126 residues of the human prion protein: a CD and NMR spectroscopic study (123 visite)
Org Biomol Chem (ISSN: 1477-0520, 1477-0539, 1477-0539electronic), 2005 Feb 7; 3(3): 490-497.
Impact Factor: 2.547
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Langella E, Improta R, Barone V
* Checking the pH-induced conformational transition of prion protein by molecular dynamics simulations: Effect of protonation of histidine residues (143 visite)
Biophysical Journal (ISSN: 0006-3495, 1542-0086), 2004 Dec; 87(6): 3623-3632.
Impact Factor: 4.585
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Improta R, Barone V
* Interplay of electronic, environmental, and vibrational effects in determining the hyperfine coupling constants of organic free radicals (104 visite)
Chemical Reviews (ISSN: 0009-2665), 2004 Mar; 104(3): 1231-1253.
Impact Factor: 20.233
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Barone V, Improta R, Rega N
* Computation of protein pK's values by an integrated density functional theory/Polarizable Continuum Model approach (104 visite)
Theor Chem Acc (ISSN: 1432-881x), 2004; 111(2-6): 237-245.
Impact Factor: 2.209
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Campagna T, Grasso G, Rizzarelli E, Vecchio G
L- and D-cysteine derivatives of β-cyclodextrin: Different molecular recognition properties of their copper(II) complexes for amino acids (122 visite)
Inorg Chim Acta (ISSN: 0020-1693), 1998; 275-276: 395-400.
Impact Factor: 1.454
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Marletta F, Rizzarelli E, Mangiameli A, Brogna A, Sammartano S, Monaco S, Blasi A
Effects of graded doses of copper complexes of L-aminoacids on gastric acid secretion in rats (99 visite)
Boll Soc Ital Biol Sper (ISSN: 0037-8771), 1979 Apr 30; 55(8): 769-775.
Impact Factor: 0
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45 Records (44 escludendo Abstract e Conferenze).
Impact factor totale: 186.106 (182.947 escludendo Abstract e Conferenze).
Impact factor a 5 anni totale: 217.927 (215.09 escludendo Abstract e Conferenze).







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Ultimo aggiornamento: Wednesday 20 February 2019, 11:48:26