Copper(II) complexes of rat amylin fragments (483 views)
Dalton T (ISSN: 1477-9234, 1477-9226, 1477-9234electronic), 2011 Oct 14; 40(38): 9711-9721.
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Paper type: Journal Article, Research Support, Non-U. S. Gov'T,
Impact factor: 3.838, 5-year impact factor: 3.887
Url: http://www.scopus.com/inward/record.url?eid=2-s2.0-80055052483&partnerID=40&md5=6502e04695cbf9a21629624428f400db
Keywords: Alkaline Conditions, Anchoring Groups, Coordinating Donors, Coordination Modes, Copper (ii), Copper Complexes, Copper Ions, Data Support, Density Functional Theory Calculations, Deprotonated Amides, Metal Binding, Metal Binding Ligands, Ph Range, Physiological Condition, Physiological Ph Range, Polar Side Chains, Side-Chains, Specific Sequences, Spectral Parameters, Spectroscopic Method, Tetra Peptide, Alkalinity, Amino Acids, Electron Spin Resonance Spectroscopy, Spectroscopic Analysis, Stoichiometry, Copper Compounds, Amylin, Organometallic Compound, Amino Acid Sequence, Animal, Article, Chemical Structure, Chemistry, Human, Molecular Genetics, Quantum Theory, Synthesis, Islet Amyloid Polypeptide, Molecular Sequence Data, Molecular Structure,
Affiliations:
*** IBB - CNR ***
Department of Inorganic and Analytical Chemistry, University of Debrecen, Hungary. kallay.csilla@science.unideb.hu
CNR Institute of Biomolecular Chemistry, Traversa La Crucca 3, 07040, Baldinca-Li Punti (Sassari), Italy
Department of Chemistry, Center for Biotechnology Development and Biodiversity Research, University of Sassari, Via Vienna 2, 07100, Sassari, Italy
Department of Pharmaceutical Sciences, University of Connecticut, Unit 3092, 69 North Eagleville Rd, Storrs, CT 06269, United States
References:
Not available.
Dalton T (ISSN: 1477-9234, 1477-9226, 1477-9234electronic), 2011 Oct 14; 40(38): 9711-9721.
Export to BibTeX Export to EndNote
Paper type: Journal Article, Research Support, Non-U. S. Gov'T,
Impact factor: 3.838, 5-year impact factor: 3.887
Url: http://www.scopus.com/inward/record.url?eid=2-s2.0-80055052483&partnerID=40&md5=6502e04695cbf9a21629624428f400db
Keywords: Alkaline Conditions, Anchoring Groups, Coordinating Donors, Coordination Modes, Copper (ii), Copper Complexes, Copper Ions, Data Support, Density Functional Theory Calculations, Deprotonated Amides, Metal Binding, Metal Binding Ligands, Ph Range, Physiological Condition, Physiological Ph Range, Polar Side Chains, Side-Chains, Specific Sequences, Spectral Parameters, Spectroscopic Method, Tetra Peptide, Alkalinity, Amino Acids, Electron Spin Resonance Spectroscopy, Spectroscopic Analysis, Stoichiometry, Copper Compounds, Amylin, Organometallic Compound, Amino Acid Sequence, Animal, Article, Chemical Structure, Chemistry, Human, Molecular Genetics, Quantum Theory, Synthesis, Islet Amyloid Polypeptide, Molecular Sequence Data, Molecular Structure,
Affiliations:
*** IBB - CNR ***
Department of Inorganic and Analytical Chemistry, University of Debrecen, Hungary. kallay.csilla@science.unideb.hu
CNR Institute of Biomolecular Chemistry, Traversa La Crucca 3, 07040, Baldinca-Li Punti (Sassari), Italy
Department of Chemistry, Center for Biotechnology Development and Biodiversity Research, University of Sassari, Via Vienna 2, 07100, Sassari, Italy
Department of Pharmaceutical Sciences, University of Connecticut, Unit 3092, 69 North Eagleville Rd, Storrs, CT 06269, United States
References:
Not available.
Copper(II) complexes of rat amylin fragments
The fragments of rat amylin rIAPP(17-29) (Ac-VRSSNNLGPVLPP-NH(2)), rIAPP(17-22) (Ac-VRSSNN-NH(2)), rIAPP(19-22) (Ac-SSNN-NH(2)) and rIAPP(17-20) (Ac-VRSS-NH(2)) together with the related mutant peptides (Ac-VASS-NH(2) and Ac-VRAA-NH(2)) have been synthesized and their copper(II) complexes studied by potentiometric, UV-Vis, CD and EPR spectroscopic methods. Despite the lack of any common strongly coordinating donor functions some of these fragments are able to bind copper(II) ions in the physiological pH range. The longest fragment rat amylin(17-29) keeps one equivalent copper(II) ion in solution in the whole pH range, while two other peptides Ac-VRSSNN-NH(2) and Ac-SSNN-NH(2) are also able to interact with copper(II) ions in the slightly alkaline pH range. According to the spectral parameters of the complexes, the peptides can be classified into two different categories: (i) the tetrapeptides Ac-VRSS-NH(2), Ac-VASS-NH(2) and Ac-VRAA-NH(2) can interact with copper(II) only under strongly alkaline conditions (pH > 10.0) and the formation of only one species with four amide nitrogen coordination can be detected; (ii) the peptides Ac-VRSSNNLGPVLPP-NH(2), Ac-VRSSNN-NH(2) and Ac-SSNN-NH(2) can form complexes above pH 6.0 with the major stoichiometries [CuH(-2)L], [CuH(-3)L](-) and [CuH(-4)L](2-). These data support that rIAPP(17-29) can interact with copper(II) ions under physiological conditions and the SSNN tetrapeptide fragment can be considered as the shortest sequence responsible for metal binding. Density functional theory (DFT) calculations provide some information on the possible coordination modes of Ac-SSNN-NH(2) towards the copper(II) ion and suggest that for [CuH(-2)L], [CuH(-3)L](-) and [CuH(-4)L](2-), the binding of two, three and four deprotonated amide nitrogens, with NH(-) of the side chain of asparagine as anchoring group, is probable. Moreover, these data reveal that peptides can be effective metal binding ligands even in the absence of anchoring groups, if more polar side chains are present in a specific sequence.
The fragments of rat amylin rIAPP(17-29) (Ac-VRSSNNLGPVLPP-NH(2)), rIAPP(17-22) (Ac-VRSSNN-NH(2)), rIAPP(19-22) (Ac-SSNN-NH(2)) and rIAPP(17-20) (Ac-VRSS-NH(2)) together with the related mutant peptides (Ac-VASS-NH(2) and Ac-VRAA-NH(2)) have been synthesized and their copper(II) complexes studied by potentiometric, UV-Vis, CD and EPR spectroscopic methods. Despite the lack of any common strongly coordinating donor functions some of these fragments are able to bind copper(II) ions in the physiological pH range. The longest fragment rat amylin(17-29) keeps one equivalent copper(II) ion in solution in the whole pH range, while two other peptides Ac-VRSSNN-NH(2) and Ac-SSNN-NH(2) are also able to interact with copper(II) ions in the slightly alkaline pH range. According to the spectral parameters of the complexes, the peptides can be classified into two different categories: (i) the tetrapeptides Ac-VRSS-NH(2), Ac-VASS-NH(2) and Ac-VRAA-NH(2) can interact with copper(II) only under strongly alkaline conditions (pH > 10.0) and the formation of only one species with four amide nitrogen coordination can be detected; (ii) the peptides Ac-VRSSNNLGPVLPP-NH(2), Ac-VRSSNN-NH(2) and Ac-SSNN-NH(2) can form complexes above pH 6.0 with the major stoichiometries [CuH(-2)L], [CuH(-3)L](-) and [CuH(-4)L](2-). These data support that rIAPP(17-29) can interact with copper(II) ions under physiological conditions and the SSNN tetrapeptide fragment can be considered as the shortest sequence responsible for metal binding. Density functional theory (DFT) calculations provide some information on the possible coordination modes of Ac-SSNN-NH(2) towards the copper(II) ion and suggest that for [CuH(-2)L], [CuH(-3)L](-) and [CuH(-4)L](2-), the binding of two, three and four deprotonated amide nitrogens, with NH(-) of the side chain of asparagine as anchoring group, is probable. Moreover, these data reveal that peptides can be effective metal binding ligands even in the absence of anchoring groups, if more polar side chains are present in a specific sequence.
Copper(II) complexes of rat amylin fragments
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Copper(II) complexes of rat amylin fragments
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Bellia F, La Mendola D, Maccarrone G, Mineo P, Vitalini D, Scamporrino E, Sortino S, Vecchio G, Rizzarelli E
* Copper(II) Complexes With Beta-Cyclodextrin-Homocarnosine Conjugates And Their Antioxidant Activity (384 views)
Inorg Chim Acta (ISSN: 0020-1693), 2007 Feb 15; 360(3): 945-954.
Impact Factor: 1.713
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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 (751 views)
Chemistry (ISSN: 0947-6539, 1521-3765, 1521-3765electronic), 2007; 13(25): 7129-7143.
Impact Factor: 5.33
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La Mendola D, Bonomo RP, Impellizzeri G, Maccarrone G, Pappalardo G, Pietropaolo A, Rizzarelli E, Zito V
* Copper(II) complexes with chicken prion repeats: Influence of proline and tyrosine residues on the coordination features (428 views)
J Biol Inorg Chem (ISSN: 0949-8257, 1432-1327electronic, 0949-8257print), 2005 Sep; 10(5): 463-475.
Impact Factor: 3.224
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Cucinotta V, Giuffrida A, La Mendola D, Maccarrone G, Puglisi A, Rizzarelli E, Vecchio G
* 3-Amino Derivative Of Beta-Cyclodextrin: Thermodynamics Of Copper (ii) Complexes And Exploitation Of Its Enantioselectivity In The Separation Of Amino Acid Racemates By Ligand Exchange Capillary Electrophoresis (415 views)
And Life Sciencesjournal Of Chromatography B Analytical Technologies In The Biomedical, 2004 Feb 5; 800(1-2): 127-133.
Impact Factor: 1.403
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Mineo P, Vitalini D, La Mendola D, Rizzarelli E, Scamporrino E, Vecchio G
* Coordination Features Of Difunctionalized Beta-Cyclodextrins With Carnosine: Esi-Ms And Spectroscopic Investigations On 6a, 6d-Di-(beta-Alanyl-L-Histidine)-6a, 6d-Dideoxy-Beta-Cyclodextrin And 6a, 6c-Di-(beta-Alanyl-L-Histidine)-6a, 6c-Dideoxy-Beta-Cyclodextrin And Their Copper (ii) Complexes (661 views)
J Chem Res (ISSN: 1873-3344, 0162-0134, 0162-0134print), 2004 Feb; 98(2): 254-265.
Impact Factor: 2.225
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Tabbì G, Nauser T, Koppenol WH, Reedijk J
A Pulse Radiolysis Study of an Imidazolato-Bridged Asymmetric Dicopper(II) Complex: A Structural and Functional Mimic of Superoxide Dismutase (332 views)
Eur J Inorg Chem (ISSN: 1434-1948, 1099-0682e), 1998; (12): 1939-1943.
Impact Factor: 2.222
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Bonomo RP, Cucinotta V, D'Alessandro F, Impellizzeri G, Maccarrone G, Rizzarelli E, Vecchio G, Carima L, Corradini R, Sartor G, Marchelli R
Chiral recognition by the copper(ii) complex of 6-deoxy-6-n-(2 - methylaminopyridine)-β-cyclodextrin (588 views)
Chirality (ISSN: 0899-0042), 1997; 9(4): 341-349.
Impact Factor: 1.915
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25 Records (25 excluding Abstracts).
Total impact factor: 84.283 (84.283 excluding Abstracts).
Total 5 year impact factor: 86.961 (86.961 excluding Abstracts).
Total impact factor: 84.283 (84.283 excluding Abstracts).
Total 5 year impact factor: 86.961 (86.961 excluding Abstracts).
483 views. Last view on Monday 07 October 2024, 5:55:30
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