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Potentiometric and spectroscopic studies on the copper(II) and nickel(II) complexes of tripeptides of methionine

Várnagy, Katalin and Bóka, Beáta and Sóvágó, Imre and Sanna, Daniele and Marras, Paolo and Micera, Giovanni (1998) Potentiometric and spectroscopic studies on the copper(II) and nickel(II) complexes of tripeptides of methionine. Inorganica Chimica Acta, Vol. 275-276 , p. 440-446. ISSN 0020-1693. Article.

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DOI: 10.1016/S0020-1693(98)00079-6

Abstract

Copper(II) and nickel(II) complexes of tripeptides containing methionine (MetGlyGly, GlyMetGly, GlyGlyMet, MetMetAla, MetGlyMet and MetMetMet) were studied by potentiometric. UV-Vis and EPR spectroscopic methods. It was found that donor atoms of the peptide backbone (amino and amide nitrogens and carbonyl or carboxylate oxygens) are the primary binding sites in all cases, but the thiother groups of methionyl residues also make some contribution to metal binding. In the case of copper(II) it was concluded that coordination of sulfur atoms depends on the number and location of methionyl residues in the molecule and S(thioether) → Cu(II) charge transfer bands were detected in the species [CuL]+, [CuLH−1] and [CuLH−2]− of peptides containing N-terminal methionine, internal methionine and C-terminal methionine, respectively, Nickel(II) forms stable square-planar, diamagnetic complexes with all tripeptides with the stoichiometry of [NiLH−2] and metal ion coordination of the thioether residue was concluded only in the octahedral [NiL]+ species of peptides containing N-terminal methionine.

Item Type:Article
ID Code:1473
Status:Published
Refereed:Yes
Uncontrolled Keywords:Copper(II), nickel(II), methionine, tripeptide complexes, spectroscopy, electrochemistry
Subjects:Area 03 - Scienze chimiche > CHIM/03 Chimica generale e inorganica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Elsevier
ISSN:0020-1693
Additional Information:Pubblicato online il 5 marzo 1999.
Deposited On:18 Aug 2009 10:05

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