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Potentiometric and spectroscopic studies on the ternary complexes of copper(II) with dipeptides and nucleobases

Sóvágó, Imre and Kiss, Attila and Farkas, Etelka and Sanna, Daniele and Marras, Paolo and Micera, Giovanni (1997) Potentiometric and spectroscopic studies on the ternary complexes of copper(II) with dipeptides and nucleobases. Journal of Inorganic Biochemistry, Vol. 65 (2), p. 103-108. ISSN 0162-0134. Article.

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DOI: 10.1016/S0162-0134(96)00094-3

Abstract

Ternary complexes of copper(II) with dipeptides (GlyGly, GlyAsp, and MetVal) and nucleobases (MeC, MeA, MeUH, MeTH, EtGH, uridine, and thymidine) or derivatives of amino acids (Ac-Lys and Ac-Hm) were studied by potentiometric, UV-visible, and EPR spectroscopic methods. It was found that all ligands form stable adducts with the CuAH−1 species of dipeptides, and the ternary complexes formed by the coordination of imidazole nitrogen donor atom are the most favored in the physiological pH range. The formation of a dimeric species Cu2A2H−2B was detected in the case of EtGH supporting that both N1 and N7 nitrogens of purine take part in metal ion coordination. The data of spectroscopic measurements supported the equatorial coordination of nitrogen donors in CuABH−1 ternary complexes.

Item Type:Article
ID Code:1432
Status:Published
Refereed:Yes
Uncontrolled Keywords:Dipeptides, spectroscopic studies, nucleobases, ternary complexes
Subjects:Area 03 - Scienze chimiche > CHIM/03 Chimica generale e inorganica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di chimica biomolecolare, Sassari
Publisher:Elsevier Science
ISSN:0162-0134
Additional Information:Pubblicato online il 29 aprile 1999.
Deposited On:18 Aug 2009 10:05

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