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Synthesis and characterization of VIVO complexes of picolinate and pyrazine derivatives: behavior in the solid state and aqueous solution and biotransformation in the presence of blood plasma proteins

Koleša-Dobravc, Tanja and Lodyga-Chruscinska, Elzbieta and Symonowicz, Marzena and Sanna, Daniele and Meden, Anton and Perdih, Franc and Garribba, Eugenio (2014) Synthesis and characterization of VIVO complexes of picolinate and pyrazine derivatives: behavior in the solid state and aqueous solution and biotransformation in the presence of blood plasma proteins. Inorganic Chemistry, Vol. 53 (15), p. 7960-7976. eISSN 1520-510X. Article.

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DOI: 10.1021/ic500766t

Abstract

Oxidovanadium(IV) complexes with 5-cyanopyridine-2-carboxylic acid (HpicCN), 3,5-difluoropyridine-2-carboxylic acid (HpicFF), 3-hydroxypyridine-2-carboxylic acid (H2hypic), and pyrazine-2-carboxylic acid (Hprz) have been synthesized and characterized in the solid state and aqueous solution through elemental analysis, IR and EPR spectroscopy, potentiometric titrations, and DFT simulations. The crystal structures of the complexes (OC-6-23)-[VO(picCN)2(H2O)]•2H2O (1•2H2O), (OC-6-24)-[VO(picCN)2(H2O)]•4H2O (2•4H2O), (OC-6-24)-Na[VO(Hhypic)3]•H2O (4), and two enantiomers of (OC-6-24)-[VO(prz)2(H2O)] (Λ-5 and Δ-5) have been determined also by X-ray crystallography. 1 presents the first crystallographic evidence for the formation of a OC-6-23 isomer for bis(picolinato) VIVO complexes, whereas 2, 4, and 5 possess the more common OC-6-24 arrangement. The strength order of the ligands is H2hypic ≫ HpicCN > Hprz > HpicFF, and this results in a different behavior at pH 7.40. In organic and aqueous solution the three isomers OC-6-23, OC-6-24, and OC-6-42 are formed, and this is confirmed by DFT simulations. In all the systems with apo-transferrin (VO)2(apo-hTf) is the main species in solution, with the hydrolytic VIVO species becoming more important with lowering the strength of the ligand. In the systems with albumin, (VO)xHSA (x = 5, 6) coexists with VOL2(HSA) and VOL(HSA)(H2O) when L = picCN, prz, with [VO(Hhypic)(hypic)], [VO(hypic)2]2–, and [(VO)4(μ-hypic)4(H2O)4] when H2hypic is studied, and with the hydrolytic VIVO species when HpicFF is examined. Finally, the consequence of the hydrolysis on the binding of VIVO2+ to the blood proteins, the possible uptake of V species by the cells, and the possible relationship with the insulin-enhancing activity are discussed.

Item Type:Article
ID Code:10066
Status:Published
Refereed:Yes
Uncontrolled Keywords:Pyrazine-2-carboxylic acid (Hprz), IR and EPR spectroscopy, X-ray crystallography, Picolinate and Pyrazine Derivatives
Subjects:Area 03 - Scienze chimiche > CHIM/03 Chimica generale e inorganica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di chimica biomolecolare, Sassari
Publisher:American Chemical Society
eISSN:1520-510X
Deposited On:15 Sep 2014 09:27

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