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Exploiting soft and hard X-ray absorption spectroscopy to characterize metallodrug/protein interactions: the binding of [trans-RuCl4(Im)(dimethylsulfoxide)][ImH] (Im = imidazole) to bovine serum albumin

Ascone, Isabella, Messori, Luigi, Casini, Angela, Gabbiani, Chiara, Balerna, Antonella, Dell'Unto, Francesca and Castellano, Agostina Congiu 2008. Exploiting soft and hard X-ray absorption spectroscopy to characterize metallodrug/protein interactions: the binding of [trans-RuCl4(Im)(dimethylsulfoxide)][ImH] (Im = imidazole) to bovine serum albumin. Inorganic Chemistry 47 (19) , pp. 8629-8634. 10.1021/ic8001477

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Abstract

The reaction of bovine serum albumin (BSA) with [trans-RuCl4(Im)(dimethylsulfoxide)][ImH] (Im = imidazole) (NAMI-A), an experimental ruthenium(III) anticancer drug, and the formation of the respective NAMI-A/BSA adduct were investigated by X-ray absorption spectroscopy (XAS) at the sulfur and chlorine K-edges and at the ruthenium K- and L3-edges. Ruthenium K and L3-edge spectra proved unambiguously that the ruthenium center remains in the oxidation state +3 after protein binding. Comparative analysis of the chlorine K-edge XAS spectra of NAMI-A and NAMI-A/BSA, revealed that the chlorine environment is greatly perturbed upon protein binding. Only modest changes were observed in the sulfur K-edge spectra that are dominated by several protein sulfur groups. Overall, valuable information on the nature of this metallodrug/protein adduct and on the mechanism of its formation was gained; XAS spectroscopy turns out to be a very suitable method for the characterization of this kind of systems.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: American Chemical Society
Last Modified: 04 Jun 2017 08:30
URI: http://orca.cf.ac.uk/id/eprint/79361

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