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Title: Photocontrolled DNA Binding of a Receptor-Targeted Organometallic Ruthenium(II) Complex
Author: Barragán, Flavia
López-Senín, Paula
Salassa, Luca
Betanzos-Lara, Soledad
Habtemariam, Abraha
Moreno Martínez, Virtudes
Sadler, Peter
Marchán Sancho, Vicente
Keywords: Quimioteràpia del càncer
Receptors cel·lulars
Cancer chemotherapy
Cell receptors
Issue Date: 2011
Publisher: American Chemical Society
Abstract: A photoactivated ruthenium(II) arene complex has been conjugated to two receptor-binding peptides, a dicarba analogue of octreotide and the Arg-Gly-Asp (RGD) tripeptide. These peptides can act as"tumor-targeting devices" since their receptors are overexpressed on the membranes of tumor cells. Both ruthenium-peptide conjugates are stable in aqueous solution in the dark, but upon irradiation with visible light, the pyridyl-derivatized peptides were selectively photodissociated from the ruthenium complex, as inferred by UV-vis and NMR spectroscopy. Importantly, the reactive aqua species generated from the conjugates, [(η6-p-cym)Ru(bpm)(H2O)]2+, reacted with the model DNA nucleobase 9-ethylguanine as well as with guanines of two DNA sequences, 5′dCATGGCT and 5′dAGCCATG. Interestingly, when irradiation was performed in the presence of the oligonucleotides, a new ruthenium adduct involving both guanines was formed as a consequence of the photodriven loss of p-cymene from the two monofunctional adducts. The release of the arene ligand and the formation of a ruthenated product with a multidentate binding mode might have important implications for the biological activity of such photoactivated ruthenium(II) arene complexes. Finally, photoreactions with the peptide-oligonucleotide hybrid, Phac-His-Gly-Met-linker-p5′dCATGGCT, also led to arene release and to guanine adducts, including a GG chelate. The lack of interaction with the peptide fragment confirms the preference of such organometallic ruthenium(II) complexes for guanine over other potential biological ligands, such as histidine or methionine amino acids.
Note: Versió postprint del document publicat a:
It is part of: Journal of the American Chemical Society, 2011, vol. 133, num. 35, p. 14098-14108
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ISSN: 0002-7863
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)

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