The behavior of a bimetallic water-soluble (Zn(II)/Pt(II)) porphyrazine hexacation as ligand of G-quadruplex (G4) structures adopted by a human telomeric DNA sequence has been examined with different spectroscopic techniques. In K(+) rich solution the hexacationic Zn(II) porphyrazine ligand bearing a peripheral cis-platin-like functionality changes the G-quadruplex conformational equilibrium of the human telomeric sequence 5'-d[AGGG(TTAGGG)(3)]-3' and drives it exclusively toward a very stable parallel G4 form in the complex with 2:1 stoichiometry. An increase of the melting temperature of more than 20 degrees C is observed in this complex compared to the G4 alone. On the contrary ligand binding to G-quadruplex of the same telomeric sequence in Na(+) rich solution neither markedly influences the predominant basket conformation nor confers increased thermal stability to the G4 structure.

Tetra-2,3-pyrazinoporphyrazines with externally appended pyridine rings. 10. A water-soluble bimetallic (ZnII/PtII) porphyrazine hexacation as potential plurimodal agent for cancer therapy: Exploring the behavior as ligand of telomeric DNA G-quadruplex st

Manet I.
Primo
;
Manoli F.;Cellai L.;Masi A.;Monti S.
2011

Abstract

The behavior of a bimetallic water-soluble (Zn(II)/Pt(II)) porphyrazine hexacation as ligand of G-quadruplex (G4) structures adopted by a human telomeric DNA sequence has been examined with different spectroscopic techniques. In K(+) rich solution the hexacationic Zn(II) porphyrazine ligand bearing a peripheral cis-platin-like functionality changes the G-quadruplex conformational equilibrium of the human telomeric sequence 5'-d[AGGG(TTAGGG)(3)]-3' and drives it exclusively toward a very stable parallel G4 form in the complex with 2:1 stoichiometry. An increase of the melting temperature of more than 20 degrees C is observed in this complex compared to the G4 alone. On the contrary ligand binding to G-quadruplex of the same telomeric sequence in Na(+) rich solution neither markedly influences the predominant basket conformation nor confers increased thermal stability to the G4 structure.
2011
Istituto per la Sintesi Organica e la Fotoreattivita' - ISOF
Istituto di Cristallografia - IC
G-quadruplex, porphyrazine
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/161794
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