DNA-interaction studies of a copper(II) complex containing ceftobiprole drug using molecular modeling and multispectroscopic methods

The interaction of the [Cu(cef)(phen)Cl-2] complex with calf-thymus DNA (ct-DNA) at physiological pH was investigated by UV-visible spectrophotometry, fluorescence measurement, dynamic viscosity measurements, circular dichroism spectroscopy, and molecular modeling. UV-vis spectra showed 5 nm bathochromic shift of the absorption band at 270nm along with significant hypochromicity for the absorption band of the complex. The binding constant obtained of UV-vis (1 x 10(5) M-1) is more in keeping with intercalators and suggests this binding mode. Moreover, thermodynamic parameters indicated that hydrogen bond and van der Waals interactions play main roles in the binding of [Cu(cef)(phen)Cl-2] to ct-DNA. In addition, [Cu(cef)(phen)Cl-2]-DNA docked model is in approximate correlation with the experimental results. [GRAPHICS] .