Abstract
Copper-based transition metal complexes which perform single-strand scission of DNA in a site-specific manner have been designed. The complexes Cu(dpg) + and Cu(dpgt)Cl + (H(dpg) and (dpgt) represent bis(2-pyridylmethyl) derivatives of glycylglycine and glycylglycylglycine, respectively, were prepared in this study and its crystal structures were determined. We have found that Cu(dpgt)Cl + and Cu(dpg) + complexes convert supercoiled plasmid DNA into a mixture of nicked and linear forms in the presence of hydrogen peroxide, whereas related Cu(II) complexes, which lack a peptide group, produce complete degradation of DNA under the same experimental conditions.
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