A Platinum(IV) Complex Oxidizes Guanine to 8-Oxo-Guanine in DNA and RNA

A platinum(IV) complex with a high reduction potential, d,l-1,2-diaminocyclohexyltetrachloroplatinum(IV) (PtIV(dach)Cl4), oxidizes guanine in guanosine-5'-monophosphate (GMP), 2'-deoxyguanosine-5'-monophosphate (dGMP), d(GG), and a double-stranded oligonucleotide to 8-oxo-guanine. To the best of our knowledge, this is the first report that provides unambiguous evidence of DNA oxidation by a PtIV complex. This oxidative damage may differentiate the anticancer activity of PtIV complexes from their PtII analogues.