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. 1990 Jul 11;18(13):3887–3891. doi: 10.1093/nar/18.13.3887

Formation of a DNA monofunctional cis-platinum adduct cross-linking the intercalating drug N-methyl-2,7-diazapyrenium.

J M Malinge 1, M Sip 1, A J Blacker 1, J M Lehn 1, M Leng 1
PMCID: PMC331090  PMID: 2374713

Abstract

Our purpose was to better understand the mutual influence of cis-diamminedichloroplatinum (II) (cis-DDP) and intercalating drugs in their interactions with DNA. The present study deals with the intercalating drug N-methyl-2,7-diazapyrenium (MDAP). Two sets of experiments have been performed. In one set, the reaction between cis-DDP and nucleic acid was carried out in the presence of MDAP. The main adduct is a guanine residue chelated by platinum to a MDAP residue. It has the same spectroscopic properties as the synthesized compound cis-[Pt (NH3)2 (N7-d-guanosine) (N7-MDAP)] , the structure of which has been determined by 1H NMR. This adduct was only formed with double-stranded nucleic acids which reveals the importance of DNA matrix in orienting favorably the reactants. In the second set of experiments, the triamine complex cis-[Pt(NH3)2 (MDAP)CI]++ was reacted with the nucleic acids. At molar ratios drug over nucleotide residue equal or less than 0.10, all the added triamine complexes bind by covalent coordination to double-stranded nucleic acids. With natural DNA, the major adduct is cis-[Pt(NH3)2(d-guanosine) (MDAP)] . Thus the same adduct is formed on one hand in the reaction between DNA, MDAP and cis-DDP and on the other hand in the reaction between the triamine complex and DNA. The triamine complex offers the possibility to study the biological role of the new adduct.

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Selected References

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