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. 1995 Jul 11;23(13):2381–2388. doi: 10.1093/nar/23.13.2381

Intrastrand cross-links are not formed in the reaction between transplatin and native DNA: relation with the clinical inefficiency of transplatin.

M Boudvillain 1, R Dalbiès 1, C Aussourd 1, M Leng 1
PMCID: PMC307041  PMID: 7630715

Abstract

The reaction between trans-diamminedichloroplatinum(II) and single-stranded oligonucleotides containing the sequence d(GXG) (X being an adenine, cytosine or thymine residue) yields trans-[Pt(NH3)2[(GXG)-GN7,GN7]] intrastrand cross-links. These cross-links do not prevent the pairing of the platinated oligonucleotides with their complementary strands but they decrease the thermal stability of the duplexes. The thermal stability is not much affected by the chemical nature of the X residue and its complementary base. By gel electrophoresis, it is shown that the trans- [Pt(NH3)2[d(GTG)-GN7,GN7]] cross-link bends the DNA double helix (26 degrees) and unwinds it (45 degrees). The pairing of the platinated oligonucleotides with their complementary strands promotes the rearrangement of the 1,3-intrastrand cross-links into interstrand cross-links. At a given temperature, the nature of the X residue, its complementary base and of the base pairs adjacent to the adducts do not dramatically affect the rate of the reaction. To know whether trans-[Pt(NH3)2[d(GXG)-GN7,GN7]] cross-links do not rearrange in some sequences, the location of these adducts was searched in double-stranded DNA after reaction with trans-diamminedichloroplatinum(II) by means of the 3'-5' exonuclease activity of T4 DNA polymerase. At low level of platination, trans-[Pt(NH3)2[d(GXG)-GN7,GN7]] cross-links were not detected. Monofunctional adducts and interstrand cross-links were mainly formed. These results are discussed in relation with the clinical inefficiency of trans-diamminedichloroplatinum(II).

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Selected References

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