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. 1982 Aug 11;10(15):4715–4730. doi: 10.1093/nar/10.15.4715

Conformational analysis of the adduct cis-[Pt(NH3)2 d(GpG)]+ in aqueous solution. A high field (500-300 MHz) nuclear magnetic resonance investigation.

J H den Hartog, C Altona, J C Chottard, J P Girault, J Y Lallemand, F A de Leeuw, A T Marcelis, J Reedijk
PMCID: PMC321124  PMID: 6890203

Abstract

A 500, 400 and 300 MHz proton NMR study of the reaction product of cis-Pt(NH3)2Cl2 or cis-[Pt(NH3)2 (H2O)2] (NO3)2 with the deoxydinucleotide d(GpG): cis-[Pt(NH3)2 d(GpG)] was carried out. Complete assignment of the proton resonances by decoupling experiments and computer simulation of the high field part of the spectrum yield proton-proton and proton-phosphorus coupling constants of high precision. Analysis of these coupling constants reveal a 100% N (C3'-endo) conformation for the deoxyribose ring at the 5'-terminal part of the chelated d(GpG) moiety. In contrast, the 3'-terminal -pG part of the molecule displays the normal behaviour for deoxyriboses: the sugar ring prefers to adopt an S (C2'-endo) conformation (about 70%). Extrapolating from this model compound, it is suggested that Pt chelation by a -dGpdG- sequence of DNA would require a S to N conformational change of one deoxyribose moiety as the main conformational alteration and lead to a kink in one strand of the double-helical structure of DNA.

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Selected References

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