Journal article

[1H,15N] N.M.R. Kinetic studies of reactions of cis- and trans-[PtCl2(15NH3)(c-C6H 1115NH2)] with guanosine 5′-monophosphate

SJ Barton, KJ Barnham, U Frey, A Habtemariam, RE Sue, PJ Sadler

Australian Journal of Chemistry | Published : 1999


cis-[PtCl2(15NH3)(c-C6H 11NH2)] is an active metabolite of the oral platinum(iv) anticancer drug cis, trans,cis-[PtCl2(CH3CO2)2(NH 3)(c-C6H11NH2)]. Since it is likely that guanine bases on DNA are targets for this drug, we have analysed the kinetics of reaction of this platinum(n) metabolite with guanosine 5′-monophosphate (5′-GMP) at 310 K, pH 7, using [1H,15N] n.m.r. methods. Reactions of the trans isomer are reported for comparison. The reactions proceed via aquated intermediates, and, for the cis isomer, the rates of aquation and substitution of H2O by 5′-GMP are 2-5 times faster trans to the amine ligand (c-C6H11NH2) compared to trans to NH3 for both the first and second steps. For the ..

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