A platinum–quinacridine hybrid as a G-quadruplex ligand
- 19 July 2007
- journal article
- research article
- Published by Springer Nature in JBIC Journal of Biological Inorganic Chemistry
- Vol. 12 (7) , 1003-1014
- https://doi.org/10.1007/s00775-007-0273-3
Abstract
A novel platinum–quinacridine hybrid, comprising a monofunctional Pt moiety and a G-quadruplex ligand (mono-para-quinacridine or MPQ), has been synthesized and shown to interact with quadruplex DNA via a dual noncovalent/covalent binding mode. Denaturing gel electrophoresis was used to separate the various platination products of 22AG (an oligonucleotide that mimics the human telomeric repeat) by Pt-MPQ, and it was shown that two platinated adducts are highly stable quadruplex structures. Dimethylsulfate/piperidine treatment and 3′-exonuclease digestion of the isolated adducts allowed us to precisely determine the platination pattern of 22AG by Pt-MPQ, which displays three main sites G2, G10 and G22. Data presented herein support the hypothesis that Pt-MPQ traps preferentially the antiparallel structure of the 22AG quadruplex. Finally, the kinetics of Pt-MPQ platination using a construct containing both quadruplex DNA and a duplex DNA parts provide the first insights into the Pt-MPQ preference for quadruplex DNA over duplex DNA.Keywords
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