Abstract
The binding of the ruthenium-based anticancer drug candidates KP1019, NAMI-A and RAPTA-T towards different double-stranded oligonucleotides was probed by electrospray ionisation mass spectrometry and compared with that of the widely used platinum-based chemotherapeutics cisplatin, carboplatin and oxaliplatin. It was found that the extent of adduct formation decreased in the following order: cisplatin > oxaliplatin > NAMI-A > RAPTA-T > carboplatin > KP1019. In addition to the characterisation of the adducts formed with the DNA models, the binding sites of the metallodrugs on the oligonucleotides were elucidated employing top-down tandem mass spectrometry and were found to be similar for all the metallodrugs studied, irrespective of the sequence of the oligonucleotide. A strong preference for guanine residues was established.
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Acknowledgments
The authors thank Laure Menin for guidance in operating the quadrupole TOF instrument. M.G. thanks the Austrian Science Foundation for financial support (Schrödinger Fellowship J2882-N19).
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Supporting information containing MALDI-MS data for the analysis of the double strands as well as ESI-MS and CID mass spectra for determining metallodrug–oligonucleotide interactions is provided.
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Groessl, M., Tsybin, Y.O., Hartinger, C.G. et al. Ruthenium versus platinum: interactions of anticancer metallodrugs with duplex oligonucleotides characterised by electrospray ionisation mass spectrometry. J Biol Inorg Chem 15, 677–688 (2010). https://doi.org/10.1007/s00775-010-0635-0
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DOI: https://doi.org/10.1007/s00775-010-0635-0