Monitoring guanine photo-oxidation by enantiomerically resolved Ru(II) dipyridophenazine complexes using inosine-substituted oligonucleotides

Keane, P. M., Poynton, F. E., Hall, J. P. ORCID: https://orcid.org/0000-0003-3716-4378, Clark, I. P., Sazanovich, I. V., Towrie, M., Gunnlaugsson, T., Quinn, S. J., Cardin, C. J. ORCID: https://orcid.org/0000-0002-2556-9995 and Kelly, J. M. (2015) Monitoring guanine photo-oxidation by enantiomerically resolved Ru(II) dipyridophenazine complexes using inosine-substituted oligonucleotides. Faraday Discussions, 185. pp. 455-469. ISSN 1364-5498 doi: 10.1039/c5fd00085h

Abstract/Summary

The intercalating [Ru(TAP)2(dppz)]2+ complex can photo-oxidise guanine in DNA, although in mixed-sequence DNA it can be difficult to understand the precise mechanism due to uncertainties in where and how the complex is bound. Replacement of guanine with the less oxidisable inosine (I) base can be used to understand the mechanism of electron transfer (ET). Here the ET has been compared for both L- and D-enantiomers of [Ru(TAP)2(dppz)]2+ in a set of sequences where guanines in the readily oxidisable GG step in {TCGGCGCCGA}2 have been replaced with I. The ET has been monitored using picosecond and nanosecond transient absorption and ps-time-resolved IR spectroscopy. In both cases inosine replacement leads to a diminished yield, but the trends are strikingly different for L- and D-complexes.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/40947
Identification Number/DOI	10.1039/c5fd00085h
Refereed	Yes
Divisions	Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Publisher	The Royal Society of Chemistry
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