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Monitoring guanine photo-oxidation by enantiomerically resolved Ru(II) dipyridophenazine complexes using inosine-substituted oligonucleotides
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| Title: | Monitoring guanine photo-oxidation by enantiomerically resolved Ru(II) dipyridophenazine complexes using inosine-substituted oligonucleotides | Authors: | Keane, Páraic M.; Poynton, Fergus E.; Hall, James P.; Quinn, Susan J.; et al. | Permanent link: | http://hdl.handle.net/10197/11606 | Date: | 1-Oct-2015 | Online since: | 2020-09-29T15:56:27Z | Abstract: | 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 Λ- and Δ-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 picosecond time-resolved IR spectroscopy. In both cases inosine replacement leads to a diminished yield, but the trends are strikingly different for Λ- and Δ-complexes. | Funding Details: | Irish Research Council Science Foundation Ireland |
Funding Details: | Royal Irish Academy/Royal Society exchange programme UK Biotechnology and Biological Sciences Research Council UK Science and Technology Facilities Council School of Chemistry and Chemical Biology, UCD |
Type of material: | Journal Article | Publisher: | Royal Society of Chemistry | Journal: | Faraday Discussions | Volume: | 185 | Start page: | 455 | End page: | 469 | Copyright (published version): | 2015 The Royal Society of Chemistry | Keywords: | Ruthenium; Organometallic compounds; Guanine; Inosine; Oligonucleotides; Oxidation-reduction; Stereoisomerism; Photochemistry | DOI: | 10.1039/c5fd00085h | Language: | en | Status of Item: | Peer reviewed | ISSN: | 1359-6640 | This item is made available under a Creative Commons License: | https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ |
| Appears in Collections: | Chemistry Research Collection |
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