2022
DOI: 10.1111/php.13587
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Interstrand Crosslinking Involving Guanine: A New Major UVC Laser‐Induced Biphotonic Oxidatively Generated DNA Damage

Abstract: Several classes of oxidatively generated DNA damage including oxidized purine and pyrimidine bases, interstrand base crosslinks and DNA‐protein crosslinks have been previously shown to be generated in both isolated DNA and cellular DNA upon exposure to either 266‐nm laser irradiation or one‐electron oxidants. In this study, we provide evidence that biphotonic ionization of guanine bases by UVC laser irradiation of double‐stranded deoxyoligonucleotides in aerated aqueous solutions induces the formation of inter… Show more

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“…117 In addition to crosslinking, a diversity of reactions with guanine radicals exist, among which the most prominent is base release. 127,128 Considering the integrity of terpyridine after electron bombardment, suggested from the UV-Vis absorption spectrum (Fig. 1S †), the resulting G radicals could (1) follow the oxidation and/or reduction processes causing guanine-BDs and (2) abstract hydrogen from the backbones, leading to the cleavage of phosphodiester bonds, i.e., BD + SSB.…”
Section: Radiosensitization Mechanism Of Tpy-pt: Binding To Purines A...mentioning
confidence: 99%
“…117 In addition to crosslinking, a diversity of reactions with guanine radicals exist, among which the most prominent is base release. 127,128 Considering the integrity of terpyridine after electron bombardment, suggested from the UV-Vis absorption spectrum (Fig. 1S †), the resulting G radicals could (1) follow the oxidation and/or reduction processes causing guanine-BDs and (2) abstract hydrogen from the backbones, leading to the cleavage of phosphodiester bonds, i.e., BD + SSB.…”
Section: Radiosensitization Mechanism Of Tpy-pt: Binding To Purines A...mentioning
confidence: 99%