University of Cagliari
Reactive-Oxygen-Species-Mediated Surface Oxidation of Single-Molecule DNA Origami by an Atomic Force Microscope Tip-Mounted C 60 Photocatalyst
Cristiana Passiu;Antonella Rossi;
2021-01-01
Abstract
Spatially controlled single-molecule oxidation of DNA was performed by photocatalytic generation of singlet oxygen on chemically functionalized AFM tips. A waffle-type DNA origami deposited on a mica surface is site-specifically destroyed by generation of reactive oxygen species at the AFM tip, which was modified with C60-tripod photocatalyst. Upon AFM scanning under photoirradiation, DNA morphology changes, corresponding to oxidative damage were clearly observed at the single-molecule level. The DNA cleavage occurred with strict dependence on photoirradiation and the presence of C60 on the AFM tip.
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