PAPER: Single molecule atomic force microscopy studies of photosensitized singlet oxygen behavior on a DNA origami template

Helmig, S.; Rotaru, A.; Arian, D.; Kovbasyuk, L.; Arnbjerg, J.; Ogilby, P. R.; Kjems, J.; Mokhir, A.; Besenbacher, F.; Gothelf, K. V.

ACS Nano 2010, 4, 7475–7480, doi: doi: 10.1021/nn102701f

Center for DNA Nanotechnology at the Interdisciplinary Nanoscience Center, Aarhus University, DK-8000 Aarhus C, Denmark.

Abstract

DNA origami, the folding of a long single-stranded DNA sequence (scaffold strand) by hundreds of short synthetic oligonucleotides (staple strands) into parallel aligned helices, is a highly efficient method to form advanced self-assembled DNA-architectures. Since molecules and various materials can be conjugated to each of the short staple strands, the origami method offers a unique possibility of arranging molecules and materials in well-defined positions on a structured surface. Here we combine the action of light with AFM and DNA nanostructures to study the production of singlet oxygen from a single photosensitizer molecule conjugated to a selected DNA origami staple strand on an origami structure. We demonstrate a distance-dependent oxidation of organic moieties incorporated in specific positions on DNA origami by singlet oxygen produced from a single photosensitizer located at the center of each origami.

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