Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 13, Pages 4334-4338Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201900740
Keywords
circular dichroism; DNA; G-quadruplexes; oligonucleotides; photoregulation
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Funding
- EPSRC [EP/L015366/1, EP/M015378/1, EP/P010253/1, EP/M022609/1]
- University of Bristol
- EPSRC
- Royal Society [UF1402310, RGF\ EA\ 180076]
- Spanish Ministerio de Economia y Competitividad [CTQ2015-64275-P]
- European Research Council [ERC-COG: 648239]
- EPSRC [EP/J010588/1, EP/M015378/1, EP/L000253/1, EP/P010253/1, EP/I030395/1] Funding Source: UKRI
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The polymorphic nature of G-quadruplex (G4) DNA structures points to a range of potential applications in nanodevices and an opportunity to control G4 in biological settings. Light is an attractive means for the regulation of oligonucleotide structure as it can be delivered with high spatiotemporal precision. However, surprisingly little attention has been devoted towards the development of ligands for G4 that allow photoregulation of G4 folding. We report a novel G4-binding chemotype derived from stiff-stilbene. Surprisingly however, whilst the ligand induces high stabilization in the potassium form of human telomeric DNA, it causes the unfolding of the same G4 sequence in sodium buffer. This effect can be reversed on demand by irradiation with 400nm light through deactivation of the ligand by photo-oxidation. By fuelling the system with the photolabile ligand, the conformation of G4 DNA was switched five times.
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