期刊
HELVETICA CHIMICA ACTA
卷 105, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/hlca.202200052
关键词
chalcogen bonds; fluorescence; fluorescent probes; planarization; G-quartets; triple helices; 4-way junctions
资金
- University of Geneva
- Swiss National Centre of Competence in Research (NCCR) Chemical Biology
- NCCR Molecular Systems Engineering
- Swiss NSF [200020 204175, 51NF40-185898, 51NF40-182895]
- Swiss National Science Foundation (SNF) [200020_204175, 51NF40-185898, 51NF40-182895] Funding Source: Swiss National Science Foundation (SNF)
This paper investigates the planarization of fluorescent flippers on DNA architectures through chemical interactions. Compared to fluorescence in water, planarization on DNA architectures results in a red shift and an increase in fluorescence intensity. The planarization occurs on the water-accessible surface, and different DNA structures can be used for the planarization of flippers. These findings have significant implications for expanding the applications of planarizable push-pull flipper probes.
Planarizable push-pull flipper probes have been introduced to image order and tension of membranes in living cells. In this report, we show that fluorescent flippers can also be planarized by chemical interactions on DNA architectures rather than by physical forces in biomembranes. Compared to fluorescence in water, the planarization on parallel cMyc G-quartets is characterized by a 100 nm red shift of the excitation maximum and a strong increase in fluorescence intensity. A coinciding 100 nm red shift of the emission maximum compared to planarized flippers in ordered membranes reveals that planarization occurs on the water-accessible surface rather than within the G-quartets. Less relevant for physical compression in the ground state in hydrophobic membranes, this functional relevance of flipper solvatochromism in the excited state, reflected by red shifts in emission rather than excitation, is unprecedented and introduces attractive dual sensing perspectives. With decreasing efficiency, flippers are also planarized by antiparallel hTel22 G-quartets, 4-way junctions and triple helices, while the aromatic surface of B-DNA duplexes is too small for strong enough pi stacking. These remarkably consistent results expand the understanding of planarizable push-pull flipper probes and enable applications in new directions.
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