A DNA nanomachine powered by light irradiation

ChemBioChem

Volumn 9, Issue 5, 2008, Pages 702-705

  Liang, Xingguo ^b   Nishioka, Hidenori ^b   Takenaka, Nobutaka ^b   Asanuma, Hiroyuki ^a  

^a NAGOYA UNIVERSITY   (Japan)

^b JAPAN SCIENCE AND TECHNOLOGY AGENCY   (Japan)

Author keywords

Azobenzene; DNA; Nanotechlnology; Phostoisomerization; Tweezers

Indexed keywords

AZOBENZENE; DNA; OLIGONUCLEOTIDE; AZO COMPOUND; NANOMATERIAL;

ARTICLE; DNA HYBRIDIZATION; DNA STRAND; ENERGY TRANSFER; LIGHT INTENSITY; LIGHT IRRADIANCE; NANODEVICE; NANOTECHNOLOGY; PRIORITY JOURNAL; ULTRAVIOLET IRRADIATION; CHEMISTRY; LIGHT; METHODOLOGY; MOLECULAR GENETICS; NUCLEOTIDE SEQUENCE; RADIATION EXPOSURE; TIME; ULTRAVIOLET RADIATION;

AZO COMPOUNDS; BASE SEQUENCE; DNA; LIGHT; MOLECULAR SEQUENCE DATA; NANOSTRUCTURES; NANOTECHNOLOGY; TIME FACTORS; ULTRAVIOLET RAYS;

EID: 43149113462     PISSN: 14394227     EISSN: 14397633     Source Type: Journal    
DOI: 10.1002/cbic.200700649     Document Type: Article

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32. The FRET efficiency in the completely open state (without F strand) at 50°C would be ∼0.25 as estimated from the averaged distance between the TET and TAMRA chromophores, reported to be 6 nm in ref. [8a]. Based on this value, the FRET efficiency in the closed state could be evaluated as 0.79.
33. [8a] rather strong fluorescence remained even in the completely closed state at 20°C. In our case, the fluorescence intensity was around 60 AU at 20°C (data not shown). Therefore, we think that the residual fluorescence after closing the tweezers can be attributed mainly to the low FRET efficiency.
34. 12X. We recently synthesized a modified azobenzene which has much more efficient photoresponsiveness: H. Nishioka, X. G. Liang, H. Kashida, H. Asanuma, Chem. Commun. 2007, 4354-4356. With this new modified azobenzene, complete dissociation can be expected.
35. 12X (see Figure S2). When fewer azobenzene residues (four or eight X residues) were used, photoregulation was also attained but with lower efficiency.
36. No clear resonant intramolecular energy transfer from TET to trans- or cis-azobenzene moieties was observed.
37. If the temperature is too high, the duplex dissociates in both cases of trans and cis configuration; if the temperature is too low, the duplex is formed in both cases.