title: Exciton Absorption and Luminescence in i-Motif DNA
metadata.name: dc.contributor.author
metadata.value: Reveguk, Zakhar V
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Khoroshilov, Evgeny V
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Sharkov, Andrey V
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Pomogaev, Vladimir A
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Buglak, Andrey A
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Tarnovsky, Alexander N
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Kononov, Alexei I
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2019-11-25T10:52:36Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2019-11-25T10:52:36Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2019-11-05
metadata.lang: -
metadata.name: dc.identifier
metadata.value: 10.1038/s41598-019-52242-1
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Reveguk, Z.V., Khoroshilov, E.V., Sharkov, A.V. et al. Exciton Absorption and Luminescence in i-Motif DNA. Sci Rep 9, 15988 (2019)
metadata.lang: en_GB
metadata.name: dc.identifier.issn
metadata.value: 10.1038/s41598-019-52242-1
metadata.lang: -
metadata.name: dc.identifier.issn
metadata.value: 10.1038/s41598-019-52242-1
metadata.lang: -
metadata.name: dc.identifier.issn
metadata.value: 10.1038/s41598-019-52242-1
metadata.lang: -
metadata.name: dc.identifier.issn
metadata.value: 10.1038/s41598-019-52242-1
metadata.lang: -
metadata.name: dc.identifier.issn
metadata.value: 10.1038/s41598-019-52242-1
metadata.lang: -
metadata.name: dc.identifier.issn
metadata.value: 10.1038/s41598-019-52242-1
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/16630
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: We have studied the excited-state dynamics for the i-motif form of cytosine chains (dC)10, using the ultrafast fluorescence up-conversion technique. We have also calculated vertical electronic transition energies and determined the nature of the corresponding excited states in a model tetramer i-motif structure. Quantum chemical calculations of the excitation spectrum of a tetramer i-motif structure predict a significant (0.3 eV) red shift of the lowest-energy transition in the i-motif form relative to its absorption maximum, which agrees with the experimental absorption spectrum. The lowest excitonic state in i-(dC)10 is responsible for a 2 ps red-shifted emission at 370 nm observed in the decay-associated spectra obtained on the femtosecond time-scale. This delocalized (excitonic) excited state is likely a precursor to a long-lived excimer state observed in previous studies. Another fast 310 fs component at 330 nm is assigned to a monomer-like locally excited state. Both emissive states form within less than the available time resolution of the instrument (100 fs). This work contributes to the understanding of excited-state dynamics of DNA within the first few picoseconds, which is the most interesting time range with respect to unraveling the photodamage mechanism, including the formation of the most dangerous DNA lesions such as cyclobutane pyrimidine dimers.
metadata.lang: en_GB
metadata.name: dc.description.sponsorship
metadata.value: RFBR grant 18-33-01233; CDRF Global grant FSCX-18-63875-0; Norwegian Supercomputer Program (Grant No. NN4654K)
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: en
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: Nature Research
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: Scientific Reports;9
metadata.lang: -
metadata.name: dc.title
metadata.value: Exciton Absorption and Luminescence in i-Motif DNA
metadata.lang: en_GB
metadata.name: dc.title.alternative
metadata.value: Экситонное поглощение и люминесценция в i-мотиве ДНК
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: Exciton Absorption and Luminescence in i-Motif DNA.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/16630/1/Exciton%20Absorption%20and%20Luminescence%20in%20i-Motif%20DNA.pdf
resources.format: Adobe PDF
resources.size: 1,64 MB