Base Pairing Enhances Fluorescence and Favors Cyclobutane Dimer Formation Induced upon Absorption of UVA Radiation by DNA
Open accessAbstract
The photochemical properties of the DNA duplex (dA)(20)·(dT)(20) are compared with those of the parent single strands. It is shown that base pairing increases the probability of absorbing UVA photons, probably due to the formation of charge-transfer states. UVA excitation induces fluorescence peaking at ∼420 nm and decaying on the nanosecond time scale. The fluorescence quantum yield, the fluorescence lifetime, and the quantum yield for cyclobutane dimer formation increase upon base pairing. Such behavior contrasts with that of the UVC-induced processes.
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Absorption of UVA photons by DNA is well documented and is driven by stacking of bases in the double helix.
“It may be added, although being a much lower process than in the UVC and UVB ranges, that absorption of UVA photons by DNA is a well-documented fact (94) that was recently shown to be driven by the stacking of bases in the double helix (95,96).”
From Photoinduced Damage to Cellular DNA: Direct and Photosensitized Reactions<sup>†</sup> (2012) · cites this paper as [95]
Singlet excited states arising from initial UVA photon absorption have a marked charge-transfer character and differ from those induced by UVB.
“The singlet excited states arising from initial UVA photon absorption that are characterized by a marked charge transfer state appear to be quite different from those induced by UVB irradiation (95).”
From Photoinduced Damage to Cellular DNA: Direct and Photosensitized Reactions<sup>†</sup> (2012) · cites this paper as [95]
DNA absorbs only slightly in the lower UVA range up to 340 nm, leading mostly to cis-syn T<>T through delocalization of excited-state transients over several nucleobases.
“As already mentioned, DNA only absorbs slightly in the lower part of the UVA range of solar radiation up to 340 nm, leading mostly to the formation of cis-syn T<>T through delocalization of excited state transients on several nucleobases (95,96).”
From Photoinduced Damage to Cellular DNA: Direct and Photosensitized Reactions<sup>†</sup> (2012) · cites this paper as [95]
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Self-citation
- Authors
- Banyasz, A., Vayá, I., Changenet-Barret, P., Gustavsson, T., Douki, T., & Markovitsi, D.
- Affiliations
- CNRS, IRAMIS, SPAM, Laboratoire Francis Perrin, URA 2453, 91191 Gif-sur-Yvette, France
- Centre National de la Recherche Scientifique (FR)
- Corresponding author
- Markovitsi, Dimitra
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-03-18
- Volume
- 133
- Issue
- 14
- Pages
- 5163-5165
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2037402820
- Cited by
- 106
- References
- 22
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 6 · 2023: 4 · 2022: 1 · 2021: 7 · 2020: 6 · 2019: 5 · 2018: 8 · 2017: 5 · 2016: 8 · 2015: 13 · 2014: 10 · 2013: 13 · 2012: 8
- FWCI
- 8.06
- Type
- journal article
- Language
- en
- Open access
- green
- hal.science
- Licence
- other-oa
- Locations
- Journal of the American Chemical Society (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion, other-oa)
- RiuNet (Universitat Politècnica de València) (submittedVersion, cc-by-nc-nd)
- Topics
- Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Advanced biosensing and bioanalysis techniques
- Keywords
- DNA fluorescence, cyclobutane dimers, base pairing, UVA, DNA photochemistry, charge-transfer states, fluorescence quantum yield, fluorescence lifetime, double-stranded DNA, UV-C radiation, photoproducts
- MeSH terms
- Absorption, Cyclobutanes, DNA, Pyrimidine Dimers, Spectrometry, Fluorescence, Ultraviolet Rays, Dimerization, Base Pairing
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