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  1. Chemical physics
  2. Year: 2008, Volume: 350
  3. Year: 2008, Volume: 350, Issue: 1-3
  4. Ultrafast excited-state dynamics of RNA and DNA C tracts
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Year: 2008, Volume: 350
Year: 2008, Volume: 350, Issue: 1-3
Ultrafast excited-state dynamics of RNA and DNA C tracts
Ultrafast Electronic and Vibrational Dynamics of Stabilized A State Mutants of the Green Fluorescent Protein (GFP): Snipping the Proton Wire
Year: 2008, Volume: 348
Year: 2008, Volume: 347
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Ultrafast excited-state dynamics of RNA and DNA C tracts

Content Provider PubMed Central
Author Cohen, Boiko Larson, Matthew H. Kohler, Bern
Abstract The excited-state dynamics of the RNA homopolymer of cytosine and of the 18-mer (dC)18 were studied by steady-state and time-resolved absorption and emission spectroscopy. At pH 6.8, excitation of poly(rC) by a femtosecond UV pump pulse produces excited states that decay up to one order of magnitude more slowly than the excited states formed in the mononucleotide cytidine 5’-monophosphate under the same conditions. Even slower relaxation is observed for the hemiprotonated, self-associated form of poly(rC), which is stable at acidic pH. Transient absorption and time-resolved fluorescence signals for (dC)18 at pH 6.8 are similar to ones observed for poly(rC) near pH 4, indicating that hemiprotonated structures are found in DNA C tracts at neutral pH. In both systems, there is evidence for two kinds of emitting states with lifetimes of ~100 ps and slightly more than 1 ns. The former states are responsible for the bulk of emission from the hemiprotonated structures. Evidence suggests that slow electronic relaxation in these self-complexes is the result of vertical base stacking. The similar signals from RNA and DNA C tracts suggest a common base-stacked structure, which may be identical with that of i-motif DNA.
Related Links http://dx.doi.org/10.1016/j.chemphys.2008.01.050
Ending Page 174
Page Count 10
Starting Page 165
File Format PDF
ISSN 03010104
Journal Chemical physics
Issue Number 1-3
Volume Number 350
Language English
Publisher Date 2008-06-01
Access Restriction Open
Subject Keyword Physical and Theoretical Chemistry Physics and Astronomy(all) Research in Higher Education
Content Type Text
Resource Type Article
Subject Physics and Astronomy Physical and Theoretical Chemistry
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