INFIQC   05475
INSTITUTO DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Excited States of Protonated DNA Bases
Autor/es:
M. BERDAKIN; G. FÉRAUD; C. DEDONDER-LARDEUX; G. GRÉGOIRE; M. BROQUIER; S. SOORKIA; C. JOUVET; G. A. PINO *
Lugar:
Porquerolles
Reunión:
Congreso; Isolated Biomolecules and Biomolecular Interactions; 2014
Resumen:
The very fast relaxation of the excited states
to the ground state in DNA/RNA bases is a necessary process to ensure the photostability
of DNA. This relaxation process is very sensitive to any substitution or
environmental change, and protonation is one of the simplest. We report here
the photofragmentation spectra of the five protonated DNA/RNA bases (uracil is
shown in Fig. 1). Some of them present two systems of bands that were assigned
to different tautomers. Most of the spectra of the protonated bases exhibit
well resolved vibrational structures, with different widths of vibronic bands. For
the bases showing the sharpest bands, the lifetimes were measured with picosecond pump-probe
spectroscopy (Fig. 1) and were found to decrease with the excitation
energy.