Ultrafast excited state dynamics in protonated GWG and GYG tripeptides
Literature Information
G. Grégoire, C. Dedonder-Lardeux, C. Jouvet, C. Desfrançois, J. A. Fayeton
The excited state dynamics of two protonated tripeptides GWG and GYG has been investigated by pump/probe femtosecond measurements on photofragments, to explore the behavior of peptides where the terminal protonated amino group is not directly linked to the aromatic residue. The dynamics observed are short and surprisingly similar to the dynamics observed on the free protonated tryptophan and tyrosine aromatic amino acids. Specific photofragments observed for protonated GWG are related to the formation of a radical species WG°+ after cleavage of the Cα–N bond near the tryptophan residue.
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