Excited-state relation dynamics of a PYP chromophore model in solution: Influence of the thioester group

Pascale Changenet-Barret, Agathe Espagne, Nathalie Katsonis, Sandrine Charier, Jean Bernard Baudin, Ludovic Jullien, Pascal Plaza, Monique M. Martin

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Cis-trans photoisomerization of a photoactive yellow protein chromophore model, the deprotonated trans S-phenyl thio-p-hydroxycinnamate, is studied in aqueous solution by subpicosecond transient absorption and gain spectroscopy. The excited-state deactivation is found to involve the formation, in 1.7 ps, of an intermediate state which decays in 2.8 ps. A persistent bleaching signal is observed at longer times indicating that the excited state not only relaxes to the ground state but also partly forms a stable photoproduct, possibly the cis isomer. This behavior is analogous to that of the native photoactive yellow protein.

Original languageEnglish
Pages (from-to)285-291
Number of pages7
JournalChemical physics letters
Issue number3-4
Publication statusPublished - 15 Oct 2002
Externally publishedYes

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