Internal conversion and vibronic relaxation from higher excited electronic state of porphyrins: femtosecond fluorescence dynamics studies

Article Abstract:

A new study investigates the fluorescence dynamics of Zn-tetraphenylporphyrin and Zn-diphenylporphyrin derivatives by means of a femtosecond fluorescence up-conversion technique.

Chemistry, Physical and theoretical, Physical chemistry, Porphyrins

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Dynamics and mechanisms of ultrafast fluorescence quenching reactions of flavin chromophores in protein nanospace

Article Abstract:

The excited-state dynamics of "nonfluorescent" flavoproteins are examined, and thus fluorescence quenching mechanisms of these flavoproteins are interpreted as due to the ultrafast electron transfer (ET) to flavin chromophore (F) in the excited electronic state from nearby tryptophan (Trp.NH) or tyrosine (Tyr.OH) residues placed in the protein nanospace (PNS), on the basis of their X-ray structures.

Observations, Proteins, Electron transport, Excited state chemistry, Chemical properties, Atomic properties, Chromophores

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Environmental effects on the femtosecond-picosecond fluorescence dynamics of photoactive yellow protein: chromophores in aqueous solutions and in protein nanospaces modified by site-directed mutagenesis

Article Abstract:

The effect of the protein environment surrounding chromophores on the photoinduced ultrafast twisting of chromophores in photoactive yellow protein (PYP) was investigated by comparing the femtosecond-picosecond fluorescence dynamics of wild type PYP with those of the chromophore in aqueous solution as well as in protein nanospace modified by site-directed mutagenesis. Results indicate that the twisted state formed through the flipping of the thioester linkage of the chromophore was slowed down by modifying the nanospace structure to a slightly looser one.

Fluorescence, Protein engineering, Mutagenesis

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