Competition between energy and proton transfer in ultrafast excited-state dynamics of an oligomeric fluorescent protein red Kaede

Article Abstract:

The relationship between the excited-state dynamics and a quaternary structure of the fluorescent protein Kaede is examined by investigating femtosecond and picoseond time-resolved fluorescence dynamics of the fluorescent protein with a red chromophore. Time-resolved fluorescence measurements clarified that excitation of the neutral form gives rise to the anionic excited state with a time constant of 13 ps at pH 7.5.

Analysis, Excited state chemistry, Energy transformation

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Structural events in the photocycle of green fluorescent proteins

Article Abstract:

The fluorescence and structural properties of the wild type green fluorescent protein (GFP) from Aequorea victoria are investigated extensively. Indication for structural heterogeneity of the chromophore, Glu 22, and the chromophore environment is found in the two parallel proton-transfer reactions and their distance associated ground-and intermediate state vibrations.

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Sensitive circular dichroism marker for the chromophore environment of photoactive yellow protein: Assignment of the 307 and 318 nm bands to the n-> pi* transition of the carbonyl

Article Abstract:

The 318 nm absorption and CD bands of wild-type PYP are assigned to the n->pi* transition of the thioester carbonyl of the chromophore. The 318 nm CD signal is a sensitive marker for the environment of the chromophore carbonyl, which samples various environments and configurations during the photocycle.

Spectra, Circular dichroism

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